LEMON/LEMON-official Changeset - r482:ed54c0d13df0

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Changeset - r482:ed54c0d13df0

« 481:7afc12

547:17cabb »
483:76ec7b »

r482:ed54c0d13df0

Tue, 02 Dec 2008 22:48:28

[Not Reviewed]

0 comments (0 inline)

deba@inf.elte.hu
deba@inf.elte.hu

Thorough redesign of the LP/MIP interface (#44) - Redesigned class structure - Redesigned iterators - Some functions in the basic interface redesigned - More complete setting functions - Ray retrieving functions - Lot of improvements - Cplex common env - CLP macro definition to config.h.in - Update lp.h to also use soplex and clp - Remove default_solver_name - New solverName() function in solvers - Handle exceptions for MipCplex test - Rename tolerance parameter to epsilon - Rename MapIt to CoeffIt - Lot of documentation improvements - Various bugfixes

5 18 4

default

27 files changed:

lemon/bits/solver_bits.h

191

lemon/lp_clp.cc

437

lemon/lp_clp.h

179

configure.ac

lemon/CMakeLists.txt

lemon/Makefile.am

lemon/config.h.in

lemon/lp.h

lemon/lp_base.cc

lemon/lp_base.h

1213

838

lemon/lp_cplex.cc

542

316

lemon/lp_cplex.h

179

lemon/lp_glpk.cc

780

472

lemon/lp_glpk.h

173

lemon/lp_skeleton.cc

135

lemon/lp_skeleton.h

106

lemon/lp_soplex.cc

204

lemon/lp_soplex.h

lemon/bits/lp_id.h

157

lemon/mip_cplex.cc

141

lemon/mip_cplex.h

Changeset was too big and was cut off... Show full diff

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lemon/bits/solver_bits.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2008
 		 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 		 * (Egervary Research Group on Combinatorial Optimization, EGRES).
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#ifndef LEMON_BITS_SOLVER_BITS_H
 		#define LEMON_BITS_SOLVER_BITS_H
 		namespace lemon {
 		  namespace _solver_bits {
 		    class VarIndex {
 		    private:
 		      struct ItemT {
 		        int prev, next;
 		        int index;
 		      };
 		      std::vector<ItemT> items;
 		      int first_item, last_item, first_free_item;
 		      std::vector<int> cross;
 		    public:
 		      VarIndex()
 		        : first_item(-1), last_item(-1), first_free_item(-1) {
+		      }
 		      void clear() {
 		        first_item = -1;
 		        first_free_item = -1;
 		        items.clear();
 		        cross.clear();
+		      }
 		      int addIndex(int idx) {
 		        int n;
 		        if (first_free_item == -1) {
 		          n = items.size();
 		          items.push_back(ItemT());
 		        } else {
 		          n = first_free_item;
 		          first_free_item = items[n].next;
 		          if (first_free_item != -1) {
 		            items[first_free_item].prev = -1;
+		          }
+		        }
 		        items[n].index = idx;
 		        if (static_cast<int>(cross.size()) <= idx) {
 		          cross.resize(idx + 1, -1);
+		        }
 		        cross[idx] = n;
 		        items[n].prev = last_item;
 		        items[n].next = -1;
 		        if (last_item != -1) {
 		          items[last_item].next = n;
 		        } else {
 		          first_item = n;
+		        }
 		        last_item = n;
 		        return n;
+		      }
 		      int addIndex(int idx, int n) {
 		        while (n >= static_cast<int>(items.size())) {
 		          items.push_back(ItemT());
 		          items.back().prev = -1;
 		          items.back().next = first_free_item;
 		          if (first_free_item != -1) {
 		            items[first_free_item].prev = items.size() - 1;
+		          }
 		          first_free_item = items.size() - 1;
+		        }
 		        if (items[n].next != -1) {
 		          items[items[n].next].prev = items[n].prev;
+		        }
 		        if (items[n].prev != -1) {
 		          items[items[n].prev].next = items[n].next;
 		        } else {
 		          first_free_item = items[n].next;
+		        }
 		        items[n].index = idx;
 		        if (static_cast<int>(cross.size()) <= idx) {
 		          cross.resize(idx + 1, -1);
+		        }
 		        cross[idx] = n;
 		        items[n].prev = last_item;
 		        items[n].next = -1;
 		        if (last_item != -1) {
 		          items[last_item].next = n;
 		        } else {
 		          first_item = n;
+		        }
 		        last_item = n;
 		        return n;
+		      }
 		      void eraseIndex(int idx) {
 		        int n = cross[idx];
 		        if (items[n].prev != -1) {
 		          items[items[n].prev].next = items[n].next;
 		        } else {
 		          first_item = items[n].next;
+		        }
 		        if (items[n].next != -1) {
 		          items[items[n].next].prev = items[n].prev;
 		        } else {
 		          last_item = items[n].prev;
+		        }
 		        if (first_free_item != -1) {
 		          items[first_free_item].prev = n;
+		        }
 		        items[n].next = first_free_item;
 		        items[n].prev = -1;
 		        first_free_item = n;
 		        while (!cross.empty() && cross.back() == -1) {
 		          cross.pop_back();
+		        }
+		      }
 		      int maxIndex() const {
 		        return cross.size() - 1;
+		      }
 		      void shiftIndices(int idx) {
 		        for (int i = idx + 1; i < static_cast<int>(cross.size()); ++i) {
 		          cross[i - 1] = cross[i];
 		          if (cross[i] != -1) {
 		            --items[cross[i]].index;
+		          }
+		        }
 		        cross.back() = -1;
 		        cross.pop_back();
 		        while (!cross.empty() && cross.back() == -1) {
 		          cross.pop_back();
+		        }
+		      }
 		      void relocateIndex(int idx, int jdx) {
 		        cross[idx] = cross[jdx];
 		        items[cross[jdx]].index = idx;
 		        cross[jdx] = -1;
 		        while (!cross.empty() && cross.back() == -1) {
 		          cross.pop_back();
+		        }
+		      }
 		      int operator[](int idx) const {
 		        return cross[idx];
+		      }
 		      int operator()(int fdx) const {
 		        return items[fdx].index;
+		      }
 		      void firstItem(int& fdx) const {
 		        fdx = first_item;
+		      }
 		      void nextItem(int& fdx) const {
 		        fdx = items[fdx].next;
+		      }
 		    };
+		  }
+		}
 		#endif

lemon/lp_clp.cc

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2008
 		 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 		 * (Egervary Research Group on Combinatorial Optimization, EGRES).
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#include <lemon/lp_clp.h>
 		#include <coin/ClpSimplex.hpp>
 		namespace lemon {
 		  LpClp::LpClp() {
 		    _prob = new ClpSimplex();
 		    _init_temporals();
 		    messageLevel(MESSAGE_NO_OUTPUT);
+		  }
 		  LpClp::LpClp(const LpClp& other) {
 		    _prob = new ClpSimplex(*other._prob);
 		    rows = other.rows;
 		    cols = other.cols;
 		    _init_temporals();
 		    messageLevel(MESSAGE_NO_OUTPUT);
+		  }
 		  LpClp::~LpClp() {
 		    delete _prob;
 		    _clear_temporals();
+		  }
 		  void LpClp::_init_temporals() {
 		    _primal_ray = 0;
 		    _dual_ray = 0;
+		  }
 		  void LpClp::_clear_temporals() {
 		    if (_primal_ray) {
 		      delete[] _primal_ray;
 		      _primal_ray = 0;
+		    }
 		    if (_dual_ray) {
 		      delete[] _dual_ray;
 		      _dual_ray = 0;
+		    }
+		  }
 		  LpClp* LpClp::_newSolver() const {
 		    LpClp* newlp = new LpClp;
 		    return newlp;
+		  }
 		  LpClp* LpClp::_cloneSolver() const {
 		    LpClp* copylp = new LpClp(*this);
 		    return copylp;
+		  }
 		  const char* LpClp::_solverName() const { return "LpClp"; }
 		  int LpClp::_addCol() {
 		    _prob->addColumn(0, 0, 0, -COIN_DBL_MAX, COIN_DBL_MAX, 0.0);
 		    return _prob->numberColumns() - 1;
+		  }
 		  int LpClp::_addRow() {
 		    _prob->addRow(0, 0, 0, -COIN_DBL_MAX, COIN_DBL_MAX);
 		    return _prob->numberRows() - 1;
+		  }
 		  void LpClp::_eraseCol(int c) {
 		    _col_names_ref.erase(_prob->getColumnName(c));
 		    _prob->deleteColumns(1, &c);
+		  }
 		  void LpClp::_eraseRow(int r) {
 		    _row_names_ref.erase(_prob->getRowName(r));
 		    _prob->deleteRows(1, &r);
+		  }
 		  void LpClp::_eraseColId(int i) {
 		    cols.eraseIndex(i);
 		    cols.shiftIndices(i);
+		  }
 		  void LpClp::_eraseRowId(int i) {
 		    rows.eraseIndex(i);
 		    rows.shiftIndices(i);
+		  }
 		  void LpClp::_getColName(int c, std::string& name) const {
 		    name = _prob->getColumnName(c);
+		  }
 		  void LpClp::_setColName(int c, const std::string& name) {
 		    _prob->setColumnName(c, const_cast<std::string&>(name));
 		    _col_names_ref[name] = c;
+		  }
 		  int LpClp::_colByName(const std::string& name) const {
 		    std::map<std::string, int>::const_iterator it = _col_names_ref.find(name);
 		    return it != _col_names_ref.end() ? it->second : -1;
+		  }
 		  void LpClp::_getRowName(int r, std::string& name) const {
 		    name = _prob->getRowName(r);
+		  }
 		  void LpClp::_setRowName(int r, const std::string& name) {
 		    _prob->setRowName(r, const_cast<std::string&>(name));
 		    _row_names_ref[name] = r;
+		  }
 		  int LpClp::_rowByName(const std::string& name) const {
 		    std::map<std::string, int>::const_iterator it = _row_names_ref.find(name);
 		    return it != _row_names_ref.end() ? it->second : -1;
+		  }
 		  void LpClp::_setRowCoeffs(int ix, ExprIterator b, ExprIterator e) {
 		    std::map<int, Value> coeffs;
 		    int n = _prob->clpMatrix()->getNumCols();
 		    const int* indices = _prob->clpMatrix()->getIndices();
 		    const double* elements = _prob->clpMatrix()->getElements();
 		    for (int i = 0; i < n; ++i) {
 		      CoinBigIndex begin = _prob->clpMatrix()->getVectorStarts()[i];
 		      CoinBigIndex end = begin + _prob->clpMatrix()->getVectorLengths()[i];
 		      const int* it = std::lower_bound(indices + begin, indices + end, ix);
 		      if (it != indices + end && *it == ix && elements[it - indices] != 0.0) {
 		        coeffs[i] = 0.0;
+		      }
+		    }
 		    for (ExprIterator it = b; it != e; ++it) {
 		      coeffs[it->first] = it->second;
+		    }
 		    for (std::map<int, Value>::iterator it = coeffs.begin();
 		         it != coeffs.end(); ++it) {
 		      _prob->modifyCoefficient(ix, it->first, it->second);
+		    }
+		  }
 		  void LpClp::_getRowCoeffs(int ix, InsertIterator b) const {
 		    int n = _prob->clpMatrix()->getNumCols();
 		    const int* indices = _prob->clpMatrix()->getIndices();
 		    const double* elements = _prob->clpMatrix()->getElements();
 		    for (int i = 0; i < n; ++i) {
 		      CoinBigIndex begin = _prob->clpMatrix()->getVectorStarts()[i];
 		      CoinBigIndex end = begin + _prob->clpMatrix()->getVectorLengths()[i];
 		      const int* it = std::lower_bound(indices + begin, indices + end, ix);
 		      if (it != indices + end && *it == ix) {
 		        *b = std::make_pair(i, elements[it - indices]);
+		      }
+		    }
+		  }
 		  void LpClp::_setColCoeffs(int ix, ExprIterator b, ExprIterator e) {
 		    std::map<int, Value> coeffs;
 		    CoinBigIndex begin = _prob->clpMatrix()->getVectorStarts()[ix];
 		    CoinBigIndex end = begin + _prob->clpMatrix()->getVectorLengths()[ix];
 		    const int* indices = _prob->clpMatrix()->getIndices();
 		    const double* elements = _prob->clpMatrix()->getElements();
 		    for (CoinBigIndex i = begin; i != end; ++i) {
 		      if (elements[i] != 0.0) {
 		        coeffs[indices[i]] = 0.0;
+		      }
+		    }
 		    for (ExprIterator it = b; it != e; ++it) {
 		      coeffs[it->first] = it->second;
+		    }
 		    for (std::map<int, Value>::iterator it = coeffs.begin();
 		         it != coeffs.end(); ++it) {
 		      _prob->modifyCoefficient(it->first, ix, it->second);
+		    }
+		  }
 		  void LpClp::_getColCoeffs(int ix, InsertIterator b) const {
 		    CoinBigIndex begin = _prob->clpMatrix()->getVectorStarts()[ix];
 		    CoinBigIndex end = begin + _prob->clpMatrix()->getVectorLengths()[ix];
 		    const int* indices = _prob->clpMatrix()->getIndices();
 		    const double* elements = _prob->clpMatrix()->getElements();
 		    for (CoinBigIndex i = begin; i != end; ++i) {
 		      *b = std::make_pair(indices[i], elements[i]);
 		      ++b;
+		    }
+		  }
 		  void LpClp::_setCoeff(int ix, int jx, Value value) {
 		    _prob->modifyCoefficient(ix, jx, value);
+		  }
 		  LpClp::Value LpClp::_getCoeff(int ix, int jx) const {
 		    CoinBigIndex begin = _prob->clpMatrix()->getVectorStarts()[ix];
 		    CoinBigIndex end = begin + _prob->clpMatrix()->getVectorLengths()[ix];
 		    const int* indices = _prob->clpMatrix()->getIndices();
 		    const double* elements = _prob->clpMatrix()->getElements();
 		    const int* it = std::lower_bound(indices + begin, indices + end, jx);
 		    if (it != indices + end && *it == jx) {
 		      return elements[it - indices];
 		    } else {
 		      return 0.0;
+		    }
+		  }
 		  void LpClp::_setColLowerBound(int i, Value lo) {
 		    _prob->setColumnLower(i, lo == - INF ? - COIN_DBL_MAX : lo);
+		  }
 		  LpClp::Value LpClp::_getColLowerBound(int i) const {
 		    double val = _prob->getColLower()[i];
 		    return val == - COIN_DBL_MAX ? - INF : val;
+		  }
 		  void LpClp::_setColUpperBound(int i, Value up) {
 		    _prob->setColumnUpper(i, up == INF ? COIN_DBL_MAX : up);
+		  }
 		  LpClp::Value LpClp::_getColUpperBound(int i) const {
 		    double val = _prob->getColUpper()[i];
 		    return val == COIN_DBL_MAX ? INF : val;
+		  }
 		  void LpClp::_setRowLowerBound(int i, Value lo) {
 		    _prob->setRowLower(i, lo == - INF ? - COIN_DBL_MAX : lo);
+		  }
 		  LpClp::Value LpClp::_getRowLowerBound(int i) const {
 		    double val = _prob->getRowLower()[i];
 		    return val == - COIN_DBL_MAX ? - INF : val;
+		  }
 		  void LpClp::_setRowUpperBound(int i, Value up) {
 		    _prob->setRowUpper(i, up == INF ? COIN_DBL_MAX : up);
+		  }
 		  LpClp::Value LpClp::_getRowUpperBound(int i) const {
 		    double val = _prob->getRowUpper()[i];
 		    return val == COIN_DBL_MAX ? INF : val;
+		  }
 		  void LpClp::_setObjCoeffs(ExprIterator b, ExprIterator e) {
 		    int num = _prob->clpMatrix()->getNumCols();
 		    for (int i = 0; i < num; ++i) {
 		      _prob->setObjectiveCoefficient(i, 0.0);
+		    }
 		    for (ExprIterator it = b; it != e; ++it) {
 		      _prob->setObjectiveCoefficient(it->first, it->second);
+		    }
+		  }
 		  void LpClp::_getObjCoeffs(InsertIterator b) const {
 		    int num = _prob->clpMatrix()->getNumCols();
 		    for (int i = 0; i < num; ++i) {
 		      Value coef = _prob->getObjCoefficients()[i];
 		      if (coef != 0.0) {
 		        *b = std::make_pair(i, coef);
 		        ++b;
+		      }
+		    }
+		  }
 		  void LpClp::_setObjCoeff(int i, Value obj_coef) {
 		    _prob->setObjectiveCoefficient(i, obj_coef);
+		  }
 		  LpClp::Value LpClp::_getObjCoeff(int i) const {
 		    return _prob->getObjCoefficients()[i];
+		  }
 		  LpClp::SolveExitStatus LpClp::_solve() {
 		    return _prob->primal() >= 0 ? SOLVED : UNSOLVED;
+		  }
 		  LpClp::SolveExitStatus LpClp::solvePrimal() {
 		    return _prob->primal() >= 0 ? SOLVED : UNSOLVED;
+		  }
 		  LpClp::SolveExitStatus LpClp::solveDual() {
 		    return _prob->dual() >= 0 ? SOLVED : UNSOLVED;
+		  }
 		  LpClp::SolveExitStatus LpClp::solveBarrier() {
 		    return _prob->barrier() >= 0 ? SOLVED : UNSOLVED;
+		  }
 		  LpClp::Value LpClp::_getPrimal(int i) const {
 		    return _prob->primalColumnSolution()[i];
+		  }
 		  LpClp::Value LpClp::_getPrimalValue() const {
 		    return _prob->objectiveValue();
+		  }
 		  LpClp::Value LpClp::_getDual(int i) const {
 		    return _prob->dualRowSolution()[i];
+		  }
 		  LpClp::Value LpClp::_getPrimalRay(int i) const {
 		    if (!_primal_ray) {
 		      _primal_ray = _prob->unboundedRay();
 		      LEMON_ASSERT(_primal_ray != 0, "Primal ray is not provided");
+		    }
 		    return _primal_ray[i];
+		  }
 		  LpClp::Value LpClp::_getDualRay(int i) const {
 		    if (!_dual_ray) {
 		      _dual_ray = _prob->infeasibilityRay();
 		      LEMON_ASSERT(_dual_ray != 0, "Dual ray is not provided");
+		    }
 		    return _dual_ray[i];
+		  }
 		  LpClp::VarStatus LpClp::_getColStatus(int i) const {
 		    switch (_prob->getColumnStatus(i)) {
 		    case ClpSimplex::basic:
 		      return BASIC;
 		    case ClpSimplex::isFree:
 		      return FREE;
 		    case ClpSimplex::atUpperBound:
 		      return UPPER;
 		    case ClpSimplex::atLowerBound:
 		      return LOWER;
 		    case ClpSimplex::isFixed:
 		      return FIXED;
 		    case ClpSimplex::superBasic:
 		      return FREE;
 		    default:
 		      LEMON_ASSERT(false, "Wrong column status");
 		      return VarStatus();
+		    }
+		  }
 		  LpClp::VarStatus LpClp::_getRowStatus(int i) const {
 		    switch (_prob->getColumnStatus(i)) {
 		    case ClpSimplex::basic:
 		      return BASIC;
 		    case ClpSimplex::isFree:
 		      return FREE;
 		    case ClpSimplex::atUpperBound:
 		      return UPPER;
 		    case ClpSimplex::atLowerBound:
 		      return LOWER;
 		    case ClpSimplex::isFixed:
 		      return FIXED;
 		    case ClpSimplex::superBasic:
 		      return FREE;
 		    default:
 		      LEMON_ASSERT(false, "Wrong row status");
 		      return VarStatus();
+		    }
+		  }
 		  LpClp::ProblemType LpClp::_getPrimalType() const {
 		    if (_prob->isProvenOptimal()) {
 		      return OPTIMAL;
 		    } else if (_prob->isProvenPrimalInfeasible()) {
 		      return INFEASIBLE;
 		    } else if (_prob->isProvenDualInfeasible()) {
 		      return UNBOUNDED;
 		    } else {
 		      return UNDEFINED;
+		    }
+		  }
 		  LpClp::ProblemType LpClp::_getDualType() const {
 		    if (_prob->isProvenOptimal()) {
 		      return OPTIMAL;
 		    } else if (_prob->isProvenDualInfeasible()) {
 		      return INFEASIBLE;
 		    } else if (_prob->isProvenPrimalInfeasible()) {
 		      return INFEASIBLE;
 		    } else {
 		      return UNDEFINED;
+		    }
+		  }
 		  void LpClp::_setSense(LpClp::Sense sense) {
 		    switch (sense) {
 		    case MIN:
 		      _prob->setOptimizationDirection(1);
 		      break;
 		    case MAX:
 		      _prob->setOptimizationDirection(-1);
 		      break;
+		    }
+		  }
 		  LpClp::Sense LpClp::_getSense() const {
 		    double dir = _prob->optimizationDirection();
 		    if (dir > 0.0) {
 		      return MIN;
 		    } else {
 		      return MAX;
+		    }
+		  }
 		  void LpClp::_clear() {
 		    delete _prob;
 		    _prob = new ClpSimplex();
 		    rows.clear();
 		    cols.clear();
 		    _col_names_ref.clear();
 		    _clear_temporals();
+		  }
 		  void LpClp::messageLevel(MessageLevel m) {
 		    _prob->setLogLevel(static_cast<int>(m));
+		  }
 		} //END OF NAMESPACE LEMON

lemon/lp_clp.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2008
 		 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 		 * (Egervary Research Group on Combinatorial Optimization, EGRES).
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#ifndef LEMON_LP_CLP_H
 		#define LEMON_LP_CLP_H
 		///\file
 		///\brief Header of the LEMON-CLP lp solver interface.
 		#include <vector>
 		#include <string>
 		#include <lemon/lp_base.h>
 		class ClpSimplex;
 		namespace lemon {
 		  /// \ingroup lp_group
 		  ///
 		  /// \brief Interface for the CLP solver
 		  ///
 		  /// This class implements an interface for the Clp LP solver.  The
 		  /// Clp library is an object oriented lp solver library developed at
 		  /// the IBM. The CLP is part of the COIN-OR package and it can be
 		  /// used with Common Public License.
 		  class LpClp : public LpSolver {
 		  protected:
 		    ClpSimplex* _prob;
 		    std::map<std::string, int> _col_names_ref;
 		    std::map<std::string, int> _row_names_ref;
 		  public:
 		    /// \e
 		    LpClp();
 		    /// \e
 		    LpClp(const LpClp&);
 		    /// \e
 		    ~LpClp();
 		  protected:
 		    mutable double* _primal_ray;
 		    mutable double* _dual_ray;
 		    void _init_temporals();
 		    void _clear_temporals();
 		  protected:
 		    virtual LpClp* _newSolver() const;
 		    virtual LpClp* _cloneSolver() const;
 		    virtual const char* _solverName() const;
 		    virtual int _addCol();
 		    virtual int _addRow();
 		    virtual void _eraseCol(int i);
 		    virtual void _eraseRow(int i);
 		    virtual void _eraseColId(int i);
 		    virtual void _eraseRowId(int i);
 		    virtual void _getColName(int col, std::string& name) const;
 		    virtual void _setColName(int col, const std::string& name);
 		    virtual int _colByName(const std::string& name) const;
 		    virtual void _getRowName(int row, std::string& name) const;
 		    virtual void _setRowName(int row, const std::string& name);
 		    virtual int _rowByName(const std::string& name) const;
 		    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
 		    virtual void _getRowCoeffs(int i, InsertIterator b) const;
 		    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
 		    virtual void _getColCoeffs(int i, InsertIterator b) const;
 		    virtual void _setCoeff(int row, int col, Value value);
 		    virtual Value _getCoeff(int row, int col) const;
 		    virtual void _setColLowerBound(int i, Value value);
 		    virtual Value _getColLowerBound(int i) const;
 		    virtual void _setColUpperBound(int i, Value value);
 		    virtual Value _getColUpperBound(int i) const;
 		    virtual void _setRowLowerBound(int i, Value value);
 		    virtual Value _getRowLowerBound(int i) const;
 		    virtual void _setRowUpperBound(int i, Value value);
 		    virtual Value _getRowUpperBound(int i) const;
 		    virtual void _setObjCoeffs(ExprIterator, ExprIterator);
 		    virtual void _getObjCoeffs(InsertIterator) const;
 		    virtual void _setObjCoeff(int i, Value obj_coef);
 		    virtual Value _getObjCoeff(int i) const;
 		    virtual void _setSense(Sense sense);
 		    virtual Sense _getSense() const;
 		    virtual SolveExitStatus _solve();
 		    virtual Value _getPrimal(int i) const;
 		    virtual Value _getDual(int i) const;
 		    virtual Value _getPrimalValue() const;
 		    virtual Value _getPrimalRay(int i) const;
 		    virtual Value _getDualRay(int i) const;
 		    virtual VarStatus _getColStatus(int i) const;
 		    virtual VarStatus _getRowStatus(int i) const;
 		    virtual ProblemType _getPrimalType() const;
 		    virtual ProblemType _getDualType() const;
 		    virtual void _clear();
 		  public:
 		    ///Solves LP with primal simplex method.
 		    SolveExitStatus solvePrimal();
 		    ///Solves LP with dual simplex method.
 		    SolveExitStatus solveDual();
 		    ///Solves LP with barrier method.
 		    SolveExitStatus solveBarrier();
 		    ///Returns the constraint identifier understood by CLP.
 		    int clpRow(Row r) const { return rows(id(r)); }
 		    ///Returns the variable identifier understood by CLP.
 		    int clpCol(Col c) const { return cols(id(c)); }
 		    ///Enum for \c messageLevel() parameter
 		    enum MessageLevel {
 		      /// no output (default value)
 		      MESSAGE_NO_OUTPUT = 0,
 		      /// print final solution
 		      MESSAGE_FINAL_SOLUTION = 1,
 		      /// print factorization
 		      MESSAGE_FACTORIZATION = 2,
 		      /// normal output
 		      MESSAGE_NORMAL_OUTPUT = 3,
 		      /// verbose output
 		      MESSAGE_VERBOSE_OUTPUT = 4
 		    };
 		    ///Set the verbosity of the messages
 		    ///Set the verbosity of the messages
 		    ///
 		    ///\param m is the level of the messages output by the solver routines.
 		    void messageLevel(MessageLevel m);
 		  };
 		} //END OF NAMESPACE LEMON
 		#endif //LEMON_LP_CLP_H

configure.ac

Show inline comments

@@ -44,24 +44,25 @@
 		fi
 		dnl Set custom compiler flags when using g++.
 		if test "$GXX" = yes -a "$ICC" = no; then
 		  WARNINGCXXFLAGS="-Wall -W -Wall -W -Wunused -Wformat=2 -Wctor-dtor-privacy -Wnon-virtual-dtor -Wno-char-subscripts -Wwrite-strings -Wno-char-subscripts -Wreturn-type -Wcast-qual -Wcast-align -Wsign-promo -Woverloaded-virtual -ansi -fno-strict-aliasing -Wold-style-cast -Wno-unknown-pragmas"
 		fi
 		AC_SUBST([WARNINGCXXFLAGS])
 		dnl Checks for libraries.
 		LX_CHECK_GLPK
 		LX_CHECK_CPLEX
 		LX_CHECK_SOPLEX
 		LX_CHECK_CLP
 		AM_CONDITIONAL([HAVE_LP], [test x"$lx_lp_found" = x"yes"])
 		AM_CONDITIONAL([HAVE_MIP], [test x"$lx_mip_found" = x"yes"])
 		dnl Disable/enable building the demo programs.
 		AC_ARG_ENABLE([demo],
 		AS_HELP_STRING([--enable-demo], [build the demo programs])
 		AS_HELP_STRING([--disable-demo], [do not build the demo programs @<:@default@:>@]),
 		              [], [enable_demo=no])
 		AC_MSG_CHECKING([whether to build the demo programs])
 		if test x"$enable_demo" != x"no"; then
 		  AC_MSG_RESULT([yes])
@@ -111,24 +112,25 @@
 		echo
 		echo '****************************** SUMMARY ******************************'
 		echo
 		echo Package version............... : $PACKAGE-$VERSION
 		echo
 		echo C++ compiler.................. : $CXX
 		echo C++ compiles flags............ : $WARNINGCXXFLAGS $CXXFLAGS
 		echo
 		echo GLPK support.................. : $lx_glpk_found
 		echo CPLEX support................. : $lx_cplex_found
 		echo SOPLEX support................ : $lx_soplex_found
 		echo CLP support................... : $lx_clp_found
 		echo
 		echo Build demo programs........... : $enable_demo
 		echo Build additional tools........ : $enable_tools
 		echo
 		echo The packace will be installed in
 		echo -n '  '
 		echo $prefix.
 		echo
 		echo '*********************************************************************'
 		echo
 		echo Configure complete, now type \'make\' and then \'make install\'.

lemon/CMakeLists.txt

Show inline comments

 		INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR})
 		ADD_LIBRARY(lemon
 		  arg_parser.cc
 		  base.cc
 		  color.cc
 		  lp_base.cc
 		  lp_skeleton.cc
 		  lp_utils.cc
 		  random.cc)
 		INSTALL(
 		  TARGETS lemon
 		  ARCHIVE DESTINATION lib
 		  COMPONENT library)
 		INSTALL(
 		  DIRECTORY . bits concepts
 		  DESTINATION include/lemon
 		  COMPONENT headers
 		  FILES_MATCHING PATTERN "*.h")

lemon/Makefile.am

Show inline comments

@@ -9,43 +9,49 @@
 		lemon_libemon_la_SOURCES = \
 			lemon/arg_parser.cc \
 			lemon/base.cc \
 			lemon/color.cc \
 			lemon/lp_base.cc \
 			lemon/lp_skeleton.cc \
 			lemon/random.cc
 		lemon_libemon_la_CXXFLAGS = \
 			$(GLPK_CFLAGS) \
 			$(CPLEX_CFLAGS) \
 			$(SOPLEX_CXXFLAGS)
+			$(SOPLEX_CXXFLAGS) \
 			$(CLP_CXXFLAGS)
 		lemon_libemon_la_LDFLAGS = \
 			$(GLPK_LIBS) \
 			$(CPLEX_LIBS) \
 			$(SOPLEX_LIBS)
+			$(SOPLEX_LIBS) \
 			$(CLP_LIBS)
 		if HAVE_GLPK
-		lemon_libemon_la_SOURCES += lemon/lp_glpk.cc lemon/mip_glpk.cc
 		lemon_libemon_la_SOURCES += lemon/lp_glpk.cc
 		endif
 		if HAVE_CPLEX
-		lemon_libemon_la_SOURCES += lemon/lp_cplex.cc lemon/mip_cplex.cc
 		lemon_libemon_la_SOURCES += lemon/lp_cplex.cc
 		endif
 		if HAVE_SOPLEX
 		lemon_libemon_la_SOURCES += lemon/lp_soplex.cc
 		endif
 		if HAVE_CLP
 		lemon_libemon_la_SOURCES += lemon/lp_clp.cc
 		endif
 		lemon_HEADERS += \
 			lemon/adaptors.h \
 			lemon/arg_parser.h \
 			lemon/assert.h \
 			lemon/bfs.h \
 			lemon/bin_heap.h \
 			lemon/circulation.h \
 			lemon/color.h \
 			lemon/concept_check.h \
 			lemon/counter.h \
 			lemon/core.h \
 			lemon/dfs.h \
@@ -56,55 +62,55 @@
 			lemon/error.h \
 			lemon/full_graph.h \
 			lemon/graph_to_eps.h \
 			lemon/grid_graph.h \
 			lemon/hypercube_graph.h \
 			lemon/kruskal.h \
 			lemon/hao_orlin.h \
 			lemon/lgf_reader.h \
 			lemon/lgf_writer.h \
 			lemon/list_graph.h \
 			lemon/lp.h \
 			lemon/lp_base.h \
 			lemon/lp_clp.h \
 			lemon/lp_cplex.h \
 			lemon/lp_glpk.h \
 			lemon/lp_skeleton.h \
 			lemon/lp_soplex.h \
 			lemon/mip_cplex.h \
 			lemon/mip_glpk.h \
 			lemon/list_graph.h \
 			lemon/maps.h \
 			lemon/math.h \
 			lemon/max_matching.h \
 			lemon/nauty_reader.h \
 			lemon/path.h \
 			lemon/preflow.h \
 			lemon/radix_sort.h \
 			lemon/random.h \
 			lemon/smart_graph.h \
 			lemon/suurballe.h \
 			lemon/time_measure.h \
 			lemon/tolerance.h \
 			lemon/unionfind.h
 		bits_HEADERS += \
 			lemon/bits/alteration_notifier.h \
 			lemon/bits/array_map.h \
 			lemon/bits/base_extender.h \
 			lemon/bits/bezier.h \
 			lemon/bits/default_map.h \
 			lemon/bits/enable_if.h \
 			lemon/bits/graph_adaptor_extender.h \
 			lemon/bits/graph_extender.h \
 			lemon/bits/lp_id.h \
 			lemon/bits/map_extender.h \
 			lemon/bits/path_dump.h \
 			lemon/bits/solver_bits.h \
 			lemon/bits/traits.h \
 			lemon/bits/variant.h \
 			lemon/bits/vector_map.h
 		concept_HEADERS += \
 			lemon/concepts/digraph.h \
 			lemon/concepts/graph.h \
 			lemon/concepts/graph_components.h \
 			lemon/concepts/heap.h \
 			lemon/concepts/maps.h \
 			lemon/concepts/path.h

lemon/config.h.in

Show inline comments

@@ -2,13 +2,16 @@
 		#undef HAVE_LP
 		/* Define to 1 if you have any MIP solver. */
 		#undef HAVE_MIP
 		/* Define to 1 if you have CPLEX. */
 		#undef HAVE_CPLEX
 		/* Define to 1 if you have GLPK. */
 		#undef HAVE_GLPK
 		/* Define to 1 if you have SOPLEX */
 		#undef HAVE_SOPLEX
 		 No newline at end of file
 		#undef HAVE_SOPLEX
 		/* Define to 1 if you have CLP */
 		#undef HAVE_CLP

lemon/lp.h

Show inline comments

@@ -15,76 +15,79 @@
 		 * purpose.
+		 *
 		 */
 		#ifndef LEMON_LP_H
 		#define LEMON_LP_H
 		#include<lemon/config.h>
 		#ifdef HAVE_GLPK
 		#include <lemon/lp_glpk.h>
 		#include <lemon/mip_glpk.h>
 		#elif HAVE_CPLEX
 		#include <lemon/lp_cplex.h>
 		#include <lemon/mip_cplex.h>
 		#elif HAVE_SOPLEX
 		#include <lemon/lp_soplex.h>
 		#elif HAVE_CLP
 		#include <lemon/lp_clp.h>
 		#endif
 		///\file
 		///\brief Defines a default LP solver
 		///\ingroup lp_group
 		namespace lemon {
 		#ifdef DOXYGEN
 		  ///The default LP solver identifier
 		  ///The default LP solver identifier.
 		  ///\ingroup lp_group
 		  ///
 		  ///Currently, the possible values are \c GLPK or \c CPLEX
 		#define DEFAULT_LP SOLVER
 		  ///Currently, the possible values are \c LP_GLPK, \c LP_CPLEX, \c
 		  ///LP_SOPLEX or \c LP_CLP
 		#define LEMON_DEFAULT_LP SOLVER
 		  ///The default LP solver
 		  ///The default LP solver.
 		  ///\ingroup lp_group
 		  ///
-		  ///Currently, it is either \c LpGlpk or \c LpCplex
+		  ///Currently, it is either \c LpGlpk, \c LpCplex, \c LpSoplex or \c LpClp
 		  typedef LpGlpk Lp;
 		  ///The default LP solver identifier string
-		  ///The default LP solver identifier string.
+		  ///The default MIP solver identifier
 		  ///The default MIP solver identifier.
 		  ///\ingroup lp_group
 		  ///
 		  ///Currently, the possible values are "GLPK" or "CPLEX"
 		  const char default_solver_name[]="SOLVER";
 		  ///Currently, the possible values are \c MIP_GLPK or \c MIP_CPLEX
 		#define LEMON_DEFAULT_MIP SOLVER
 		  ///The default MIP solver.
 		  ///The default ILP solver.
-		  ///The default ILP solver.
+		  ///The default MIP solver.
 		  ///\ingroup lp_group
 		  ///
-		  ///Currently, it is either \c LpGlpk or \c LpCplex
+		  ///Currently, it is either \c MipGlpk or \c MipCplex
 		  typedef MipGlpk Mip;
 		#else
 		#ifdef HAVE_GLPK
-		#define DEFAULT_LP GLPK
+		# define LEMON_DEFAULT_LP LP_GLPK
 		  typedef LpGlpk Lp;
 		# define LEMON_DEFAULT_MIP MIP_GLPK
 		  typedef MipGlpk Mip;
 		  const char default_solver_name[]="GLPK";
 		#elif HAVE_CPLEX
-		#define DEFAULT_LP CPLEX
+		# define LEMON_DEFAULT_LP LP_CPLEX
 		  typedef LpCplex Lp;
 		# define LEMON_DEFAULT_MIP MIP_CPLEX
 		  typedef MipCplex Mip;
 		  const char default_solver_name[]="CPLEX";
 		#elif HAVE_SOPLEX
-		#define DEFAULT_LP SOPLEX
+		# define DEFAULT_LP LP_SOPLEX
 		  typedef LpSoplex Lp;
-		  const char default_solver_name[]="SOPLEX";
+		#elif HAVE_CLP
 		# define DEFAULT_LP LP_CLP
 		  typedef LpClp Lp;
 		#endif
 		#endif
 		} //namespace lemon
 		#endif //LEMON_LP_H

lemon/lp_base.cc

Show inline comments

@@ -13,23 +13,16 @@
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		///\file
 		///\brief The implementation of the LP solver interface.
 		#include <lemon/lp_base.h>
 		namespace lemon {
 		  const LpSolverBase::Value
 		  LpSolverBase::INF = std::numeric_limits<Value>::infinity();
 		  const LpSolverBase::Value
 		  LpSolverBase::NaN = std::numeric_limits<Value>::quiet_NaN();
 		//   const LpSolverBase::Constr::Value
 		//   LpSolverBase::Constr::INF = std::numeric_limits<Value>::infinity();
 		//   const LpSolverBase::Constr::Value
-		//   LpSolverBase::Constr::NaN = std::numeric_limits<Value>::quiet_NaN();
+		  const LpBase::Value LpBase::INF = std::numeric_limits<Value>::infinity();
 		  const LpBase::Value LpBase::NaN = std::numeric_limits<Value>::quiet_NaN();
 		} //namespace lemon

lemon/lp_base.h

Show inline comments

@@ -16,368 +16,519 @@
+		 *
 		 */
 		#ifndef LEMON_LP_BASE_H
 		#define LEMON_LP_BASE_H
 		#include<iostream>
 		#include<vector>
 		#include<map>
 		#include<limits>
 		#include<lemon/math.h>
 		#include<lemon/error.h>
 		#include<lemon/assert.h>
 		#include<lemon/core.h>
-		#include<lemon/bits/lp_id.h>
+		#include<lemon/bits/solver_bits.h>
 		///\file
 		///\brief The interface of the LP solver interface.
 		///\ingroup lp_group
 		namespace lemon {
-		  /// Function to decide whether a floating point value is finite or not.
+		  ///Common base class for LP and MIP solvers
 		  /// Retruns true if the argument is not infinity, minus infinity or NaN.
 		  /// It does the same as the isfinite() function defined by C99.
 		  template <typename T>
 		  bool isFinite(T value)
+		  {
 		    typedef std::numeric_limits<T> Lim;
 		    if ((Lim::has_infinity && (value == Lim::infinity() || value ==
 		                               -Lim::infinity())) ||
 		        ((Lim::has_quiet_NaN || Lim::has_signaling_NaN) && value != value))
+		    {
 		      return false;
+		    }
 		    return true;
+		  }
 		  ///Common base class for LP solvers
 		  ///\todo Much more docs
 		  ///Usually this class is not used directly, please use one of the concrete
 		  ///implementations of the solver interface.
 		  ///\ingroup lp_group
-		  class LpSolverBase {
+		  class LpBase {
 		  protected:
 		    _lp_bits::LpId rows;
 		    _lp_bits::LpId cols;
 		    _solver_bits::VarIndex rows;
 		    _solver_bits::VarIndex cols;
 		  public:
 		    ///Possible outcomes of an LP solving procedure
 		    enum SolveExitStatus {
 		      ///This means that the problem has been successfully solved: either
 		      ///an optimal solution has been found or infeasibility/unboundedness
 		      ///has been proved.
 		      SOLVED = 0,
 		      ///Any other case (including the case when some user specified
 		      ///limit has been exceeded)
 		      UNSOLVED = 1
 		    };
 		      ///\e
 		    enum SolutionStatus {
 		      ///Feasible solution hasn't been found (but may exist).
 		      ///\todo NOTFOUND might be a better name.
 		      ///
 		      UNDEFINED = 0,
 		      ///The problem has no feasible solution
 		      INFEASIBLE = 1,
 		      ///Feasible solution found
 		      FEASIBLE = 2,
 		      ///Optimal solution exists and found
 		      OPTIMAL = 3,
 		      ///The cost function is unbounded
 		      ///\todo Give a feasible solution and an infinite ray (and the
 		      ///corresponding bases)
 		      INFINITE = 4
 		    };
 		    ///\e The type of the investigated LP problem
 		    enum ProblemTypes {
 		      ///Primal-dual feasible
 		      PRIMAL_DUAL_FEASIBLE = 0,
 		      ///Primal feasible dual infeasible
 		      PRIMAL_FEASIBLE_DUAL_INFEASIBLE = 1,
 		      ///Primal infeasible dual feasible
 		      PRIMAL_INFEASIBLE_DUAL_FEASIBLE = 2,
 		      ///Primal-dual infeasible
 		      PRIMAL_DUAL_INFEASIBLE = 3,
 		      ///Could not determine so far
 		      UNKNOWN = 4
 		    ///Direction of the optimization
 		    enum Sense {
 		      /// Minimization
 		      MIN,
 		      /// Maximization
 		      MAX
 		    };
 		    ///The floating point type used by the solver
 		    typedef double Value;
 		    ///The infinity constant
 		    static const Value INF;
 		    ///The not a number constant
 		    static const Value NaN;
 		    static inline bool isNaN(const Value& v) { return v!=v; }
 		    friend class Col;
 		    friend class ColIt;
 		    friend class Row;
 		    friend class RowIt;
 		    ///Refer to a column of the LP.
 		    ///This type is used to refer to a column of the LP.
 		    ///
 		    ///Its value remains valid and correct even after the addition or erase of
 		    ///other columns.
 		    ///
 		    ///\todo Document what can one do with a Col (INVALID, comparing,
 		    ///it is similar to Node/Edge)
 		    ///\note This class is similar to other Item types in LEMON, like
 		    ///Node and Arc types in digraph.
 		    class Col {
 		      friend class LpBase;
 		    protected:
 		      int id;
 		      friend class LpSolverBase;
 		      friend class MipSolverBase;
 		      explicit Col(int _id) : id(_id) {}
 		      int _id;
 		      explicit Col(int id) : _id(id) {}
 		    public:
 		      typedef Value ExprValue;
-		      typedef True LpSolverCol;
+		      typedef True LpCol;
 		      /// Default constructor
 		      /// \warning The default constructor sets the Col to an
 		      /// undefined value.
 		      Col() {}
 		      Col(const Invalid&) : id(-1) {}
 		      bool operator< (Col c) const  {return id< c.id;}
 		      bool operator> (Col c) const  {return id> c.id;}
 		      bool operator==(Col c) const  {return id==c.id;}
-		      bool operator!=(Col c) const  {return id!=c.id;}
+		      /// Invalid constructor \& conversion.
 		      /// This constructor initializes the Col to be invalid.
 		      /// \sa Invalid for more details.
 		      Col(const Invalid&) : _id(-1) {}
 		      /// Equality operator
 		      /// Two \ref Col "Col"s are equal if and only if they point to
 		      /// the same LP column or both are invalid.
 		      bool operator==(Col c) const  {return _id == c._id;}
 		      /// Inequality operator
 		      /// \sa operator==(Col c)
 		      ///
 		      bool operator!=(Col c) const  {return _id != c._id;}
 		      /// Artificial ordering operator.
 		      /// To allow the use of this object in std::map or similar
 		      /// associative container we require this.
 		      ///
 		      /// \note This operator only have to define some strict ordering of
 		      /// the items; this order has nothing to do with the iteration
 		      /// ordering of the items.
 		      bool operator<(Col c) const  {return _id < c._id;}
 		    };
 		    ///Iterator for iterate over the columns of an LP problem
 		    /// Its usage is quite simple, for example you can count the number
 		    /// of columns in an LP \c lp:
 		    ///\code
 		    /// int count=0;
 		    /// for (LpBase::ColIt c(lp); c!=INVALID; ++c) ++count;
 		    ///\endcode
 		    class ColIt : public Col {
-		      const LpSolverBase *_lp;
+		      const LpBase *_solver;
 		    public:
 		      /// Default constructor
 		      /// \warning The default constructor sets the iterator
 		      /// to an undefined value.
 		      ColIt() {}
-		      ColIt(const LpSolverBase &lp) : _lp(&lp)
+		      /// Sets the iterator to the first Col
 		      /// Sets the iterator to the first Col.
 		      ///
 		      ColIt(const LpBase &solver) : _solver(&solver)
+		      {
-		        _lp->cols.firstFix(id);
+		        _solver->cols.firstItem(_id);
+		      }
 		      /// Invalid constructor \& conversion
 		      /// Initialize the iterator to be invalid.
 		      /// \sa Invalid for more details.
 		      ColIt(const Invalid&) : Col(INVALID) {}
 		      /// Next column
 		      /// Assign the iterator to the next column.
 		      ///
 		      ColIt &operator++()
+		      {
-		        _lp->cols.nextFix(id);
+		        _solver->cols.nextItem(_id);
 		        return *this;
+		      }
 		    };
 		    static int id(const Col& col) { return col.id; }
 		    /// \brief Returns the ID of the column.
 		    static int id(const Col& col) { return col._id; }
 		    /// \brief Returns the column with the given ID.
 		    ///
 		    /// \pre The argument should be a valid column ID in the LP problem.
 		    static Col colFromId(int id) { return Col(id); }
 		    ///Refer to a row of the LP.
 		    ///This type is used to refer to a row of the LP.
 		    ///
 		    ///Its value remains valid and correct even after the addition or erase of
 		    ///other rows.
 		    ///
 		    ///\todo Document what can one do with a Row (INVALID, comparing,
 		    ///it is similar to Node/Edge)
 		    ///\note This class is similar to other Item types in LEMON, like
 		    ///Node and Arc types in digraph.
 		    class Row {
 		      friend class LpBase;
 		    protected:
 		      int id;
 		      friend class LpSolverBase;
-		      explicit Row(int _id) : id(_id) {}
+		      int _id;
 		      explicit Row(int id) : _id(id) {}
 		    public:
 		      typedef Value ExprValue;
-		      typedef True LpSolverRow;
+		      typedef True LpRow;
 		      /// Default constructor
 		      /// \warning The default constructor sets the Row to an
 		      /// undefined value.
 		      Row() {}
-		      Row(const Invalid&) : id(-1) {}
+		      /// Invalid constructor \& conversion.
 		      bool operator< (Row c) const  {return id< c.id;}
 		      bool operator> (Row c) const  {return id> c.id;}
 		      bool operator==(Row c) const  {return id==c.id;}
 		      bool operator!=(Row c) const  {return id!=c.id;}
 		      /// This constructor initializes the Row to be invalid.
 		      /// \sa Invalid for more details.
 		      Row(const Invalid&) : _id(-1) {}
 		      /// Equality operator
 		      /// Two \ref Row "Row"s are equal if and only if they point to
 		      /// the same LP row or both are invalid.
 		      bool operator==(Row r) const  {return _id == r._id;}
 		      /// Inequality operator
 		      /// \sa operator==(Row r)
 		      ///
 		      bool operator!=(Row r) const  {return _id != r._id;}
 		      /// Artificial ordering operator.
 		      /// To allow the use of this object in std::map or similar
 		      /// associative container we require this.
 		      ///
 		      /// \note This operator only have to define some strict ordering of
 		      /// the items; this order has nothing to do with the iteration
 		      /// ordering of the items.
 		      bool operator<(Row r) const  {return _id < r._id;}
 		    };
 		    ///Iterator for iterate over the rows of an LP problem
 		    /// Its usage is quite simple, for example you can count the number
 		    /// of rows in an LP \c lp:
 		    ///\code
 		    /// int count=0;
 		    /// for (LpBase::RowIt c(lp); c!=INVALID; ++c) ++count;
 		    ///\endcode
 		    class RowIt : public Row {
-		      const LpSolverBase *_lp;
+		      const LpBase *_solver;
 		    public:
 		      /// Default constructor
 		      /// \warning The default constructor sets the iterator
 		      /// to an undefined value.
 		      RowIt() {}
-		      RowIt(const LpSolverBase &lp) : _lp(&lp)
+		      /// Sets the iterator to the first Row
 		      /// Sets the iterator to the first Row.
 		      ///
 		      RowIt(const LpBase &solver) : _solver(&solver)
+		      {
-		        _lp->rows.firstFix(id);
+		        _solver->rows.firstItem(_id);
+		      }
 		      /// Invalid constructor \& conversion
 		      /// Initialize the iterator to be invalid.
 		      /// \sa Invalid for more details.
 		      RowIt(const Invalid&) : Row(INVALID) {}
 		      /// Next row
 		      /// Assign the iterator to the next row.
 		      ///
 		      RowIt &operator++()
+		      {
-		        _lp->rows.nextFix(id);
+		        _solver->rows.nextItem(_id);
 		        return *this;
+		      }
 		    };
 		    static int id(const Row& row) { return row.id; }
 		  protected:
 		    int _lpId(const Col& c) const {
 		      return cols.floatingId(id(c));
+		    }
 		    int _lpId(const Row& r) const {
 		      return rows.floatingId(id(r));
+		    }
 		    Col _item(int i, Col) const {
 		      return Col(cols.fixId(i));
+		    }
 		    Row _item(int i, Row) const {
 		      return Row(rows.fixId(i));
+		    }
 		    /// \brief Returns the ID of the row.
 		    static int id(const Row& row) { return row._id; }
 		    /// \brief Returns the row with the given ID.
 		    ///
 		    /// \pre The argument should be a valid row ID in the LP problem.
 		    static Row rowFromId(int id) { return Row(id); }
 		  public:
 		    ///Linear expression of variables and a constant component
 		    ///This data structure stores a linear expression of the variables
 		    ///(\ref Col "Col"s) and also has a constant component.
 		    ///
 		    ///There are several ways to access and modify the contents of this
 		    ///container.
 		    ///- Its it fully compatible with \c std::map<Col,double>, so for expamle
 		    ///if \c e is an Expr and \c v and \c w are of type \ref Col, then you can
 		    ///read and modify the coefficients like
 		    ///these.
 		    ///\code
 		    ///e[v]=5;
 		    ///e[v]+=12;
 		    ///e.erase(v);
 		    ///\endcode
 		    ///or you can also iterate through its elements.
 		    ///\code
 		    ///double s=0;
 		    ///for(LpSolverBase::Expr::iterator i=e.begin();i!=e.end();++i)
 		    ///  s+=i->second;
 		    ///for(LpBase::Expr::ConstCoeffIt i(e);i!=INVALID;++i)
 		    ///  s+=*i * primal(i);
 		    ///\endcode
-		    ///(This code computes the sum of all coefficients).
+		    ///(This code computes the primal value of the expression).
 		    ///- Numbers (<tt>double</tt>'s)
 		    ///and variables (\ref Col "Col"s) directly convert to an
 		    ///\ref Expr and the usual linear operations are defined, so
 		    ///\code
 		    ///v+w
 		    ///2*v-3.12*(v-w/2)+2
 		    ///v*2.1+(3*v+(v*12+w+6)*3)/2
 		    ///\endcode
-		    ///are valid \ref Expr "Expr"essions.
+		    ///are valid expressions.
 		    ///The usual assignment operations are also defined.
 		    ///\code
 		    ///e=v+w;
 		    ///e+=2*v-3.12*(v-w/2)+2;
 		    ///e*=3.4;
 		    ///e/=5;
 		    ///\endcode
-		    ///- The constant member can be set and read by \ref constComp()
+		    ///- The constant member can be set and read by dereference
 		    ///  operator (unary *)
 		    ///
 		    ///\code
 		    ///e.constComp()=12;
 		    ///double c=e.constComp();
 		    ///*e=12;
 		    ///double c=*e;
 		    ///\endcode
 		    ///
 		    ///\note \ref clear() not only sets all coefficients to 0 but also
 		    ///clears the constant components.
 		    ///
 		    ///\sa Constr
 		    ///
 		    class Expr : public std::map<Col,Value>
+		    {
+		    class Expr {
 		      friend class LpBase;
 		    public:
 		      typedef LpSolverBase::Col Key;
 		      typedef LpSolverBase::Value Value;
 		      /// The key type of the expression
 		      typedef LpBase::Col Key;
 		      /// The value type of the expression
 		      typedef LpBase::Value Value;
 		    protected:
-		      typedef std::map<Col,Value> Base;
+		      Value const_comp;
 		      std::map<int, Value> comps;
 		      Value const_comp;
 		    public:
 		      typedef True IsLinExpression;
 		      ///\e
 		      Expr() : Base(), const_comp(0) { }
 		      ///\e
 		      Expr(const Key &v) : const_comp(0) {
 		        Base::insert(std::make_pair(v, 1));
 		      typedef True SolverExpr;
 		      /// Default constructor
 		      /// Construct an empty expression, the coefficients and
 		      /// the constant component are initialized to zero.
 		      Expr() : const_comp(0) {}
 		      /// Construct an expression from a column
 		      /// Construct an expression, which has a term with \c c variable
 		      /// and 1.0 coefficient.
 		      Expr(const Col &c) : const_comp(0) {
 		        typedef std::map<int, Value>::value_type pair_type;
 		        comps.insert(pair_type(id(c), 1));
+		      }
-		      ///\e
+		      /// Construct an expression from a constant
 		      /// Construct an expression, which's constant component is \c v.
 		      ///
 		      Expr(const Value &v) : const_comp(v) {}
 		      ///\e
 		      void set(const Key &v,const Value &c) {
-		        Base::insert(std::make_pair(v, c));
+		      /// Returns the coefficient of the column
 		      Value operator[](const Col& c) const {
 		        std::map<int, Value>::const_iterator it=comps.find(id(c));
 		        if (it != comps.end()) {
 		          return it->second;
 		        } else {
 		          return 0;
+		      }
 		      ///\e
 		      Value &constComp() { return const_comp; }
 		      ///\e
 		      const Value &constComp() const { return const_comp; }
 		      ///Removes the components with zero coefficient.
 		      void simplify() {
 		        for (Base::iterator i=Base::begin(); i!=Base::end();) {
 		          Base::iterator j=i;
 		          ++j;
 		          if ((*i).second==0) Base::erase(i);
 		          i=j;
+		        }
 		      /// Returns the coefficient of the column
 		      Value& operator[](const Col& c) {
 		        return comps[id(c)];
+		      }
 		      /// Sets the coefficient of the column
 		      void set(const Col &c, const Value &v) {
 		        if (v != 0.0) {
 		          typedef std::map<int, Value>::value_type pair_type;
 		          comps.insert(pair_type(id(c), v));
 		        } else {
 		          comps.erase(id(c));
+		        }
+		      }
 		      /// Returns the constant component of the expression
 		      Value& operator*() { return const_comp; }
 		      /// Returns the constant component of the expression
 		      const Value& operator*() const { return const_comp; }
 		      /// \brief Removes the coefficients which's absolute value does
 		      /// not exceed \c epsilon. It also sets to zero the constant
 		      /// component, if it does not exceed epsilon in absolute value.
 		      void simplify(Value epsilon = 0.0) {
 		        std::map<int, Value>::iterator it=comps.begin();
 		        while (it != comps.end()) {
 		          std::map<int, Value>::iterator jt=it;
 		          ++jt;
 		          if (std::fabs((*it).second) <= epsilon) comps.erase(it);
 		          it=jt;
+		        }
 		        if (std::fabs(const_comp) <= epsilon) const_comp = 0;
+		      }
 		      void simplify() const {
 		        const_cast<Expr*>(this)->simplify();
+		      }
 		      ///Removes the coefficients closer to zero than \c tolerance.
 		      void simplify(double &tolerance) {
 		        for (Base::iterator i=Base::begin(); i!=Base::end();) {
 		          Base::iterator j=i;
 		          ++j;
 		          if (std::fabs((*i).second)<tolerance) Base::erase(i);
 		          i=j;
+		        }
 		      void simplify(Value epsilon = 0.0) const {
 		        const_cast<Expr*>(this)->simplify(epsilon);
+		      }
 		      ///Sets all coefficients and the constant component to 0.
 		      void clear() {
-		        Base::clear();
+		        comps.clear();
 		        const_comp=0;
+		      }
-		      ///\e
+		      ///Compound assignment
 		      Expr &operator+=(const Expr &e) {
 		        for (Base::const_iterator j=e.begin(); j!=e.end(); ++j)
 		          (*this)[j->first]+=j->second;
 		        for (std::map<int, Value>::const_iterator it=e.comps.begin();
 		             it!=e.comps.end(); ++it)
 		          comps[it->first]+=it->second;
 		        const_comp+=e.const_comp;
 		        return *this;
+		      }
-		      ///\e
+		      ///Compound assignment
 		      Expr &operator-=(const Expr &e) {
 		        for (Base::const_iterator j=e.begin(); j!=e.end(); ++j)
 		          (*this)[j->first]-=j->second;
 		        for (std::map<int, Value>::const_iterator it=e.comps.begin();
 		             it!=e.comps.end(); ++it)
 		          comps[it->first]-=it->second;
 		        const_comp-=e.const_comp;
 		        return *this;
+		      }
 		      ///\e
 		      Expr &operator*=(const Value &c) {
 		        for (Base::iterator j=Base::begin(); j!=Base::end(); ++j)
 		          j->second*=c;
-		        const_comp*=c;
+		      ///Multiply with a constant
 		      Expr &operator*=(const Value &v) {
 		        for (std::map<int, Value>::iterator it=comps.begin();
 		             it!=comps.end(); ++it)
 		          it->second*=v;
 		        const_comp*=v;
 		        return *this;
+		      }
-		      ///\e
+		      ///Division with a constant
 		      Expr &operator/=(const Value &c) {
 		        for (Base::iterator j=Base::begin(); j!=Base::end(); ++j)
 		          j->second/=c;
 		        for (std::map<int, Value>::iterator it=comps.begin();
 		             it!=comps.end(); ++it)
 		          it->second/=c;
 		        const_comp/=c;
 		        return *this;
+		      }
 		      ///Iterator over the expression
 		      ///The iterator iterates over the terms of the expression.
 		      ///
 		      ///\code
 		      ///double s=0;
 		      ///for(LpBase::Expr::CoeffIt i(e);i!=INVALID;++i)
 		      ///  s+= *i * primal(i);
 		      ///\endcode
 		      class CoeffIt {
 		      private:
 		        std::map<int, Value>::iterator _it, _end;
 		      public:
 		        /// Sets the iterator to the first term
 		        /// Sets the iterator to the first term of the expression.
 		        ///
 		        CoeffIt(Expr& e)
 		          : _it(e.comps.begin()), _end(e.comps.end()){}
 		        /// Convert the iterator to the column of the term
 		        operator Col() const {
 		          return colFromId(_it->first);
+		        }
 		        /// Returns the coefficient of the term
 		        Value& operator*() { return _it->second; }
 		        /// Returns the coefficient of the term
 		        const Value& operator*() const { return _it->second; }
 		        /// Next term
 		        /// Assign the iterator to the next term.
 		        ///
 		        CoeffIt& operator++() { ++_it; return *this; }
 		        /// Equality operator
 		        bool operator==(Invalid) const { return _it == _end; }
 		        /// Inequality operator
 		        bool operator!=(Invalid) const { return _it != _end; }
 		      };
 		      /// Const iterator over the expression
 		      ///The iterator iterates over the terms of the expression.
 		      ///
 		      ///\code
 		      ///double s=0;
 		      ///for(LpBase::Expr::ConstCoeffIt i(e);i!=INVALID;++i)
 		      ///  s+=*i * primal(i);
 		      ///\endcode
 		      class ConstCoeffIt {
 		      private:
 		        std::map<int, Value>::const_iterator _it, _end;
 		      public:
 		        /// Sets the iterator to the first term
 		        /// Sets the iterator to the first term of the expression.
 		        ///
 		        ConstCoeffIt(const Expr& e)
 		          : _it(e.comps.begin()), _end(e.comps.end()){}
 		        /// Convert the iterator to the column of the term
 		        operator Col() const {
 		          return colFromId(_it->first);
+		        }
 		        /// Returns the coefficient of the term
 		        const Value& operator*() const { return _it->second; }
 		        /// Next term
 		        /// Assign the iterator to the next term.
 		        ///
 		        ConstCoeffIt& operator++() { ++_it; return *this; }
 		        /// Equality operator
 		        bool operator==(Invalid) const { return _it == _end; }
 		        /// Inequality operator
 		        bool operator!=(Invalid) const { return _it != _end; }
 		      };
 		    };
 		    ///Linear constraint
 		    ///This data stucture represents a linear constraint in the LP.
 		    ///Basically it is a linear expression with a lower or an upper bound
 		    ///(or both). These parts of the constraint can be obtained by the member
 		    ///functions \ref expr(), \ref lowerBound() and \ref upperBound(),
 		    ///respectively.
 		    ///There are two ways to construct a constraint.
 		    ///- You can set the linear expression and the bounds directly
 		    ///  by the functions above.
@@ -385,50 +536,43 @@
 		    ///  are defined between expressions, or even between constraints whenever
 		    ///  it makes sense. Therefore if \c e and \c f are linear expressions and
 		    ///  \c s and \c t are numbers, then the followings are valid expressions
 		    ///  and thus they can be used directly e.g. in \ref addRow() whenever
 		    ///  it makes sense.
 		    ///\code
 		    ///  e<=s
 		    ///  e<=f
 		    ///  e==f
 		    ///  s<=e<=t
 		    ///  e>=t
 		    ///\endcode
 		    ///\warning The validity of a constraint is checked only at run time, so
 		    ///e.g. \ref addRow(<tt>x[1]\<=x[2]<=5</tt>) will compile, but will throw
-		    ///an assertion.
+		    ///\warning The validity of a constraint is checked only at run
 		    ///time, so e.g. \ref addRow(<tt>x[1]\<=x[2]<=5</tt>) will
 		    ///compile, but will fail an assertion.
 		    class Constr
+		    {
 		    public:
-		      typedef LpSolverBase::Expr Expr;
+		      typedef LpBase::Expr Expr;
 		      typedef Expr::Key Key;
 		      typedef Expr::Value Value;
 		    protected:
 		      Expr _expr;
 		      Value _lb,_ub;
 		    public:
 		      ///\e
 		      Constr() : _expr(), _lb(NaN), _ub(NaN) {}
 		      ///\e
 		      Constr(Value lb,const Expr &e,Value ub) :
 		        _expr(e), _lb(lb), _ub(ub) {}
 		      ///\e
 		      Constr(const Expr &e,Value ub) :
 		        _expr(e), _lb(NaN), _ub(ub) {}
 		      ///\e
 		      Constr(Value lb,const Expr &e) :
 		        _expr(e), _lb(lb), _ub(NaN) {}
 		      ///\e
 		      Constr(const Expr &e) :
 		        _expr(e), _lb(NaN), _ub(NaN) {}
 		      ///\e
 		      void clear()
+		      {
 		        _expr.clear();
 		        _lb=_ub=NaN;
+		      }
 		      ///Reference to the linear expression
 		      Expr &expr() { return _expr; }
 		      ///Cont reference to the linear expression
@@ -444,1262 +588,1493 @@
 		      const Value &lowerBound() const { return _lb; }
 		      ///Reference to the upper bound.
 		      ///\return
 		      ///- \ref INF "INF": the constraint is upper unbounded.
 		      ///- \ref NaN "NaN": upper bound has not been set.
 		      ///- finite number: the upper bound
 		      Value &upperBound() { return _ub; }
 		      ///The const version of \ref upperBound()
 		      const Value &upperBound() const { return _ub; }
 		      ///Is the constraint lower bounded?
 		      bool lowerBounded() const {
-		        return isFinite(_lb);
+		        return _lb != -INF && !std::isnan(_lb);
+		      }
 		      ///Is the constraint upper bounded?
 		      bool upperBounded() const {
-		        return isFinite(_ub);
+		        return _ub != INF && !std::isnan(_ub);
+		      }
 		    };
 		    ///Linear expression of rows
 		    ///This data structure represents a column of the matrix,
 		    ///thas is it strores a linear expression of the dual variables
 		    ///(\ref Row "Row"s).
 		    ///
 		    ///There are several ways to access and modify the contents of this
 		    ///container.
 		    ///- Its it fully compatible with \c std::map<Row,double>, so for expamle
 		    ///if \c e is an DualExpr and \c v
 		    ///and \c w are of type \ref Row, then you can
 		    ///read and modify the coefficients like
 		    ///these.
 		    ///\code
 		    ///e[v]=5;
 		    ///e[v]+=12;
 		    ///e.erase(v);
 		    ///\endcode
 		    ///or you can also iterate through its elements.
 		    ///\code
 		    ///double s=0;
 		    ///for(LpSolverBase::DualExpr::iterator i=e.begin();i!=e.end();++i)
 		    ///  s+=i->second;
 		    ///for(LpBase::DualExpr::ConstCoeffIt i(e);i!=INVALID;++i)
 		    ///  s+=*i;
 		    ///\endcode
 		    ///(This code computes the sum of all coefficients).
 		    ///- Numbers (<tt>double</tt>'s)
 		    ///and variables (\ref Row "Row"s) directly convert to an
 		    ///\ref DualExpr and the usual linear operations are defined, so
 		    ///\code
 		    ///v+w
 		    ///2*v-3.12*(v-w/2)
 		    ///v*2.1+(3*v+(v*12+w)*3)/2
 		    ///\endcode
-		    ///are valid \ref DualExpr "DualExpr"essions.
+		    ///are valid \ref DualExpr dual expressions.
 		    ///The usual assignment operations are also defined.
 		    ///\code
 		    ///e=v+w;
 		    ///e+=2*v-3.12*(v-w/2);
 		    ///e*=3.4;
 		    ///e/=5;
 		    ///\endcode
 		    ///
 		    ///\sa Expr
 		    ///
 		    class DualExpr : public std::map<Row,Value>
+		    {
+		    class DualExpr {
 		      friend class LpBase;
 		    public:
 		      typedef LpSolverBase::Row Key;
 		      typedef LpSolverBase::Value Value;
 		      /// The key type of the expression
 		      typedef LpBase::Row Key;
 		      /// The value type of the expression
 		      typedef LpBase::Value Value;
 		    protected:
-		      typedef std::map<Row,Value> Base;
+		      std::map<int, Value> comps;
 		    public:
 		      typedef True IsLinExpression;
 		      ///\e
 		      DualExpr() : Base() { }
 		      ///\e
 		      DualExpr(const Key &v) {
 		        Base::insert(std::make_pair(v, 1));
 		      typedef True SolverExpr;
 		      /// Default constructor
 		      /// Construct an empty expression, the coefficients are
 		      /// initialized to zero.
 		      DualExpr() {}
 		      /// Construct an expression from a row
 		      /// Construct an expression, which has a term with \c r dual
 		      /// variable and 1.0 coefficient.
 		      DualExpr(const Row &r) {
 		        typedef std::map<int, Value>::value_type pair_type;
 		        comps.insert(pair_type(id(r), 1));
+		      }
 		      ///\e
 		      void set(const Key &v,const Value &c) {
-		        Base::insert(std::make_pair(v, c));
+		      /// Returns the coefficient of the row
 		      Value operator[](const Row& r) const {
 		        std::map<int, Value>::const_iterator it = comps.find(id(r));
 		        if (it != comps.end()) {
 		          return it->second;
 		        } else {
 		          return 0;
+		        }
+		      }
 		      /// Returns the coefficient of the row
 		      Value& operator[](const Row& r) {
 		        return comps[id(r)];
+		      }
 		      /// Sets the coefficient of the row
 		      void set(const Row &r, const Value &v) {
 		        if (v != 0.0) {
 		          typedef std::map<int, Value>::value_type pair_type;
 		          comps.insert(pair_type(id(r), v));
 		        } else {
 		          comps.erase(id(r));
+		        }
+		      }
 		      /// \brief Removes the coefficients which's absolute value does
 		      /// not exceed \c epsilon.
 		      void simplify(Value epsilon = 0.0) {
 		        std::map<int, Value>::iterator it=comps.begin();
 		        while (it != comps.end()) {
 		          std::map<int, Value>::iterator jt=it;
 		          ++jt;
 		          if (std::fabs((*it).second) <= epsilon) comps.erase(it);
 		          it=jt;
+		        }
+		      }
 		      ///Removes the components with zero coefficient.
 		      void simplify() {
 		        for (Base::iterator i=Base::begin(); i!=Base::end();) {
 		          Base::iterator j=i;
 		          ++j;
 		          if ((*i).second==0) Base::erase(i);
 		          i=j;
+		        }
+		      }
 		      void simplify() const {
 		        const_cast<DualExpr*>(this)->simplify();
+		      }
 		      ///Removes the coefficients closer to zero than \c tolerance.
 		      void simplify(double &tolerance) {
 		        for (Base::iterator i=Base::begin(); i!=Base::end();) {
 		          Base::iterator j=i;
 		          ++j;
 		          if (std::fabs((*i).second)<tolerance) Base::erase(i);
 		          i=j;
+		        }
 		      void simplify(Value epsilon = 0.0) const {
 		        const_cast<DualExpr*>(this)->simplify(epsilon);
+		      }
 		      ///Sets all coefficients to 0.
 		      void clear() {
-		        Base::clear();
+		        comps.clear();
+		      }
 		      ///Compound assignment
 		      DualExpr &operator+=(const DualExpr &e) {
 		        for (std::map<int, Value>::const_iterator it=e.comps.begin();
 		             it!=e.comps.end(); ++it)
 		          comps[it->first]+=it->second;
 		        return *this;
+		      }
 		      ///Compound assignment
 		      DualExpr &operator-=(const DualExpr &e) {
 		        for (std::map<int, Value>::const_iterator it=e.comps.begin();
 		             it!=e.comps.end(); ++it)
 		          comps[it->first]-=it->second;
 		        return *this;
+		      }
 		      ///Multiply with a constant
 		      DualExpr &operator*=(const Value &v) {
 		        for (std::map<int, Value>::iterator it=comps.begin();
 		             it!=comps.end(); ++it)
 		          it->second*=v;
 		        return *this;
+		      }
 		      ///Division with a constant
 		      DualExpr &operator/=(const Value &v) {
 		        for (std::map<int, Value>::iterator it=comps.begin();
 		             it!=comps.end(); ++it)
 		          it->second/=v;
 		        return *this;
+		      }
 		      ///\e
 		      DualExpr &operator+=(const DualExpr &e) {
 		        for (Base::const_iterator j=e.begin(); j!=e.end(); ++j)
 		          (*this)[j->first]+=j->second;
-		        return *this;
+		      ///Iterator over the expression
 		      ///The iterator iterates over the terms of the expression.
 		      ///
 		      ///\code
 		      ///double s=0;
 		      ///for(LpBase::DualExpr::CoeffIt i(e);i!=INVALID;++i)
 		      ///  s+= *i * dual(i);
 		      ///\endcode
 		      class CoeffIt {
 		      private:
 		        std::map<int, Value>::iterator _it, _end;
 		      public:
 		        /// Sets the iterator to the first term
 		        /// Sets the iterator to the first term of the expression.
 		        ///
 		        CoeffIt(DualExpr& e)
 		          : _it(e.comps.begin()), _end(e.comps.end()){}
 		        /// Convert the iterator to the row of the term
 		        operator Row() const {
 		          return rowFromId(_it->first);
+		      }
 		      ///\e
 		      DualExpr &operator-=(const DualExpr &e) {
 		        for (Base::const_iterator j=e.begin(); j!=e.end(); ++j)
 		          (*this)[j->first]-=j->second;
 		        return *this;
+		      }
 		      ///\e
 		      DualExpr &operator*=(const Value &c) {
 		        for (Base::iterator j=Base::begin(); j!=Base::end(); ++j)
 		          j->second*=c;
 		        return *this;
+		      }
 		      ///\e
 		      DualExpr &operator/=(const Value &c) {
 		        for (Base::iterator j=Base::begin(); j!=Base::end(); ++j)
 		          j->second/=c;
 		        return *this;
+		      }
 		        /// Returns the coefficient of the term
 		        Value& operator*() { return _it->second; }
 		        /// Returns the coefficient of the term
 		        const Value& operator*() const { return _it->second; }
 		        /// Next term
 		        /// Assign the iterator to the next term.
 		        ///
 		        CoeffIt& operator++() { ++_it; return *this; }
 		        /// Equality operator
 		        bool operator==(Invalid) const { return _it == _end; }
 		        /// Inequality operator
 		        bool operator!=(Invalid) const { return _it != _end; }
 		    };
 		      ///Iterator over the expression
 		      ///The iterator iterates over the terms of the expression.
 		      ///
 		      ///\code
 		      ///double s=0;
 		      ///for(LpBase::DualExpr::ConstCoeffIt i(e);i!=INVALID;++i)
 		      ///  s+= *i * dual(i);
 		      ///\endcode
 		      class ConstCoeffIt {
 		  private:
 		    template <typename _Expr>
 		    class MappedOutputIterator {
 		        std::map<int, Value>::const_iterator _it, _end;
 		    public:
-		      typedef std::insert_iterator<_Expr> Base;
+		        /// Sets the iterator to the first term
 		        /// Sets the iterator to the first term of the expression.
 		        ///
 		        ConstCoeffIt(const DualExpr& e)
 		          : _it(e.comps.begin()), _end(e.comps.end()){}
 		        /// Convert the iterator to the row of the term
 		        operator Row() const {
 		          return rowFromId(_it->first);
+		        }
 		        /// Returns the coefficient of the term
 		        const Value& operator*() const { return _it->second; }
 		        /// Next term
 		        /// Assign the iterator to the next term.
 		        ///
 		        ConstCoeffIt& operator++() { ++_it; return *this; }
 		        /// Equality operator
 		        bool operator==(Invalid) const { return _it == _end; }
 		        /// Inequality operator
 		        bool operator!=(Invalid) const { return _it != _end; }
 		      };
 		    };
 		  protected:
 		    class InsertIterator {
 		    private:
 		      std::map<int, Value>& _host;
 		      const _solver_bits::VarIndex& _index;
 		    public:
 		      typedef std::output_iterator_tag iterator_category;
 		      typedef void difference_type;
 		      typedef void value_type;
 		      typedef void reference;
 		      typedef void pointer;
 		      MappedOutputIterator(const Base& _base, const LpSolverBase& _lp)
 		        : base(_base), lp(_lp) {}
 		      InsertIterator(std::map<int, Value>& host,
 		                   const _solver_bits::VarIndex& index)
 		        : _host(host), _index(index) {}
-		      MappedOutputIterator& operator*() {
+		      InsertIterator& operator=(const std::pair<int, Value>& value) {
 		        typedef std::map<int, Value>::value_type pair_type;
 		        _host.insert(pair_type(_index[value.first], value.second));
 		        return *this;
+		      }
 		      MappedOutputIterator& operator=(const std::pair<int, Value>& value) {
 		        *base = std::make_pair(lp._item(value.first, typename _Expr::Key()),
 		                               value.second);
 		        return *this;
+		      }
+		      InsertIterator& operator*() { return *this; }
 		      InsertIterator& operator++() { return *this; }
 		      InsertIterator operator++(int) { return *this; }
 		      MappedOutputIterator& operator++() {
 		        ++base;
 		        return *this;
+		      }
 		      MappedOutputIterator operator++(int) {
 		        MappedOutputIterator tmp(*this);
 		        ++base;
 		        return tmp;
+		      }
 		      bool operator==(const MappedOutputIterator& it) const {
 		        return base == it.base;
+		      }
 		      bool operator!=(const MappedOutputIterator& it) const {
 		        return base != it.base;
+		      }
 		    private:
 		      Base base;
 		      const LpSolverBase& lp;
 		    };
 		    template <typename Expr>
 		    class MappedInputIterator {
 		    class ExprIterator {
 		    private:
 		      std::map<int, Value>::const_iterator _host_it;
 		      const _solver_bits::VarIndex& _index;
 		    public:
 		      typedef typename Expr::const_iterator Base;
 		      typedef typename Base::iterator_category iterator_category;
 		      typedef typename Base::difference_type difference_type;
 		      typedef std::bidirectional_iterator_tag iterator_category;
 		      typedef std::ptrdiff_t difference_type;
 		      typedef const std::pair<int, Value> value_type;
 		      typedef value_type reference;
 		      class pointer {
 		      public:
 		        pointer(value_type& _value) : value(_value) {}
 		        value_type* operator->() { return &value; }
 		      private:
 		        value_type value;
 		      };
 		      MappedInputIterator(const Base& _base, const LpSolverBase& _lp)
 		        : base(_base), lp(_lp) {}
 		      ExprIterator(const std::map<int, Value>::const_iterator& host_it,
 		                   const _solver_bits::VarIndex& index)
 		        : _host_it(host_it), _index(index) {}
 		      reference operator*() {
-		        return std::make_pair(lp._lpId(base->first), base->second);
+		        return std::make_pair(_index(_host_it->first), _host_it->second);
+		      }
 		      pointer operator->() {
 		        return pointer(operator*());
+		      }
 		      MappedInputIterator& operator++() {
 		        ++base;
 		        return *this;
+		      ExprIterator& operator++() { ++_host_it; return *this; }
 		      ExprIterator operator++(int) {
 		        ExprIterator tmp(*this); ++_host_it; return tmp;
+		      }
 		      MappedInputIterator operator++(int) {
 		        MappedInputIterator tmp(*this);
 		        ++base;
 		        return tmp;
 		      ExprIterator& operator--() { --_host_it; return *this; }
 		      ExprIterator operator--(int) {
 		        ExprIterator tmp(*this); --_host_it; return tmp;
+		      }
 		      bool operator==(const MappedInputIterator& it) const {
 		        return base == it.base;
 		      bool operator==(const ExprIterator& it) const {
 		        return _host_it == it._host_it;
+		      }
 		      bool operator!=(const MappedInputIterator& it) const {
 		        return base != it.base;
 		      bool operator!=(const ExprIterator& it) const {
 		        return _host_it != it._host_it;
+		      }
 		    private:
 		      Base base;
 		      const LpSolverBase& lp;
 		    };
 		  protected:
 		    /// STL compatible iterator for lp col
 		    typedef MappedInputIterator<Expr> ConstRowIterator;
 		    /// STL compatible iterator for lp row
 		    typedef MappedInputIterator<DualExpr> ConstColIterator;
 		    //Abstract virtual functions
 		    virtual LpBase* _newSolver() const = 0;
 		    virtual LpBase* _cloneSolver() const = 0;
 		    /// STL compatible iterator for lp col
 		    typedef MappedOutputIterator<Expr> RowIterator;
 		    /// STL compatible iterator for lp row
 		    typedef MappedOutputIterator<DualExpr> ColIterator;
 		    virtual int _addColId(int col) { return cols.addIndex(col); }
 		    virtual int _addRowId(int row) { return rows.addIndex(row); }
 		    //Abstract virtual functions
 		    virtual LpSolverBase* _newLp() = 0;
 		    virtual LpSolverBase* _copyLp(){
 		      LpSolverBase* newlp = _newLp();
 		      std::map<Col, Col> ref;
 		      for (LpSolverBase::ColIt it(*this); it != INVALID; ++it) {
 		        Col ccol = newlp->addCol();
 		        ref[it] = ccol;
 		        newlp->colName(ccol, colName(it));
 		        newlp->colLowerBound(ccol, colLowerBound(it));
 		        newlp->colUpperBound(ccol, colUpperBound(it));
+		      }
 		      for (LpSolverBase::RowIt it(*this); it != INVALID; ++it) {
 		        Expr e = row(it), ce;
 		        for (Expr::iterator jt = e.begin(); jt != e.end(); ++jt) {
 		          ce[ref[jt->first]] = jt->second;
+		        }
 		        ce += e.constComp();
 		        Row r = newlp->addRow(ce);
 		        double lower, upper;
 		        getRowBounds(it, lower, upper);
 		        newlp->rowBounds(r, lower, upper);
+		      }
 		      return newlp;
-		    };
+		    virtual void _eraseColId(int col) { cols.eraseIndex(col); }
 		    virtual void _eraseRowId(int row) { rows.eraseIndex(row); }
 		    virtual int _addCol() = 0;
 		    virtual int _addRow() = 0;
 		    virtual void _eraseCol(int col) = 0;
 		    virtual void _eraseRow(int row) = 0;
 		    virtual void _getColName(int col, std::string & name) const = 0;
 		    virtual void _setColName(int col, const std::string & name) = 0;
 		    virtual int _colByName(const std::string& name) const = 0;
 		    virtual void _setRowCoeffs(int i, ConstRowIterator b,
 		                               ConstRowIterator e) = 0;
 		    virtual void _getRowCoeffs(int i, RowIterator b) const = 0;
 		    virtual void _setColCoeffs(int i, ConstColIterator b,
 		                               ConstColIterator e) = 0;
 		    virtual void _getColCoeffs(int i, ColIterator b) const = 0;
 		    virtual void _getRowName(int row, std::string& name) const = 0;
 		    virtual void _setRowName(int row, const std::string& name) = 0;
 		    virtual int _rowByName(const std::string& name) const = 0;
 		    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e) = 0;
 		    virtual void _getRowCoeffs(int i, InsertIterator b) const = 0;
 		    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e) = 0;
 		    virtual void _getColCoeffs(int i, InsertIterator b) const = 0;
 		    virtual void _setCoeff(int row, int col, Value value) = 0;
 		    virtual Value _getCoeff(int row, int col) const = 0;
 		    virtual void _setColLowerBound(int i, Value value) = 0;
 		    virtual Value _getColLowerBound(int i) const = 0;
 		    virtual void _setColUpperBound(int i, Value value) = 0;
 		    virtual Value _getColUpperBound(int i) const = 0;
 		    virtual void _setRowBounds(int i, Value lower, Value upper) = 0;
 		    virtual void _getRowBounds(int i, Value &lower, Value &upper) const = 0;
 		    virtual void _setRowLowerBound(int i, Value value) = 0;
 		    virtual Value _getRowLowerBound(int i) const = 0;
 		    virtual void _setRowUpperBound(int i, Value value) = 0;
 		    virtual Value _getRowUpperBound(int i) const = 0;
 		    virtual void _setObjCoeffs(ExprIterator b, ExprIterator e) = 0;
 		    virtual void _getObjCoeffs(InsertIterator b) const = 0;
 		    virtual void _setObjCoeff(int i, Value obj_coef) = 0;
 		    virtual Value _getObjCoeff(int i) const = 0;
 		    virtual void _clearObj()=0;
 		    virtual SolveExitStatus _solve() = 0;
 		    virtual Value _getPrimal(int i) const = 0;
 		    virtual Value _getDual(int i) const = 0;
 		    virtual Value _getPrimalValue() const = 0;
 		    virtual bool _isBasicCol(int i) const = 0;
 		    virtual SolutionStatus _getPrimalStatus() const = 0;
 		    virtual SolutionStatus _getDualStatus() const = 0;
 		    virtual ProblemTypes _getProblemType() const = 0;
 		    virtual void _setSense(Sense) = 0;
 		    virtual Sense _getSense() const = 0;
 		    virtual void _setMax() = 0;
 		    virtual void _setMin() = 0;
 		    virtual void _clear() = 0;
 		    virtual bool _isMax() const = 0;
 		    virtual const char* _solverName() const = 0;
 		    //Own protected stuff
 		    //Constant component of the objective function
 		    Value obj_const_comp;
 		    LpBase() : rows(), cols(), obj_const_comp(0) {}
 		  public:
 		    ///\e
 		    LpSolverBase() : obj_const_comp(0) {}
 		    ///\e
-		    virtual ~LpSolverBase() {}
+		    /// Virtual destructor
 		    virtual ~LpBase() {}
 		    ///Creates a new LP problem
-		    LpSolverBase* newLp() {return _newLp();}
+		    LpBase* newSolver() {return _newSolver();}
 		    ///Makes a copy of the LP problem
-		    LpSolverBase* copyLp() {return _copyLp();}
+		    LpBase* cloneSolver() {return _cloneSolver();}
 		    ///Gives back the name of the solver.
 		    const char* solverName() const {return _solverName();}
 		    ///\name Build up and modify the LP
 		    ///@{
 		    ///Add a new empty column (i.e a new variable) to the LP
-		    Col addCol() { Col c; _addCol(); c.id = cols.addId(); return c;}
+		    Col addCol() { Col c; c._id = _addColId(_addCol()); return c;}
 		    ///\brief Adds several new columns
 		    ///(i.e a variables) at once
 		    ///\brief Adds several new columns (i.e variables) at once
 		    ///
 		    ///This magic function takes a container as its argument
 		    ///and fills its elements
-		    ///with new columns (i.e. variables)
+		    ///This magic function takes a container as its argument and fills
 		    ///its elements with new columns (i.e. variables)
 		    ///\param t can be
 		    ///- a standard STL compatible iterable container with
 		    ///\ref Col as its \c values_type
 		    ///like
 		    ///\ref Col as its \c values_type like
 		    ///\code
 		    ///std::vector<LpSolverBase::Col>
 		    ///std::list<LpSolverBase::Col>
 		    ///std::vector<LpBase::Col>
 		    ///std::list<LpBase::Col>
 		    ///\endcode
 		    ///- a standard STL compatible iterable container with
 		    ///\ref Col as its \c mapped_type
 		    ///like
 		    ///\ref Col as its \c mapped_type like
 		    ///\code
-		    ///std::map<AnyType,LpSolverBase::Col>
+		    ///std::map<AnyType,LpBase::Col>
 		    ///\endcode
 		    ///- an iterable lemon \ref concepts::WriteMap "write map" like
 		    ///\code
 		    ///ListGraph::NodeMap<LpSolverBase::Col>
 		    ///ListGraph::EdgeMap<LpSolverBase::Col>
 		    ///ListGraph::NodeMap<LpBase::Col>
 		    ///ListGraph::ArcMap<LpBase::Col>
 		    ///\endcode
 		    ///\return The number of the created column.
 		#ifdef DOXYGEN
 		    template<class T>
 		    int addColSet(T &t) { return 0;}
 		#else
 		    template<class T>
-		    typename enable_if<typename T::value_type::LpSolverCol,int>::type
+		    typename enable_if<typename T::value_type::LpCol,int>::type
 		    addColSet(T &t,dummy<0> = 0) {
 		      int s=0;
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {*i=addCol();s++;}
 		      return s;
+		    }
 		    template<class T>
-		    typename enable_if<typename T::value_type::second_type::LpSolverCol,
+		    typename enable_if<typename T::value_type::second_type::LpCol,
 		                       int>::type
 		    addColSet(T &t,dummy<1> = 1) {
 		      int s=0;
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {
 		        i->second=addCol();
 		        s++;
+		      }
 		      return s;
+		    }
 		    template<class T>
-		    typename enable_if<typename T::MapIt::Value::LpSolverCol,
+		    typename enable_if<typename T::MapIt::Value::LpCol,
 		                       int>::type
 		    addColSet(T &t,dummy<2> = 2) {
 		      int s=0;
 		      for(typename T::MapIt i(t); i!=INVALID; ++i)
+		        {
 		          i.set(addCol());
 		          s++;
+		        }
 		      return s;
+		    }
 		#endif
 		    ///Set a column (i.e a dual constraint) of the LP
 		    ///\param c is the column to be modified
 		    ///\param e is a dual linear expression (see \ref DualExpr)
 		    ///a better one.
 		    void col(Col c,const DualExpr &e) {
 		      e.simplify();
 		      _setColCoeffs(_lpId(c), ConstColIterator(e.begin(), *this),
 		                    ConstColIterator(e.end(), *this));
 		      _setColCoeffs(cols(id(c)), ExprIterator(e.comps.begin(), cols),
 		                    ExprIterator(e.comps.end(), cols));
+		    }
 		    ///Get a column (i.e a dual constraint) of the LP
-		    ///\param r is the column to get
+		    ///\param c is the column to get
 		    ///\return the dual expression associated to the column
 		    DualExpr col(Col c) const {
 		      DualExpr e;
-		      _getColCoeffs(_lpId(c), ColIterator(std::inserter(e, e.end()), *this));
+		      _getColCoeffs(cols(id(c)), InsertIterator(e.comps, rows));
 		      return e;
+		    }
 		    ///Add a new column to the LP
 		    ///\param e is a dual linear expression (see \ref DualExpr)
-		    ///\param obj is the corresponding component of the objective
+		    ///\param o is the corresponding component of the objective
 		    ///function. It is 0 by default.
 		    ///\return The created column.
 		    Col addCol(const DualExpr &e, Value o = 0) {
 		      Col c=addCol();
 		      col(c,e);
 		      objCoeff(c,o);
 		      return c;
+		    }
 		    ///Add a new empty row (i.e a new constraint) to the LP
 		    ///This function adds a new empty row (i.e a new constraint) to the LP.
 		    ///\return The created row
-		    Row addRow() { Row r; _addRow(); r.id = rows.addId(); return r;}
+		    Row addRow() { Row r; r._id = _addRowId(_addRow()); return r;}
 		    ///\brief Add several new rows
 		    ///(i.e a constraints) at once
 		    ///\brief Add several new rows (i.e constraints) at once
 		    ///
 		    ///This magic function takes a container as its argument
 		    ///and fills its elements
-		    ///with new row (i.e. variables)
+		    ///This magic function takes a container as its argument and fills
 		    ///its elements with new row (i.e. variables)
 		    ///\param t can be
 		    ///- a standard STL compatible iterable container with
 		    ///\ref Row as its \c values_type
 		    ///like
 		    ///\ref Row as its \c values_type like
 		    ///\code
 		    ///std::vector<LpSolverBase::Row>
 		    ///std::list<LpSolverBase::Row>
 		    ///std::vector<LpBase::Row>
 		    ///std::list<LpBase::Row>
 		    ///\endcode
 		    ///- a standard STL compatible iterable container with
 		    ///\ref Row as its \c mapped_type
 		    ///like
 		    ///\ref Row as its \c mapped_type like
 		    ///\code
-		    ///std::map<AnyType,LpSolverBase::Row>
+		    ///std::map<AnyType,LpBase::Row>
 		    ///\endcode
 		    ///- an iterable lemon \ref concepts::WriteMap "write map" like
 		    ///\code
 		    ///ListGraph::NodeMap<LpSolverBase::Row>
 		    ///ListGraph::EdgeMap<LpSolverBase::Row>
 		    ///ListGraph::NodeMap<LpBase::Row>
 		    ///ListGraph::ArcMap<LpBase::Row>
 		    ///\endcode
 		    ///\return The number of rows created.
 		#ifdef DOXYGEN
 		    template<class T>
 		    int addRowSet(T &t) { return 0;}
 		#else
 		    template<class T>
-		    typename enable_if<typename T::value_type::LpSolverRow,int>::type
+		    typename enable_if<typename T::value_type::LpRow,int>::type
 		    addRowSet(T &t,dummy<0> = 0) {
 		      int s=0;
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {*i=addRow();s++;}
 		      return s;
+		    }
 		    template<class T>
 		    typename enable_if<typename T::value_type::second_type::LpSolverRow,
 		                       int>::type
 		    typename enable_if<typename T::value_type::second_type::LpRow, int>::type
 		    addRowSet(T &t,dummy<1> = 1) {
 		      int s=0;
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {
 		        i->second=addRow();
 		        s++;
+		      }
 		      return s;
+		    }
 		    template<class T>
 		    typename enable_if<typename T::MapIt::Value::LpSolverRow,
 		                       int>::type
 		    typename enable_if<typename T::MapIt::Value::LpRow, int>::type
 		    addRowSet(T &t,dummy<2> = 2) {
 		      int s=0;
 		      for(typename T::MapIt i(t); i!=INVALID; ++i)
+		        {
 		          i.set(addRow());
 		          s++;
+		        }
 		      return s;
+		    }
 		#endif
 		    ///Set a row (i.e a constraint) of the LP
 		    ///\param r is the row to be modified
 		    ///\param l is lower bound (-\ref INF means no bound)
 		    ///\param e is a linear expression (see \ref Expr)
 		    ///\param u is the upper bound (\ref INF means no bound)
 		    ///\bug This is a temporary function. The interface will change to
 		    ///a better one.
 		    ///\todo Option to control whether a constraint with a single variable is
 		    ///added or not.
 		    void row(Row r, Value l, const Expr &e, Value u) {
 		      e.simplify();
 		      _setRowCoeffs(_lpId(r), ConstRowIterator(e.begin(), *this),
 		                    ConstRowIterator(e.end(), *this));
-		      _setRowBounds(_lpId(r),l-e.constComp(),u-e.constComp());
+		      _setRowCoeffs(rows(id(r)), ExprIterator(e.comps.begin(), cols),
 		                    ExprIterator(e.comps.end(), cols));
 		      _setRowLowerBound(rows(id(r)),l - *e);
 		      _setRowUpperBound(rows(id(r)),u - *e);
+		    }
 		    ///Set a row (i.e a constraint) of the LP
 		    ///\param r is the row to be modified
 		    ///\param c is a linear expression (see \ref Constr)
 		    void row(Row r, const Constr &c) {
 		      row(r, c.lowerBounded()?c.lowerBound():-INF,
 		          c.expr(), c.upperBounded()?c.upperBound():INF);
+		    }
 		    ///Get a row (i.e a constraint) of the LP
 		    ///\param r is the row to get
 		    ///\return the expression associated to the row
 		    Expr row(Row r) const {
 		      Expr e;
-		      _getRowCoeffs(_lpId(r), RowIterator(std::inserter(e, e.end()), *this));
+		      _getRowCoeffs(rows(id(r)), InsertIterator(e.comps, cols));
 		      return e;
+		    }
 		    ///Add a new row (i.e a new constraint) to the LP
 		    ///\param l is the lower bound (-\ref INF means no bound)
 		    ///\param e is a linear expression (see \ref Expr)
 		    ///\param u is the upper bound (\ref INF means no bound)
 		    ///\return The created row.
 		    ///\bug This is a temporary function. The interface will change to
 		    ///a better one.
 		    Row addRow(Value l,const Expr &e, Value u) {
 		      Row r=addRow();
 		      row(r,l,e,u);
 		      return r;
+		    }
 		    ///Add a new row (i.e a new constraint) to the LP
 		    ///\param c is a linear expression (see \ref Constr)
 		    ///\return The created row.
 		    Row addRow(const Constr &c) {
 		      Row r=addRow();
 		      row(r,c);
 		      return r;
+		    }
-		    ///Erase a coloumn (i.e a variable) from the LP
+		    ///Erase a column (i.e a variable) from the LP
 		    ///\param c is the coloumn to be deleted
 		    ///\todo Please check this
 		    void eraseCol(Col c) {
 		      _eraseCol(_lpId(c));
-		      cols.eraseId(c.id);
+		    ///\param c is the column to be deleted
 		    void erase(Col c) {
 		      _eraseCol(cols(id(c)));
 		      _eraseColId(cols(id(c)));
+		    }
 		    ///Erase a  row (i.e a constraint) from the LP
 		    ///\param r is the row to be deleted
 		    ///\todo Please check this
 		    void eraseRow(Row r) {
 		      _eraseRow(_lpId(r));
 		      rows.eraseId(r.id);
 		    void erase(Row r) {
 		      _eraseRow(rows(id(r)));
 		      _eraseRowId(rows(id(r)));
+		    }
 		    /// Get the name of a column
-		    ///\param c is the coresponding coloumn
+		    ///\param c is the coresponding column
 		    ///\return The name of the colunm
 		    std::string colName(Col c) const {
 		      std::string name;
-		      _getColName(_lpId(c), name);
+		      _getColName(cols(id(c)), name);
 		      return name;
+		    }
 		    /// Set the name of a column
-		    ///\param c is the coresponding coloumn
+		    ///\param c is the coresponding column
 		    ///\param name The name to be given
 		    void colName(Col c, const std::string& name) {
-		      _setColName(_lpId(c), name);
+		      _setColName(cols(id(c)), name);
+		    }
 		    /// Get the column by its name
 		    ///\param name The name of the column
 		    ///\return the proper column or \c INVALID
 		    Col colByName(const std::string& name) const {
 		      int k = _colByName(name);
-		      return k != -1 ? Col(cols.fixId(k)) : Col(INVALID);
+		      return k != -1 ? Col(cols[k]) : Col(INVALID);
+		    }
 		    /// Get the name of a row
 		    ///\param r is the coresponding row
 		    ///\return The name of the row
 		    std::string rowName(Row r) const {
 		      std::string name;
 		      _getRowName(rows(id(r)), name);
 		      return name;
+		    }
 		    /// Set the name of a row
 		    ///\param r is the coresponding row
 		    ///\param name The name to be given
 		    void rowName(Row r, const std::string& name) {
 		      _setRowName(rows(id(r)), name);
+		    }
 		    /// Get the row by its name
 		    ///\param name The name of the row
 		    ///\return the proper row or \c INVALID
 		    Row rowByName(const std::string& name) const {
 		      int k = _rowByName(name);
 		      return k != -1 ? Row(rows[k]) : Row(INVALID);
+		    }
 		    /// Set an element of the coefficient matrix of the LP
 		    ///\param r is the row of the element to be modified
-		    ///\param c is the coloumn of the element to be modified
+		    ///\param c is the column of the element to be modified
 		    ///\param val is the new value of the coefficient
 		    void coeff(Row r, Col c, Value val) {
-		      _setCoeff(_lpId(r),_lpId(c), val);
+		      _setCoeff(rows(id(r)),cols(id(c)), val);
+		    }
 		    /// Get an element of the coefficient matrix of the LP
 		    ///\param r is the row of the element in question
 		    ///\param c is the coloumn of the element in question
 		    ///\param r is the row of the element
 		    ///\param c is the column of the element
 		    ///\return the corresponding coefficient
 		    Value coeff(Row r, Col c) const {
-		      return _getCoeff(_lpId(r),_lpId(c));
+		      return _getCoeff(rows(id(r)),cols(id(c)));
+		    }
 		    /// Set the lower bound of a column (i.e a variable)
 		    /// The lower bound of a variable (column) has to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or -\ref INF.
 		    void colLowerBound(Col c, Value value) {
-		      _setColLowerBound(_lpId(c),value);
+		      _setColLowerBound(cols(id(c)),value);
+		    }
 		    /// Get the lower bound of a column (i.e a variable)
-		    /// This function returns the lower bound for column (variable) \t c
+		    /// This function returns the lower bound for column (variable) \c c
 		    /// (this might be -\ref INF as well).
-		    ///\return The lower bound for coloumn \t c
+		    ///\return The lower bound for column \c c
 		    Value colLowerBound(Col c) const {
-		      return _getColLowerBound(_lpId(c));
+		      return _getColLowerBound(cols(id(c)));
+		    }
 		    ///\brief Set the lower bound of  several columns
-		    ///(i.e a variables) at once
 		    ///(i.e variables) at once
 		    ///
 		    ///This magic function takes a container as its argument
 		    ///and applies the function on all of its elements.
 		    /// The lower bound of a variable (column) has to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or -\ref INF.
 		#ifdef DOXYGEN
 		    template<class T>
 		    void colLowerBound(T &t, Value value) { return 0;}
 		#else
 		    template<class T>
-		    typename enable_if<typename T::value_type::LpSolverCol,void>::type
+		    typename enable_if<typename T::value_type::LpCol,void>::type
 		    colLowerBound(T &t, Value value,dummy<0> = 0) {
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {
 		        colLowerBound(*i, value);
+		      }
+		    }
 		    template<class T>
-		    typename enable_if<typename T::value_type::second_type::LpSolverCol,
+		    typename enable_if<typename T::value_type::second_type::LpCol,
 		                       void>::type
 		    colLowerBound(T &t, Value value,dummy<1> = 1) {
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {
 		        colLowerBound(i->second, value);
+		      }
+		    }
 		    template<class T>
-		    typename enable_if<typename T::MapIt::Value::LpSolverCol,
+		    typename enable_if<typename T::MapIt::Value::LpCol,
 		                       void>::type
 		    colLowerBound(T &t, Value value,dummy<2> = 2) {
 		      for(typename T::MapIt i(t); i!=INVALID; ++i){
 		        colLowerBound(*i, value);
+		      }
+		    }
 		#endif
 		    /// Set the upper bound of a column (i.e a variable)
 		    /// The upper bound of a variable (column) has to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or \ref INF.
 		    void colUpperBound(Col c, Value value) {
-		      _setColUpperBound(_lpId(c),value);
+		      _setColUpperBound(cols(id(c)),value);
 		    };
 		    /// Get the upper bound of a column (i.e a variable)
-		    /// This function returns the upper bound for column (variable) \t c
+		    /// This function returns the upper bound for column (variable) \c c
 		    /// (this might be \ref INF as well).
-		    ///\return The upper bound for coloumn \t c
+		    /// \return The upper bound for column \c c
 		    Value colUpperBound(Col c) const {
-		      return _getColUpperBound(_lpId(c));
+		      return _getColUpperBound(cols(id(c)));
+		    }
 		    ///\brief Set the upper bound of  several columns
-		    ///(i.e a variables) at once
 		    ///(i.e variables) at once
 		    ///
 		    ///This magic function takes a container as its argument
 		    ///and applies the function on all of its elements.
 		    /// The upper bound of a variable (column) has to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or \ref INF.
 		#ifdef DOXYGEN
 		    template<class T>
 		    void colUpperBound(T &t, Value value) { return 0;}
 		#else
 		    template<class T>
-		    typename enable_if<typename T::value_type::LpSolverCol,void>::type
+		    typename enable_if<typename T::value_type::LpCol,void>::type
 		    colUpperBound(T &t, Value value,dummy<0> = 0) {
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {
 		        colUpperBound(*i, value);
+		      }
+		    }
 		    template<class T>
-		    typename enable_if<typename T::value_type::second_type::LpSolverCol,
+		    typename enable_if<typename T::value_type::second_type::LpCol,
 		                       void>::type
 		    colUpperBound(T &t, Value value,dummy<1> = 1) {
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {
 		        colUpperBound(i->second, value);
+		      }
+		    }
 		    template<class T>
-		    typename enable_if<typename T::MapIt::Value::LpSolverCol,
+		    typename enable_if<typename T::MapIt::Value::LpCol,
 		                       void>::type
 		    colUpperBound(T &t, Value value,dummy<2> = 2) {
 		      for(typename T::MapIt i(t); i!=INVALID; ++i){
 		        colUpperBound(*i, value);
+		      }
+		    }
 		#endif
 		    /// Set the lower and the upper bounds of a column (i.e a variable)
 		    /// The lower and the upper bounds of
 		    /// a variable (column) have to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value, -\ref INF or \ref INF.
 		    void colBounds(Col c, Value lower, Value upper) {
 		      _setColLowerBound(_lpId(c),lower);
 		      _setColUpperBound(_lpId(c),upper);
 		      _setColLowerBound(cols(id(c)),lower);
 		      _setColUpperBound(cols(id(c)),upper);
+		    }
 		    ///\brief Set the lower and the upper bound of several columns
-		    ///(i.e a variables) at once
 		    ///(i.e variables) at once
 		    ///
 		    ///This magic function takes a container as its argument
 		    ///and applies the function on all of its elements.
 		    /// The lower and the upper bounds of
 		    /// a variable (column) have to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value, -\ref INF or \ref INF.
 		#ifdef DOXYGEN
 		    template<class T>
 		    void colBounds(T &t, Value lower, Value upper) { return 0;}
 		#else
 		    template<class T>
-		    typename enable_if<typename T::value_type::LpSolverCol,void>::type
+		    typename enable_if<typename T::value_type::LpCol,void>::type
 		    colBounds(T &t, Value lower, Value upper,dummy<0> = 0) {
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {
 		        colBounds(*i, lower, upper);
+		      }
+		    }
 		    template<class T>
 		    typename enable_if<typename T::value_type::second_type::LpSolverCol,
 		                       void>::type
 		    typename enable_if<typename T::value_type::second_type::LpCol, void>::type
 		    colBounds(T &t, Value lower, Value upper,dummy<1> = 1) {
 		      for(typename T::iterator i=t.begin();i!=t.end();++i) {
 		        colBounds(i->second, lower, upper);
+		      }
+		    }
 		    template<class T>
 		    typename enable_if<typename T::MapIt::Value::LpSolverCol,
 		                       void>::type
 		    typename enable_if<typename T::MapIt::Value::LpCol, void>::type
 		    colBounds(T &t, Value lower, Value upper,dummy<2> = 2) {
 		      for(typename T::MapIt i(t); i!=INVALID; ++i){
 		        colBounds(*i, lower, upper);
+		      }
+		    }
 		#endif
 		    /// Set the lower bound of a row (i.e a constraint)
 		    /// Set the lower and the upper bounds of a row (i.e a constraint)
 		    /// The lower and the upper bound of a constraint (row) have to be
 		    /// given by an extended number of type Value, i.e. a finite
 		    /// number of type Value, -\ref INF or \ref INF. There is no
 		    /// separate function for the lower and the upper bound because
 		    /// that would have been hard to implement for CPLEX.
 		    void rowBounds(Row c, Value lower, Value upper) {
-		      _setRowBounds(_lpId(c),lower, upper);
+		    /// The lower bound of a constraint (row) has to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or -\ref INF.
 		    void rowLowerBound(Row r, Value value) {
 		      _setRowLowerBound(rows(id(r)),value);
+		    }
-		    /// Get the lower and the upper bounds of a row (i.e a constraint)
+		    /// Get the lower bound of a row (i.e a constraint)
 		    /// The lower and the upper bound of
 		    /// a constraint (row) are
 		    /// extended numbers of type Value, i.e.  finite numbers of type
 		    /// Value, -\ref INF or \ref INF.
 		    /// \todo There is no separate function for the
 		    /// lower and the upper bound because we had problems with the
 		    /// implementation of the setting functions for CPLEX:
 		    /// check out whether this can be done for these functions.
 		    void getRowBounds(Row c, Value &lower, Value &upper) const {
 		      _getRowBounds(_lpId(c),lower, upper);
 		    /// This function returns the lower bound for row (constraint) \c c
 		    /// (this might be -\ref INF as well).
 		    ///\return The lower bound for row \c r
 		    Value rowLowerBound(Row r) const {
 		      return _getRowLowerBound(rows(id(r)));
+		    }
 		    /// Set the upper bound of a row (i.e a constraint)
 		    /// The upper bound of a constraint (row) has to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or -\ref INF.
 		    void rowUpperBound(Row r, Value value) {
 		      _setRowUpperBound(rows(id(r)),value);
+		    }
 		    /// Get the upper bound of a row (i.e a constraint)
 		    /// This function returns the upper bound for row (constraint) \c c
 		    /// (this might be -\ref INF as well).
 		    ///\return The upper bound for row \c r
 		    Value rowUpperBound(Row r) const {
 		      return _getRowUpperBound(rows(id(r)));
+		    }
 		    ///Set an element of the objective function
-		    void objCoeff(Col c, Value v) {_setObjCoeff(_lpId(c),v); };
+		    void objCoeff(Col c, Value v) {_setObjCoeff(cols(id(c)),v); };
 		    ///Get an element of the objective function
-		    Value objCoeff(Col c) const { return _getObjCoeff(_lpId(c)); };
+		    Value objCoeff(Col c) const { return _getObjCoeff(cols(id(c))); };
 		    ///Set the objective function
 		    ///\param e is a linear expression of type \ref Expr.
 		    void obj(Expr e) {
 		      _clearObj();
 		      for (Expr::iterator i=e.begin(); i!=e.end(); ++i)
 		        objCoeff((*i).first,(*i).second);
-		      obj_const_comp=e.constComp();
+		    ///
 		    void obj(const Expr& e) {
 		      _setObjCoeffs(ExprIterator(e.comps.begin(), cols),
 		                    ExprIterator(e.comps.end(), cols));
 		      obj_const_comp = *e;
+		    }
 		    ///Get the objective function
-		    ///\return the objective function as a linear expression of type \ref Expr.
 		    ///\return the objective function as a linear expression of type
 		    ///Expr.
 		    Expr obj() const {
 		      Expr e;
 		      for (ColIt it(*this); it != INVALID; ++it) {
 		        double c = objCoeff(it);
 		        if (c != 0.0) {
 		          e.insert(std::make_pair(it, c));
+		        }
+		      }
 		      _getObjCoeffs(InsertIterator(e.comps, cols));
 		      *e = obj_const_comp;
 		      return e;
+		    }
 		    ///Maximize
 		    void max() { _setMax(); }
 		    ///Minimize
 		    void min() { _setMin(); }
 		    ///Set the direction of optimization
 		    void sense(Sense sense) { _setSense(sense); }
 		    ///Query function: is this a maximization problem?
 		    bool isMax() const {return _isMax(); }
 		    ///Query the direction of the optimization
 		    Sense sense() const {return _getSense(); }
 		    ///Query function: is this a minimization problem?
 		    bool isMin() const {return !isMax(); }
 		    ///Set the sense to maximization
 		    void max() { _setSense(MAX); }
 		    ///Set the sense to maximization
 		    void min() { _setSense(MIN); }
 		    ///Clears the problem
 		    void clear() { _clear(); }
 		    ///@}
 		  };
 		  /// Addition
 		  ///\relates LpBase::Expr
 		  ///
 		  inline LpBase::Expr operator+(const LpBase::Expr &a, const LpBase::Expr &b) {
 		    LpBase::Expr tmp(a);
 		    tmp+=b;
 		    return tmp;
+		  }
 		  ///Substraction
 		  ///\relates LpBase::Expr
 		  ///
 		  inline LpBase::Expr operator-(const LpBase::Expr &a, const LpBase::Expr &b) {
 		    LpBase::Expr tmp(a);
 		    tmp-=b;
 		    return tmp;
+		  }
 		  ///Multiply with constant
 		  ///\relates LpBase::Expr
 		  ///
 		  inline LpBase::Expr operator*(const LpBase::Expr &a, const LpBase::Value &b) {
 		    LpBase::Expr tmp(a);
 		    tmp*=b;
 		    return tmp;
+		  }
 		  ///Multiply with constant
 		  ///\relates LpBase::Expr
 		  ///
 		  inline LpBase::Expr operator*(const LpBase::Value &a, const LpBase::Expr &b) {
 		    LpBase::Expr tmp(b);
 		    tmp*=a;
 		    return tmp;
+		  }
 		  ///Divide with constant
 		  ///\relates LpBase::Expr
 		  ///
 		  inline LpBase::Expr operator/(const LpBase::Expr &a, const LpBase::Value &b) {
 		    LpBase::Expr tmp(a);
 		    tmp/=b;
 		    return tmp;
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator<=(const LpBase::Expr &e,
 		                                   const LpBase::Expr &f) {
 		    return LpBase::Constr(0, f - e, LpBase::INF);
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator<=(const LpBase::Value &e,
 		                                   const LpBase::Expr &f) {
 		    return LpBase::Constr(e, f, LpBase::NaN);
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator<=(const LpBase::Expr &e,
 		                                   const LpBase::Value &f) {
 		    return LpBase::Constr(- LpBase::INF, e, f);
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator>=(const LpBase::Expr &e,
 		                                   const LpBase::Expr &f) {
 		    return LpBase::Constr(0, e - f, LpBase::INF);
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator>=(const LpBase::Value &e,
 		                                   const LpBase::Expr &f) {
 		    return LpBase::Constr(LpBase::NaN, f, e);
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator>=(const LpBase::Expr &e,
 		                                   const LpBase::Value &f) {
 		    return LpBase::Constr(f, e, LpBase::INF);
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator==(const LpBase::Expr &e,
 		                                   const LpBase::Value &f) {
 		    return LpBase::Constr(f, e, f);
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator==(const LpBase::Expr &e,
 		                                   const LpBase::Expr &f) {
 		    return LpBase::Constr(0, f - e, 0);
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator<=(const LpBase::Value &n,
 		                                   const LpBase::Constr &c) {
 		    LpBase::Constr tmp(c);
 		    LEMON_ASSERT(std::isnan(tmp.lowerBound()), "Wrong LP constraint");
 		    tmp.lowerBound()=n;
 		    return tmp;
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator<=(const LpBase::Constr &c,
 		                                   const LpBase::Value &n)
+		  {
 		    LpBase::Constr tmp(c);
 		    LEMON_ASSERT(std::isnan(tmp.upperBound()), "Wrong LP constraint");
 		    tmp.upperBound()=n;
 		    return tmp;
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator>=(const LpBase::Value &n,
 		                                   const LpBase::Constr &c) {
 		    LpBase::Constr tmp(c);
 		    LEMON_ASSERT(std::isnan(tmp.upperBound()), "Wrong LP constraint");
 		    tmp.upperBound()=n;
 		    return tmp;
+		  }
 		  ///Create constraint
 		  ///\relates LpBase::Constr
 		  ///
 		  inline LpBase::Constr operator>=(const LpBase::Constr &c,
 		                                   const LpBase::Value &n)
+		  {
 		    LpBase::Constr tmp(c);
 		    LEMON_ASSERT(std::isnan(tmp.lowerBound()), "Wrong LP constraint");
 		    tmp.lowerBound()=n;
 		    return tmp;
+		  }
 		  ///Addition
 		  ///\relates LpBase::DualExpr
 		  ///
 		  inline LpBase::DualExpr operator+(const LpBase::DualExpr &a,
 		                                    const LpBase::DualExpr &b) {
 		    LpBase::DualExpr tmp(a);
 		    tmp+=b;
 		    return tmp;
+		  }
 		  ///Substraction
 		  ///\relates LpBase::DualExpr
 		  ///
 		  inline LpBase::DualExpr operator-(const LpBase::DualExpr &a,
 		                                    const LpBase::DualExpr &b) {
 		    LpBase::DualExpr tmp(a);
 		    tmp-=b;
 		    return tmp;
+		  }
 		  ///Multiply with constant
 		  ///\relates LpBase::DualExpr
 		  ///
 		  inline LpBase::DualExpr operator*(const LpBase::DualExpr &a,
 		                                    const LpBase::Value &b) {
 		    LpBase::DualExpr tmp(a);
 		    tmp*=b;
 		    return tmp;
+		  }
 		  ///Multiply with constant
 		  ///\relates LpBase::DualExpr
 		  ///
 		  inline LpBase::DualExpr operator*(const LpBase::Value &a,
 		                                    const LpBase::DualExpr &b) {
 		    LpBase::DualExpr tmp(b);
 		    tmp*=a;
 		    return tmp;
+		  }
 		  ///Divide with constant
 		  ///\relates LpBase::DualExpr
 		  ///
 		  inline LpBase::DualExpr operator/(const LpBase::DualExpr &a,
 		                                    const LpBase::Value &b) {
 		    LpBase::DualExpr tmp(a);
 		    tmp/=b;
 		    return tmp;
+		  }
 		  /// \ingroup lp_group
 		  ///
 		  /// \brief Common base class for LP solvers
 		  ///
 		  /// This class is an abstract base class for LP solvers. This class
 		  /// provides a full interface for set and modify an LP problem,
 		  /// solve it and retrieve the solution. You can use one of the
 		  /// descendants as a concrete implementation, or the \c Lp
 		  /// default LP solver. However, if you would like to handle LP
 		  /// solvers as reference or pointer in a generic way, you can use
 		  /// this class directly.
 		  class LpSolver : virtual public LpBase {
 		  public:
 		    /// The problem types for primal and dual problems
 		    enum ProblemType {
 		      ///Feasible solution hasn't been found (but may exist).
 		      UNDEFINED = 0,
 		      ///The problem has no feasible solution
 		      INFEASIBLE = 1,
 		      ///Feasible solution found
 		      FEASIBLE = 2,
 		      ///Optimal solution exists and found
 		      OPTIMAL = 3,
 		      ///The cost function is unbounded
 		      UNBOUNDED = 4
 		    };
 		    ///The basis status of variables
 		    enum VarStatus {
 		      /// The variable is in the basis
 		      BASIC,
 		      /// The variable is free, but not basic
 		      FREE,
 		      /// The variable has active lower bound
 		      LOWER,
 		      /// The variable has active upper bound
 		      UPPER,
 		      /// The variable is non-basic and fixed
 		      FIXED
 		    };
 		  protected:
 		    virtual SolveExitStatus _solve() = 0;
 		    virtual Value _getPrimal(int i) const = 0;
 		    virtual Value _getDual(int i) const = 0;
 		    virtual Value _getPrimalRay(int i) const = 0;
 		    virtual Value _getDualRay(int i) const = 0;
 		    virtual Value _getPrimalValue() const = 0;
 		    virtual VarStatus _getColStatus(int i) const = 0;
 		    virtual VarStatus _getRowStatus(int i) const = 0;
 		    virtual ProblemType _getPrimalType() const = 0;
 		    virtual ProblemType _getDualType() const = 0;
 		  public:
 		    ///\name Solve the LP
 		    ///@{
 		    ///\e Solve the LP problem at hand
 		    ///
 		    ///\return The result of the optimization procedure. Possible
 		    ///values and their meanings can be found in the documentation of
 		    ///\ref SolveExitStatus.
 		    ///
 		    ///\todo Which method is used to solve the problem
 		    SolveExitStatus solve() { return _solve(); }
 		    ///@}
 		    ///\name Obtain the solution
 		    ///@{
 		    /// The status of the primal problem (the original LP problem)
 		    SolutionStatus primalStatus() const {
-		      return _getPrimalStatus();
+		    /// The type of the primal problem
 		    ProblemType primalType() const {
 		      return _getPrimalType();
+		    }
 		    /// The status of the dual (of the original LP) problem
 		    SolutionStatus dualStatus() const {
-		      return _getDualStatus();
+		    /// The type of the dual problem
 		    ProblemType dualType() const {
 		      return _getDualType();
+		    }
 		    ///The type of the original LP problem
 		    ProblemTypes problemType() const {
-		      return _getProblemType();
+		    /// Return the primal value of the column
 		    /// Return the primal value of the column.
 		    /// \pre The problem is solved.
 		    Value primal(Col c) const { return _getPrimal(cols(id(c))); }
 		    /// Return the primal value of the expression
 		    /// Return the primal value of the expression, i.e. the dot
 		    /// product of the primal solution and the expression.
 		    /// \pre The problem is solved.
 		    Value primal(const Expr& e) const {
 		      double res = *e;
 		      for (Expr::ConstCoeffIt c(e); c != INVALID; ++c) {
 		        res += *c * primal(c);
+		    }
 		      return res;
+		    }
 		    /// Returns a component of the primal ray
 		    ///\e
 		    Value primal(Col c) const { return _getPrimal(_lpId(c)); }
 		    ///\e
 		    Value primal(const Expr& e) const {
 		      double res = e.constComp();
 		      for (std::map<Col, double>::const_iterator it = e.begin();
 		           it != e.end(); ++it) {
 		        res += _getPrimal(_lpId(it->first)) * it->second;
 		    /// The primal ray is solution of the modified primal problem,
 		    /// where we change each finite bound to 0, and we looking for a
 		    /// negative objective value in case of minimization, and positive
 		    /// objective value for maximization. If there is such solution,
 		    /// that proofs the unsolvability of the dual problem, and if a
 		    /// feasible primal solution exists, then the unboundness of
 		    /// primal problem.
 		    ///
 		    /// \pre The problem is solved and the dual problem is infeasible.
 		    /// \note Some solvers does not provide primal ray calculation
 		    /// functions.
 		    Value primalRay(Col c) const { return _getPrimalRay(cols(id(c))); }
 		    /// Return the dual value of the row
 		    /// Return the dual value of the row.
 		    /// \pre The problem is solved.
 		    Value dual(Row r) const { return _getDual(rows(id(r))); }
 		    /// Return the dual value of the dual expression
 		    /// Return the dual value of the dual expression, i.e. the dot
 		    /// product of the dual solution and the dual expression.
 		    /// \pre The problem is solved.
 		    Value dual(const DualExpr& e) const {
 		      double res = 0.0;
 		      for (DualExpr::ConstCoeffIt r(e); r != INVALID; ++r) {
 		        res += *r * dual(r);
+		      }
 		      return res;
+		    }
 		    ///\e
 		    Value dual(Row r) const { return _getDual(_lpId(r)); }
 		    ///\e
 		    Value dual(const DualExpr& e) const {
 		      double res = 0.0;
 		      for (std::map<Row, double>::const_iterator it = e.begin();
 		           it != e.end(); ++it) {
 		        res += _getPrimal(_lpId(it->first)) * it->second;
+		      }
 		      return res;
+		    }
+		    /// Returns a component of the dual ray
 		    ///\e
 		    bool isBasicCol(Col c) const { return _isBasicCol(_lpId(c)); }
 		    /// The dual ray is solution of the modified primal problem, where
 		    /// we change each finite bound to 0 (i.e. the objective function
 		    /// coefficients in the primal problem), and we looking for a
 		    /// ositive objective value. If there is such solution, that
 		    /// proofs the unsolvability of the primal problem, and if a
 		    /// feasible dual solution exists, then the unboundness of
 		    /// dual problem.
 		    ///
 		    /// \pre The problem is solved and the primal problem is infeasible.
 		    /// \note Some solvers does not provide dual ray calculation
 		    /// functions.
 		    Value dualRay(Row r) const { return _getDualRay(rows(id(r))); }
-		    ///\e
+		    /// Return the basis status of the column
 		    /// \see VarStatus
 		    VarStatus colStatus(Col c) const { return _getColStatus(cols(id(c))); }
 		    /// Return the basis status of the row
 		    /// \see VarStatus
 		    VarStatus rowStatus(Row r) const { return _getRowStatus(rows(id(r))); }
 		    ///The value of the objective function
 		    ///\return
 		    ///- \ref INF or -\ref INF means either infeasibility or unboundedness
 		    /// of the primal problem, depending on whether we minimize or maximize.
 		    ///- \ref NaN if no primal solution is found.
 		    ///- The (finite) objective value if an optimal solution is found.
-		    Value primalValue() const { return _getPrimalValue()+obj_const_comp;}
+		    Value primal() const { return _getPrimalValue()+obj_const_comp;}
 		    ///@}
 		    LpSolver* newSolver() {return _newSolver();}
 		    LpSolver* cloneSolver() {return _cloneSolver();}
 		  protected:
 		    virtual LpSolver* _newSolver() const = 0;
 		    virtual LpSolver* _cloneSolver() const = 0;
 		  };
 		  /// \ingroup lp_group
 		  ///
 		  /// \brief Common base class for MIP solvers
 		  /// \todo Much more docs
 		  class MipSolverBase : virtual public LpSolverBase{
 		  ///
 		  /// This class is an abstract base class for MIP solvers. This class
 		  /// provides a full interface for set and modify an MIP problem,
 		  /// solve it and retrieve the solution. You can use one of the
 		  /// descendants as a concrete implementation, or the \c Lp
 		  /// default MIP solver. However, if you would like to handle MIP
 		  /// solvers as reference or pointer in a generic way, you can use
 		  /// this class directly.
 		  class MipSolver : virtual public LpBase {
 		  public:
-		    ///Possible variable (coloumn) types (e.g. real, integer, binary etc.)
+		    /// The problem types for MIP problems
 		    enum ProblemType {
 		      ///Feasible solution hasn't been found (but may exist).
 		      UNDEFINED = 0,
 		      ///The problem has no feasible solution
 		      INFEASIBLE = 1,
 		      ///Feasible solution found
 		      FEASIBLE = 2,
 		      ///Optimal solution exists and found
 		      OPTIMAL = 3,
 		      ///The cost function is unbounded
 		      ///
 		      ///The Mip or at least the relaxed problem is unbounded
 		      UNBOUNDED = 4
 		    };
 		    ///\name Solve the MIP
 		    ///@{
 		    /// Solve the MIP problem at hand
 		    ///
 		    ///\return The result of the optimization procedure. Possible
 		    ///values and their meanings can be found in the documentation of
 		    ///\ref SolveExitStatus.
 		    SolveExitStatus solve() { return _solve(); }
 		    ///@}
 		    ///\name Setting column type
 		    ///@{
 		    ///Possible variable (column) types (e.g. real, integer, binary etc.)
 		    enum ColTypes {
 		      ///Continuous variable
+		      ///Continuous variable (default)
 		      REAL = 0,
 		      ///Integer variable
 		      ///Unfortunately, cplex 7.5 somewhere writes something like
 		      ///#define INTEGER 'I'
 		      INT = 1
-		      ///\todo No support for other types yet.
+		      INTEGER = 1
 		    };
-		    ///Sets the type of the given coloumn to the given type
+		    ///Sets the type of the given column to the given type
 		    ///Sets the type of the given column to the given type.
 		    ///
 		    ///Sets the type of the given coloumn to the given type.
 		    void colType(Col c, ColTypes col_type) {
-		      _colType(_lpId(c),col_type);
+		      _setColType(cols(id(c)),col_type);
+		    }
 		    ///Gives back the type of the column.
 		    ///Gives back the type of the column.
 		    ///
 		    ///Gives back the type of the column.
 		    ColTypes colType(Col c) const {
-		      return _colType(_lpId(c));
+		      return _getColType(cols(id(c)));
+		    }
 		    ///@}
 		    ///\name Obtain the solution
 		    ///@{
 		    /// The type of the MIP problem
 		    ProblemType type() const {
 		      return _getType();
+		    }
 		    ///Sets the type of the given Col to integer or remove that property.
 		    ///
 		    ///Sets the type of the given Col to integer or remove that property.
 		    void integer(Col c, bool enable) {
 		      if (enable)
 		        colType(c,INT);
 		      else
 		        colType(c,REAL);
 		    /// Return the value of the row in the solution
 		    ///  Return the value of the row in the solution.
 		    /// \pre The problem is solved.
 		    Value sol(Col c) const { return _getSol(cols(id(c))); }
 		    /// Return the value of the expression in the solution
 		    /// Return the value of the expression in the solution, i.e. the
 		    /// dot product of the solution and the expression.
 		    /// \pre The problem is solved.
 		    Value sol(const Expr& e) const {
 		      double res = *e;
 		      for (Expr::ConstCoeffIt c(e); c != INVALID; ++c) {
 		        res += *c * sol(c);
+		    }
 		      return res;
+		    }
 		    ///The value of the objective function
 		    ///Gives back whether the type of the column is integer or not.
 		    ///
 		    ///Gives back the type of the column.
 		    ///\return true if the column has integer type and false if not.
 		    bool integer(Col c) const {
 		      return (colType(c)==INT);
+		    }
 		    /// The status of the MIP problem
 		    SolutionStatus mipStatus() const {
 		      return _getMipStatus();
+		    }
 		    ///\return
 		    ///- \ref INF or -\ref INF means either infeasibility or unboundedness
 		    /// of the problem, depending on whether we minimize or maximize.
 		    ///- \ref NaN if no primal solution is found.
 		    ///- The (finite) objective value if an optimal solution is found.
 		    Value solValue() const { return _getSolValue()+obj_const_comp;}
 		    ///@}
 		  protected:
 		    virtual ColTypes _colType(int col) const = 0;
 		    virtual void _colType(int col, ColTypes col_type) = 0;
-		    virtual SolutionStatus _getMipStatus() const = 0;
+		    virtual SolveExitStatus _solve() = 0;
 		    virtual ColTypes _getColType(int col) const = 0;
 		    virtual void _setColType(int col, ColTypes col_type) = 0;
 		    virtual ProblemType _getType() const = 0;
 		    virtual Value _getSol(int i) const = 0;
 		    virtual Value _getSolValue() const = 0;
 		  public:
 		    MipSolver* newSolver() {return _newSolver();}
 		    MipSolver* cloneSolver() {return _cloneSolver();}
 		  protected:
 		    virtual MipSolver* _newSolver() const = 0;
 		    virtual MipSolver* _cloneSolver() const = 0;
 		  };
 		  ///\relates LpSolverBase::Expr
 		  ///
 		  inline LpSolverBase::Expr operator+(const LpSolverBase::Expr &a,
 		                                      const LpSolverBase::Expr &b)
+		  {
 		    LpSolverBase::Expr tmp(a);
 		    tmp+=b;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Expr
 		  ///
 		  inline LpSolverBase::Expr operator-(const LpSolverBase::Expr &a,
 		                                      const LpSolverBase::Expr &b)
+		  {
 		    LpSolverBase::Expr tmp(a);
 		    tmp-=b;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Expr
 		  ///
 		  inline LpSolverBase::Expr operator*(const LpSolverBase::Expr &a,
 		                                      const LpSolverBase::Value &b)
+		  {
 		    LpSolverBase::Expr tmp(a);
 		    tmp*=b;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Expr
 		  ///
 		  inline LpSolverBase::Expr operator*(const LpSolverBase::Value &a,
 		                                      const LpSolverBase::Expr &b)
+		  {
 		    LpSolverBase::Expr tmp(b);
 		    tmp*=a;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Expr
 		  ///
 		  inline LpSolverBase::Expr operator/(const LpSolverBase::Expr &a,
 		                                      const LpSolverBase::Value &b)
+		  {
 		    LpSolverBase::Expr tmp(a);
 		    tmp/=b;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator<=(const LpSolverBase::Expr &e,
 		                                         const LpSolverBase::Expr &f)
+		  {
 		    return LpSolverBase::Constr(-LpSolverBase::INF,e-f,0);
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator<=(const LpSolverBase::Value &e,
 		                                         const LpSolverBase::Expr &f)
+		  {
 		    return LpSolverBase::Constr(e,f);
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator<=(const LpSolverBase::Expr &e,
 		                                         const LpSolverBase::Value &f)
+		  {
 		    return LpSolverBase::Constr(-LpSolverBase::INF,e,f);
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator>=(const LpSolverBase::Expr &e,
 		                                         const LpSolverBase::Expr &f)
+		  {
 		    return LpSolverBase::Constr(-LpSolverBase::INF,f-e,0);
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator>=(const LpSolverBase::Value &e,
 		                                         const LpSolverBase::Expr &f)
+		  {
 		    return LpSolverBase::Constr(f,e);
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator>=(const LpSolverBase::Expr &e,
 		                                         const LpSolverBase::Value &f)
+		  {
 		    return LpSolverBase::Constr(f,e,LpSolverBase::INF);
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator==(const LpSolverBase::Expr &e,
 		                                         const LpSolverBase::Value &f)
+		  {
 		    return LpSolverBase::Constr(f,e,f);
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator==(const LpSolverBase::Expr &e,
 		                                         const LpSolverBase::Expr &f)
+		  {
 		    return LpSolverBase::Constr(0,e-f,0);
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator<=(const LpSolverBase::Value &n,
 		                                         const LpSolverBase::Constr&c)
+		  {
 		    LpSolverBase::Constr tmp(c);
 		    LEMON_ASSERT(LpSolverBase::isNaN(tmp.lowerBound()), "Wrong LP constraint");
 		    tmp.lowerBound()=n;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator<=(const LpSolverBase::Constr& c,
 		                                         const LpSolverBase::Value &n)
+		  {
 		    LpSolverBase::Constr tmp(c);
 		    LEMON_ASSERT(LpSolverBase::isNaN(tmp.upperBound()), "Wrong LP constraint");
 		    tmp.upperBound()=n;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator>=(const LpSolverBase::Value &n,
 		                                         const LpSolverBase::Constr&c)
+		  {
 		    LpSolverBase::Constr tmp(c);
 		    LEMON_ASSERT(LpSolverBase::isNaN(tmp.upperBound()), "Wrong LP constraint");
 		    tmp.upperBound()=n;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::Constr
 		  ///
 		  inline LpSolverBase::Constr operator>=(const LpSolverBase::Constr& c,
 		                                         const LpSolverBase::Value &n)
+		  {
 		    LpSolverBase::Constr tmp(c);
 		    LEMON_ASSERT(LpSolverBase::isNaN(tmp.lowerBound()), "Wrong LP constraint");
 		    tmp.lowerBound()=n;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::DualExpr
 		  ///
 		  inline LpSolverBase::DualExpr operator+(const LpSolverBase::DualExpr &a,
 		                                          const LpSolverBase::DualExpr &b)
+		  {
 		    LpSolverBase::DualExpr tmp(a);
 		    tmp+=b;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::DualExpr
 		  ///
 		  inline LpSolverBase::DualExpr operator-(const LpSolverBase::DualExpr &a,
 		                                          const LpSolverBase::DualExpr &b)
+		  {
 		    LpSolverBase::DualExpr tmp(a);
 		    tmp-=b;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::DualExpr
 		  ///
 		  inline LpSolverBase::DualExpr operator*(const LpSolverBase::DualExpr &a,
 		                                          const LpSolverBase::Value &b)
+		  {
 		    LpSolverBase::DualExpr tmp(a);
 		    tmp*=b;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::DualExpr
 		  ///
 		  inline LpSolverBase::DualExpr operator*(const LpSolverBase::Value &a,
 		                                          const LpSolverBase::DualExpr &b)
+		  {
 		    LpSolverBase::DualExpr tmp(b);
 		    tmp*=a;
 		    return tmp;
+		  }
 		  ///\e
 		  ///\relates LpSolverBase::DualExpr
 		  ///
 		  inline LpSolverBase::DualExpr operator/(const LpSolverBase::DualExpr &a,
 		                                          const LpSolverBase::Value &b)
+		  {
 		    LpSolverBase::DualExpr tmp(a);
 		    tmp/=b;
 		    return tmp;
+		  }
 		} //namespace lemon
 		#endif //LEMON_LP_BASE_H

lemon/lp_cplex.cc

Show inline comments

@@ -9,453 +9,604 @@
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#include <iostream>
 		#include <vector>
 		#include <cstring>
 		#include <lemon/lp_cplex.h>
 		extern "C" {
 		#include <ilcplex/cplex.h>
+		}
 		///\file
 		///\brief Implementation of the LEMON-CPLEX lp solver interface.
 		namespace lemon {
 		  LpCplex::LpCplex() {
 		    //    env = CPXopenCPLEXdevelop(&status);
 		    env = CPXopenCPLEX(&status);
 		    lp = CPXcreateprob(env, &status, "LP problem");
 		  CplexEnv::LicenseError::LicenseError(int status) {
 		    if (!CPXgeterrorstring(0, status, _message)) {
 		      std::strcpy(_message, "Cplex unknown error");
+		    }
+		  }
 		  LpCplex::LpCplex(const LpCplex& cplex) : LpSolverBase() {
 		    env = CPXopenCPLEX(&status);
-		    lp = CPXcloneprob(env, cplex.lp, &status);
+		  CplexEnv::CplexEnv() {
 		    int status;
 		    _cnt = new int;
 		    _env = CPXopenCPLEX(&status);
 		    if (_env == 0) {
 		      delete _cnt;
 		      _cnt = 0;
 		      throw LicenseError(status);
+		    }
+		  }
 		  CplexEnv::CplexEnv(const CplexEnv& other) {
 		    _env = other._env;
 		    _cnt = other._cnt;
 		    ++(*_cnt);
+		  }
 		  CplexEnv& CplexEnv::operator=(const CplexEnv& other) {
 		    _env = other._env;
 		    _cnt = other._cnt;
 		    ++(*_cnt);
 		    return *this;
+		  }
 		  CplexEnv::~CplexEnv() {
 		    --(*_cnt);
 		    if (*_cnt == 0) {
 		      delete _cnt;
 		      CPXcloseCPLEX(&_env);
+		    }
+		  }
 		  CplexBase::CplexBase() : LpBase() {
 		    int status;
 		    _prob = CPXcreateprob(cplexEnv(), &status, "Cplex problem");
+		  }
 		  CplexBase::CplexBase(const CplexEnv& env)
 		    : LpBase(), _env(env) {
 		    int status;
 		    _prob = CPXcreateprob(cplexEnv(), &status, "Cplex problem");
+		  }
 		  CplexBase::CplexBase(const CplexBase& cplex)
 		    : LpBase() {
 		    int status;
 		    _prob = CPXcloneprob(cplexEnv(), cplex._prob, &status);
 		    rows = cplex.rows;
 		    cols = cplex.cols;
+		  }
 		  LpCplex::~LpCplex() {
 		    CPXfreeprob(env,&lp);
-		    CPXcloseCPLEX(&env);
+		  CplexBase::~CplexBase() {
 		    CPXfreeprob(cplexEnv(),&_prob);
+		  }
 		  LpSolverBase* LpCplex::_newLp()
+		  {
 		    //The first approach opens a new environment
 		    return new LpCplex();
+		  }
 		  LpSolverBase* LpCplex::_copyLp() {
 		    return new LpCplex(*this);
+		  }
 		  int LpCplex::_addCol()
+		  {
 		    int i = CPXgetnumcols(env, lp);
 		    Value lb[1],ub[1];
 		    lb[0]=-INF;
 		    ub[0]=INF;
-		    status = CPXnewcols(env, lp, 1, NULL, lb, ub, NULL, NULL);
+		  int CplexBase::_addCol() {
 		    int i = CPXgetnumcols(cplexEnv(), _prob);
 		    double lb = -INF, ub = INF;
 		    CPXnewcols(cplexEnv(), _prob, 1, 0, &lb, &ub, 0, 0);
 		    return i;
+		  }
 		  int LpCplex::_addRow()
+		  {
 		    //We want a row that is not constrained
 		    char sense[1];
 		    sense[0]='L';//<= constraint
 		    Value rhs[1];
 		    rhs[0]=INF;
 		    int i = CPXgetnumrows(env, lp);
-		    status = CPXnewrows(env, lp, 1, rhs, sense, NULL, NULL);
+		  int CplexBase::_addRow() {
 		    int i = CPXgetnumrows(cplexEnv(), _prob);
 		    const double ub = INF;
 		    const char s = 'L';
 		    CPXnewrows(cplexEnv(), _prob, 1, &ub, &s, 0, 0);
 		    return i;
+		  }
 		  void LpCplex::_eraseCol(int i) {
 		    CPXdelcols(env, lp, i, i);
 		  void CplexBase::_eraseCol(int i) {
 		    CPXdelcols(cplexEnv(), _prob, i, i);
+		  }
 		  void LpCplex::_eraseRow(int i) {
 		    CPXdelrows(env, lp, i, i);
 		  void CplexBase::_eraseRow(int i) {
 		    CPXdelrows(cplexEnv(), _prob, i, i);
+		  }
 		  void LpCplex::_getColName(int col, std::string &name) const
+		  {
 		    ///\bug Untested
 		    int storespace;
 		    CPXgetcolname(env, lp, 0, 0, 0, &storespace, col, col);
 		    if (storespace == 0) {
 		  void CplexBase::_eraseColId(int i) {
 		    cols.eraseIndex(i);
 		    cols.shiftIndices(i);
+		  }
 		  void CplexBase::_eraseRowId(int i) {
 		    rows.eraseIndex(i);
 		    rows.shiftIndices(i);
+		  }
 		  void CplexBase::_getColName(int col, std::string &name) const {
 		    int size;
 		    CPXgetcolname(cplexEnv(), _prob, 0, 0, 0, &size, col, col);
 		    if (size == 0) {
 		      name.clear();
 		      return;
+		    }
 		    storespace *= -1;
 		    std::vector<char> buf(storespace);
 		    char *names[1];
 		    int dontcare;
 		    ///\bug return code unchecked for error
 		    CPXgetcolname(env, lp, names, &*buf.begin(), storespace,
 		                  &dontcare, col, col);
 		    name = names[0];
 		    size *= -1;
 		    std::vector<char> buf(size);
 		    char *cname;
 		    int tmp;
 		    CPXgetcolname(cplexEnv(), _prob, &cname, &buf.front(), size,
 		                  &tmp, col, col);
 		    name = cname;
+		  }
 		  void LpCplex::_setColName(int col, const std::string &name)
+		  {
 		    ///\bug Untested
 		    char *names[1];
 		    names[0] = const_cast<char*>(name.c_str());
 		    ///\bug return code unchecked for error
-		    CPXchgcolname(env, lp, 1, &col, names);
+		  void CplexBase::_setColName(int col, const std::string &name) {
 		    char *cname;
 		    cname = const_cast<char*>(name.c_str());
 		    CPXchgcolname(cplexEnv(), _prob, 1, &col, &cname);
+		  }
 		  int LpCplex::_colByName(const std::string& name) const
+		  {
 		  int CplexBase::_colByName(const std::string& name) const {
 		    int index;
-		    if (CPXgetcolindex(env, lp,
+		    if (CPXgetcolindex(cplexEnv(), _prob,
 		                       const_cast<char*>(name.c_str()), &index) == 0) {
 		      return index;
+		    }
 		    return -1;
+		  }
 		  ///\warning Data at index 0 is ignored in the arrays.
 		  void LpCplex::_setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e)
 		  void CplexBase::_getRowName(int row, std::string &name) const {
 		    int size;
 		    CPXgetrowname(cplexEnv(), _prob, 0, 0, 0, &size, row, row);
 		    if (size == 0) {
 		      name.clear();
 		      return;
+		    }
 		    size *= -1;
 		    std::vector<char> buf(size);
 		    char *cname;
 		    int tmp;
 		    CPXgetrowname(cplexEnv(), _prob, &cname, &buf.front(), size,
 		                  &tmp, row, row);
 		    name = cname;
+		  }
 		  void CplexBase::_setRowName(int row, const std::string &name) {
 		    char *cname;
 		    cname = const_cast<char*>(name.c_str());
 		    CPXchgrowname(cplexEnv(), _prob, 1, &row, &cname);
+		  }
 		  int CplexBase::_rowByName(const std::string& name) const {
 		    int index;
 		    if (CPXgetrowindex(cplexEnv(), _prob,
 		                       const_cast<char*>(name.c_str()), &index) == 0) {
 		      return index;
+		    }
 		    return -1;
+		  }
 		  void CplexBase::_setRowCoeffs(int i, ExprIterator b,
 		                                      ExprIterator e)
+		  {
 		    std::vector<int> indices;
 		    std::vector<int> rowlist;
 		    std::vector<Value> values;
-		    for(ConstRowIterator it=b; it!=e; ++it) {
+		    for(ExprIterator it=b; it!=e; ++it) {
 		      indices.push_back(it->first);
 		      values.push_back(it->second);
 		      rowlist.push_back(i);
+		    }
 		    status = CPXchgcoeflist(env, lp, values.size(),
 		                            &rowlist[0], &indices[0], &values[0]);
 		    CPXchgcoeflist(cplexEnv(), _prob, values.size(),
 		                   &rowlist.front(), &indices.front(), &values.front());
+		  }
-		  void LpCplex::_getRowCoeffs(int i, RowIterator b) const {
+		  void CplexBase::_getRowCoeffs(int i, InsertIterator b) const {
 		    int tmp1, tmp2, tmp3, length;
-		    CPXgetrows(env, lp, &tmp1, &tmp2, 0, 0, 0, &length, i, i);
+		    CPXgetrows(cplexEnv(), _prob, &tmp1, &tmp2, 0, 0, 0, &length, i, i);
 		    length = -length;
 		    std::vector<int> indices(length);
 		    std::vector<double> values(length);
-		    CPXgetrows(env, lp, &tmp1, &tmp2, &indices[0], &values[0],
+		    CPXgetrows(cplexEnv(), _prob, &tmp1, &tmp2,
 		               &indices.front(), &values.front(),
 		               length, &tmp3, i, i);
 		    for (int i = 0; i < length; ++i) {
 		      *b = std::make_pair(indices[i], values[i]);
 		      ++b;
+		    }
 		    /// \todo implement
+		  }
 		  void LpCplex::_setColCoeffs(int i, ConstColIterator b, ConstColIterator e)
+		  {
 		  void CplexBase::_setColCoeffs(int i, ExprIterator b, ExprIterator e) {
 		    std::vector<int> indices;
 		    std::vector<int> collist;
 		    std::vector<Value> values;
-		    for(ConstColIterator it=b; it!=e; ++it) {
+		    for(ExprIterator it=b; it!=e; ++it) {
 		      indices.push_back(it->first);
 		      values.push_back(it->second);
 		      collist.push_back(i);
+		    }
 		    status = CPXchgcoeflist(env, lp, values.size(),
 		                            &indices[0], &collist[0], &values[0]);
 		    CPXchgcoeflist(cplexEnv(), _prob, values.size(),
 		                   &indices.front(), &collist.front(), &values.front());
+		  }
-		  void LpCplex::_getColCoeffs(int i, ColIterator b) const {
+		  void CplexBase::_getColCoeffs(int i, InsertIterator b) const {
 		    int tmp1, tmp2, tmp3, length;
-		    CPXgetcols(env, lp, &tmp1, &tmp2, 0, 0, 0, &length, i, i);
+		    CPXgetcols(cplexEnv(), _prob, &tmp1, &tmp2, 0, 0, 0, &length, i, i);
 		    length = -length;
 		    std::vector<int> indices(length);
 		    std::vector<double> values(length);
-		    CPXgetcols(env, lp, &tmp1, &tmp2, &indices[0], &values[0],
+		    CPXgetcols(cplexEnv(), _prob, &tmp1, &tmp2,
 		               &indices.front(), &values.front(),
 		               length, &tmp3, i, i);
 		    for (int i = 0; i < length; ++i) {
 		      *b = std::make_pair(indices[i], values[i]);
 		      ++b;
+		    }
+		  }
 		  void LpCplex::_setCoeff(int row, int col, Value value)
+		  {
-		    CPXchgcoef(env, lp, row, col, value);
+		  void CplexBase::_setCoeff(int row, int col, Value value) {
 		    CPXchgcoef(cplexEnv(), _prob, row, col, value);
+		  }
 		  LpCplex::Value LpCplex::_getCoeff(int row, int col) const
+		  {
 		    LpCplex::Value value;
 		    CPXgetcoef(env, lp, row, col, &value);
 		  CplexBase::Value CplexBase::_getCoeff(int row, int col) const {
 		    CplexBase::Value value;
 		    CPXgetcoef(cplexEnv(), _prob, row, col, &value);
 		    return value;
+		  }
-		  void LpCplex::_setColLowerBound(int i, Value value)
+		  void CplexBase::_setColLowerBound(int i, Value value) {
 		    const char s = 'L';
 		    CPXchgbds(cplexEnv(), _prob, 1, &i, &s, &value);
+		  }
 		  CplexBase::Value CplexBase::_getColLowerBound(int i) const {
 		    CplexBase::Value res;
 		    CPXgetlb(cplexEnv(), _prob, &res, i, i);
 		    return res <= -CPX_INFBOUND ? -INF : res;
+		  }
 		  void CplexBase::_setColUpperBound(int i, Value value)
+		  {
 		    int indices[1];
 		    indices[0]=i;
 		    char lu[1];
 		    lu[0]='L';
 		    Value bd[1];
 		    bd[0]=value;
-		    status = CPXchgbds(env, lp, 1, indices, lu, bd);
+		    const char s = 'U';
 		    CPXchgbds(cplexEnv(), _prob, 1, &i, &s, &value);
+		  }
 		  CplexBase::Value CplexBase::_getColUpperBound(int i) const {
 		    CplexBase::Value res;
 		    CPXgetub(cplexEnv(), _prob, &res, i, i);
 		    return res >= CPX_INFBOUND ? INF : res;
+		  }
 		  CplexBase::Value CplexBase::_getRowLowerBound(int i) const {
 		    char s;
 		    CPXgetsense(cplexEnv(), _prob, &s, i, i);
 		    CplexBase::Value res;
 		    switch (s) {
 		    case 'G':
 		    case 'R':
 		    case 'E':
 		      CPXgetrhs(cplexEnv(), _prob, &res, i, i);
 		      return res <= -CPX_INFBOUND ? -INF : res;
 		    default:
 		      return -INF;
+		    }
+		  }
 		  CplexBase::Value CplexBase::_getRowUpperBound(int i) const {
 		    char s;
 		    CPXgetsense(cplexEnv(), _prob, &s, i, i);
 		    CplexBase::Value res;
 		    switch (s) {
 		    case 'L':
 		    case 'E':
 		      CPXgetrhs(cplexEnv(), _prob, &res, i, i);
 		      return res >= CPX_INFBOUND ? INF : res;
 		    case 'R':
 		      CPXgetrhs(cplexEnv(), _prob, &res, i, i);
+		      {
 		        double rng;
 		        CPXgetrngval(cplexEnv(), _prob, &rng, i, i);
 		        res += rng;
+		      }
 		      return res >= CPX_INFBOUND ? INF : res;
 		    default:
 		      return INF;
+		    }
+		  }
 		  //This is easier to implement
 		  void CplexBase::_set_row_bounds(int i, Value lb, Value ub) {
 		    if (lb == -INF) {
 		      const char s = 'L';
 		      CPXchgsense(cplexEnv(), _prob, 1, &i, &s);
 		      CPXchgrhs(cplexEnv(), _prob, 1, &i, &ub);
 		    } else if (ub == INF) {
 		      const char s = 'G';
 		      CPXchgsense(cplexEnv(), _prob, 1, &i, &s);
 		      CPXchgrhs(cplexEnv(), _prob, 1, &i, &lb);
 		    } else if (lb == ub){
 		      const char s = 'E';
 		      CPXchgsense(cplexEnv(), _prob, 1, &i, &s);
 		      CPXchgrhs(cplexEnv(), _prob, 1, &i, &lb);
 		    } else {
 		      const char s = 'R';
 		      CPXchgsense(cplexEnv(), _prob, 1, &i, &s);
 		      CPXchgrhs(cplexEnv(), _prob, 1, &i, &lb);
 		      double len = ub - lb;
 		      CPXchgrngval(cplexEnv(), _prob, 1, &i, &len);
+		    }
+		  }
 		  void CplexBase::_setRowLowerBound(int i, Value lb)
+		  {
 		    LEMON_ASSERT(lb != INF, "Invalid bound");
 		    _set_row_bounds(i, lb, CplexBase::_getRowUpperBound(i));
+		  }
 		  void CplexBase::_setRowUpperBound(int i, Value ub)
+		  {
 		    LEMON_ASSERT(ub != -INF, "Invalid bound");
 		    _set_row_bounds(i, CplexBase::_getRowLowerBound(i), ub);
+		  }
 		  void CplexBase::_setObjCoeffs(ExprIterator b, ExprIterator e)
+		  {
 		    std::vector<int> indices;
 		    std::vector<Value> values;
 		    for(ExprIterator it=b; it!=e; ++it) {
 		      indices.push_back(it->first);
 		      values.push_back(it->second);
+		    }
 		    CPXchgobj(cplexEnv(), _prob, values.size(),
 		              &indices.front(), &values.front());
+		  }
-		  LpCplex::Value LpCplex::_getColLowerBound(int i) const
+		  void CplexBase::_getObjCoeffs(InsertIterator b) const
+		  {
 		    LpCplex::Value x;
 		    CPXgetlb (env, lp, &x, i, i);
-		    if (x <= -CPX_INFBOUND) x = -INF;
+		    int num = CPXgetnumcols(cplexEnv(), _prob);
 		    std::vector<Value> x(num);
 		    CPXgetobj(cplexEnv(), _prob, &x.front(), 0, num - 1);
 		    for (int i = 0; i < num; ++i) {
 		      if (x[i] != 0.0) {
 		        *b = std::make_pair(i, x[i]);
 		        ++b;
+		      }
+		    }
+		  }
 		  void CplexBase::_setObjCoeff(int i, Value obj_coef)
+		  {
 		    CPXchgobj(cplexEnv(), _prob, 1, &i, &obj_coef);
+		  }
 		  CplexBase::Value CplexBase::_getObjCoeff(int i) const
+		  {
 		    Value x;
 		    CPXgetobj(cplexEnv(), _prob, &x, i, i);
 		    return x;
+		  }
 		  void LpCplex::_setColUpperBound(int i, Value value)
+		  {
 		    int indices[1];
 		    indices[0]=i;
 		    char lu[1];
 		    lu[0]='U';
 		    Value bd[1];
 		    bd[0]=value;
-		    status = CPXchgbds(env, lp, 1, indices, lu, bd);
+		  void CplexBase::_setSense(CplexBase::Sense sense) {
 		    switch (sense) {
 		    case MIN:
 		      CPXchgobjsen(cplexEnv(), _prob, CPX_MIN);
 		      break;
 		    case MAX:
 		      CPXchgobjsen(cplexEnv(), _prob, CPX_MAX);
 		      break;
+		    }
+		  }
 		  LpCplex::Value LpCplex::_getColUpperBound(int i) const
+		  {
 		    LpCplex::Value x;
 		    CPXgetub (env, lp, &x, i, i);
 		    if (x >= CPX_INFBOUND) x = INF;
 		    return x;
 		  CplexBase::Sense CplexBase::_getSense() const {
 		    switch (CPXgetobjsen(cplexEnv(), _prob)) {
 		    case CPX_MIN:
 		      return MIN;
 		    case CPX_MAX:
 		      return MAX;
 		    default:
 		      LEMON_ASSERT(false, "Invalid sense");
 		      return CplexBase::Sense();
+		    }
+		  }
 		  //This will be easier to implement
 		  void LpCplex::_setRowBounds(int i, Value lb, Value ub)
+		  {
 		    //Bad parameter
 		    if (lb==INF || ub==-INF) {
 		      //FIXME error
 		  void CplexBase::_clear() {
 		    CPXfreeprob(cplexEnv(),&_prob);
 		    int status;
 		    _prob = CPXcreateprob(cplexEnv(), &status, "Cplex problem");
 		    rows.clear();
 		    cols.clear();
+		    }
 		    int cnt=1;
 		    int indices[1];
 		    indices[0]=i;
 		    char sense[1];
 		  // LpCplex members
 		    if (lb==-INF){
 		      sense[0]='L';
 		      CPXchgsense(env, lp, cnt, indices, sense);
 		      CPXchgcoef(env, lp, i, -1, ub);
 		  LpCplex::LpCplex()
 		    : LpBase(), CplexBase(), LpSolver() {}
+		    }
 		    else{
 		      if (ub==INF){
 		        sense[0]='G';
 		        CPXchgsense(env, lp, cnt, indices, sense);
 		        CPXchgcoef(env, lp, i, -1, lb);
+		      }
 		      else{
 		        if (lb == ub){
 		          sense[0]='E';
 		          CPXchgsense(env, lp, cnt, indices, sense);
 		          CPXchgcoef(env, lp, i, -1, lb);
+		        }
 		        else{
 		          sense[0]='R';
 		          CPXchgsense(env, lp, cnt, indices, sense);
 		          CPXchgcoef(env, lp, i, -1, lb);
 		          CPXchgcoef(env, lp, i, -2, ub-lb);
+		        }
+		      }
+		    }
+		  LpCplex::LpCplex(const CplexEnv& env)
 		    : LpBase(), CplexBase(env), LpSolver() {}
 		  LpCplex::LpCplex(const LpCplex& other)
 		    : LpBase(), CplexBase(other), LpSolver() {}
 		  LpCplex::~LpCplex() {}
 		  LpCplex* LpCplex::_newSolver() const { return new LpCplex; }
 		  LpCplex* LpCplex::_cloneSolver() const {return new LpCplex(*this); }
 		  const char* LpCplex::_solverName() const { return "LpCplex"; }
 		  void LpCplex::_clear_temporals() {
 		    _col_status.clear();
 		    _row_status.clear();
 		    _primal_ray.clear();
 		    _dual_ray.clear();
+		  }
 		//   void LpCplex::_setRowLowerBound(int i, Value value)
 		//   {
 		//     //Not implemented, obsolete
 		//   }
 		//   void LpCplex::_setRowUpperBound(int i, Value value)
 		//   {
 		//     //Not implemented, obsolete
 		// //     //TODO Ezt kell meg megirni
 		// //     //type of the problem
 		// //     char sense[1];
 		// //     status = CPXgetsense(env, lp, sense, i, i);
 		// //     Value rhs[1];
 		// //     status = CPXgetrhs(env, lp, rhs, i, i);
 		// //     switch (sense[0]) {
 		// //     case 'L'://<= constraint
 		// //       break;
 		// //     case 'E'://= constraint
 		// //       break;
 		// //     case 'G'://>= constraint
 		// //       break;
 		// //     case 'R'://ranged constraint
 		// //       break;
 		// //     default: ;
 		// //       //FIXME error
 		// //     }
 		// //     status = CPXchgcoef(env, lp, i, -2, value_rng);
 		//   }
 		  void LpCplex::_getRowBounds(int i, Value &lb, Value &ub) const
+		  {
 		    char sense;
 		    CPXgetsense(env, lp, &sense,i,i);
 		    lb=-INF;
 		    ub=INF;
 		    switch (sense)
+		      {
 		      case 'L':
 		        CPXgetcoef(env, lp, i, -1, &ub);
 		        break;
 		      case 'G':
 		        CPXgetcoef(env, lp, i, -1, &lb);
 		        break;
 		      case 'E':
 		        CPXgetcoef(env, lp, i, -1, &lb);
 		        ub=lb;
 		        break;
 		      case 'R':
 		        CPXgetcoef(env, lp, i, -1, &lb);
 		        Value x;
 		        CPXgetcoef(env, lp, i, -2, &x);
 		        ub=lb+x;
 		        break;
+		      }
+		  }
 		  void LpCplex::_setObjCoeff(int i, Value obj_coef)
+		  {
 		    CPXchgcoef(env, lp, -1, i, obj_coef);
+		  }
 		  LpCplex::Value LpCplex::_getObjCoeff(int i) const
+		  {
 		    Value x;
 		    CPXgetcoef(env, lp, -1, i, &x);
 		    return x;
+		  }
 		  void LpCplex::_clearObj()
+		  {
 		    for (int i=0;i< CPXgetnumcols(env, lp);++i){
 		      CPXchgcoef(env, lp, -1, i, 0);
+		    }
+		  }
 		  // The routine returns zero unless an error occurred during the
 		  // optimization. Examples of errors include exhausting available
 		  // memory (CPXERR_NO_MEMORY) or encountering invalid data in the
 		  // CPLEX problem object (CPXERR_NO_PROBLEM). Exceeding a
 		  // user-specified CPLEX limit, or proving the model infeasible or
 		  // unbounded, are not considered errors. Note that a zero return
 		  // value does not necessarily mean that a solution exists. Use query
 		  // routines CPXsolninfo, CPXgetstat, and CPXsolution to obtain
 		  // further information about the status of the optimization.
 		  LpCplex::SolveExitStatus LpCplex::_solve()
+		  {
 		    //CPX_PARAM_LPMETHOD
 		    status = CPXlpopt(env, lp);
-		    //status = CPXprimopt(env, lp);
+		  LpCplex::SolveExitStatus LpCplex::convertStatus(int status) {
 		#if CPX_VERSION >= 800
 		    if (status)
+		    {
 		      return UNSOLVED;
+		    }
 		    else
+		    {
 		      switch (CPXgetstat(env, lp))
+		      {
 		    if (status == 0) {
 		      switch (CPXgetstat(cplexEnv(), _prob)) {
 		        case CPX_STAT_OPTIMAL:
 		        case CPX_STAT_INFEASIBLE:
 		        case CPX_STAT_UNBOUNDED:
 		          return SOLVED;
 		        default:
 		          return UNSOLVED;
+		      }
 		    } else {
 		      return UNSOLVED;
+		    }
 		#else
 		    if (status == 0){
 		      //We want to exclude some cases
-		      switch (CPXgetstat(env, lp)){
+		      switch (CPXgetstat(cplexEnv(), _prob)) {
 		      case CPX_OBJ_LIM:
 		      case CPX_IT_LIM_FEAS:
 		      case CPX_IT_LIM_INFEAS:
 		      case CPX_TIME_LIM_FEAS:
 		      case CPX_TIME_LIM_INFEAS:
 		        return UNSOLVED;
 		      default:
 		        return SOLVED;
+		      }
+		    }
 		    else{
 		    } else {
 		      return UNSOLVED;
+		    }
 		#endif
+		  }
 		  LpCplex::Value LpCplex::_getPrimal(int i) const
+		  {
 		  LpCplex::SolveExitStatus LpCplex::_solve() {
 		    _clear_temporals();
 		    return convertStatus(CPXlpopt(cplexEnv(), _prob));
+		  }
 		  LpCplex::SolveExitStatus LpCplex::solvePrimal() {
 		    _clear_temporals();
 		    return convertStatus(CPXprimopt(cplexEnv(), _prob));
+		  }
 		  LpCplex::SolveExitStatus LpCplex::solveDual() {
 		    _clear_temporals();
 		    return convertStatus(CPXdualopt(cplexEnv(), _prob));
+		  }
 		  LpCplex::SolveExitStatus LpCplex::solveBarrier() {
 		    _clear_temporals();
 		    return convertStatus(CPXbaropt(cplexEnv(), _prob));
+		  }
 		  LpCplex::Value LpCplex::_getPrimal(int i) const {
 		    Value x;
-		    CPXgetx(env, lp, &x, i, i);
+		    CPXgetx(cplexEnv(), _prob, &x, i, i);
 		    return x;
+		  }
 		  LpCplex::Value LpCplex::_getDual(int i) const
+		  {
 		  LpCplex::Value LpCplex::_getDual(int i) const {
 		    Value y;
-		    CPXgetpi(env, lp, &y, i, i);
+		    CPXgetpi(cplexEnv(), _prob, &y, i, i);
 		    return y;
+		  }
 		  LpCplex::Value LpCplex::_getPrimalValue() const
+		  {
 		  LpCplex::Value LpCplex::_getPrimalValue() const {
 		    Value objval;
 		    //method = CPXgetmethod (env, lp);
 		    //printf("CPXgetprobtype %d \n",CPXgetprobtype(env,lp));
 		    CPXgetobjval(env, lp, &objval);
 		    //printf("Objective value: %g \n",objval);
 		    CPXgetobjval(cplexEnv(), _prob, &objval);
 		    return objval;
+		  }
-		  bool LpCplex::_isBasicCol(int i) const
 		  LpCplex::VarStatus LpCplex::_getColStatus(int i) const {
 		    if (_col_status.empty()) {
 		      _col_status.resize(CPXgetnumcols(cplexEnv(), _prob));
 		      CPXgetbase(cplexEnv(), _prob, &_col_status.front(), 0);
+		    }
 		    switch (_col_status[i]) {
 		    case CPX_BASIC:
 		      return BASIC;
 		    case CPX_FREE_SUPER:
 		      return FREE;
 		    case CPX_AT_LOWER:
 		      return LOWER;
 		    case CPX_AT_UPPER:
 		      return UPPER;
 		    default:
 		      LEMON_ASSERT(false, "Wrong column status");
 		      return LpCplex::VarStatus();
+		    }
+		  }
 		  LpCplex::VarStatus LpCplex::_getRowStatus(int i) const {
 		    if (_row_status.empty()) {
 		      _row_status.resize(CPXgetnumrows(cplexEnv(), _prob));
 		      CPXgetbase(cplexEnv(), _prob, 0, &_row_status.front());
+		    }
 		    switch (_row_status[i]) {
 		    case CPX_BASIC:
 		      return BASIC;
 		    case CPX_AT_LOWER:
+		  {
 		    std::vector<int> cstat(CPXgetnumcols(env, lp));
 		    CPXgetbase(env, lp, &*cstat.begin(), NULL);
-		    return (cstat[i]==CPX_BASIC);
+		        char s;
 		        CPXgetsense(cplexEnv(), _prob, &s, i, i);
 		        return s != 'L' ? LOWER : UPPER;
+		      }
 		    case CPX_AT_UPPER:
 		      return UPPER;
 		    default:
 		      LEMON_ASSERT(false, "Wrong row status");
 		      return LpCplex::VarStatus();
+		    }
+		  }
 		  LpCplex::Value LpCplex::_getPrimalRay(int i) const {
 		    if (_primal_ray.empty()) {
 		      _primal_ray.resize(CPXgetnumcols(cplexEnv(), _prob));
 		      CPXgetray(cplexEnv(), _prob, &_primal_ray.front());
+		    }
 		    return _primal_ray[i];
+		  }
 		  LpCplex::Value LpCplex::_getDualRay(int i) const {
 		    if (_dual_ray.empty()) {
+		    }
 		    return _dual_ray[i];
+		  }
 		//7.5-os cplex statusai (Vigyazat: a 9.0-asei masok!)
 		// This table lists the statuses, returned by the CPXgetstat()
 		// routine, for solutions to LP problems or mixed integer problems. If
 		// no solution exists, the return value is zero.
 		// For Simplex, Barrier
 		// 1          CPX_OPTIMAL
 		//          Optimal solution found
 		// 2          CPX_INFEASIBLE
 		//          Problem infeasible
@@ -495,106 +646,105 @@
 		//          Infeasible or unbounded
 		// 20   CPX_PIVOT
 		//       User pivot used
 		//
 		//     Ezeket hova tegyem:
 		// ??case CPX_ABORT_DUAL_INFEAS
 		// ??case CPX_ABORT_CROSSOVER
 		// ??case CPX_INForUNBD
 		// ??case CPX_PIVOT
 		//Some more interesting stuff:
-		// CPX_PARAM_LPMETHOD  1062  int  LPMETHOD
+		  // CPX_PARAM_PROBMETHOD  1062  int  LPMETHOD
 		// 0 Automatic
 		// 1 Primal Simplex
 		// 2 Dual Simplex
 		// 3 Network Simplex
 		// 4 Standard Barrier
 		// Default: 0
 		// Description: Method for linear optimization.
 		// Determines which algorithm is used when CPXlpopt() (or "optimize"
 		// in the Interactive Optimizer) is called. Currently the behavior of
 		// the "Automatic" setting is that CPLEX simply invokes the dual
 		// simplex method, but this capability may be expanded in the future
 		// so that CPLEX chooses the method based on problem characteristics
 		#if CPX_VERSION < 900
-		  void statusSwitch(CPXENVptr env,int& stat){
+		  void statusSwitch(CPXENVptr cplexEnv(),int& stat){
 		    int lpmethod;
-		    CPXgetintparam (env,CPX_PARAM_LPMETHOD,&lpmethod);
+		    CPXgetintparam (cplexEnv(),CPX_PARAM_PROBMETHOD,&lpmethod);
 		    if (lpmethod==2){
 		      if (stat==CPX_UNBOUNDED){
 		        stat=CPX_INFEASIBLE;
+		      }
 		      else{
 		        if (stat==CPX_INFEASIBLE)
 		          stat=CPX_UNBOUNDED;
+		      }
+		    }
+		  }
 		#else
 		  void statusSwitch(CPXENVptr,int&){}
 		#endif
 		  LpCplex::SolutionStatus LpCplex::_getPrimalStatus() const
+		  {
 		  LpCplex::ProblemType LpCplex::_getPrimalType() const {
 		    //Unboundedness not treated well: the following is from cplex 9.0 doc
 		    // About Unboundedness
 		    // The treatment of models that are unbounded involves a few
 		    // subtleties. Specifically, a declaration of unboundedness means that
 		    // ILOG CPLEX has determined that the model has an unbounded
 		    // ray. Given any feasible solution x with objective z, a multiple of
 		    // the unbounded ray can be added to x to give a feasible solution
 		    // with objective z-1 (or z+1 for maximization models). Thus, if a
 		    // feasible solution exists, then the optimal objective is
 		    // unbounded. Note that ILOG CPLEX has not necessarily concluded that
 		    // a feasible solution exists. Users can call the routine CPXsolninfo
 		    // to determine whether ILOG CPLEX has also concluded that the model
 		    // has a feasible solution.
-		    int stat = CPXgetstat(env, lp);
+		    int stat = CPXgetstat(cplexEnv(), _prob);
 		#if CPX_VERSION >= 800
 		    switch (stat)
+		    {
 		      case CPX_STAT_OPTIMAL:
 		        return OPTIMAL;
 		      case CPX_STAT_UNBOUNDED:
-		        return INFINITE;
+		        return UNBOUNDED;
 		      case CPX_STAT_INFEASIBLE:
 		        return INFEASIBLE;
 		      default:
 		        return UNDEFINED;
+		    }
 		#else
 		    statusSwitch(env,stat);
 		    //CPXgetstat(env, lp);
 		    statusSwitch(cplexEnv(),stat);
 		    //CPXgetstat(cplexEnv(), _prob);
 		    //printf("A primal status: %d, CPX_OPTIMAL=%d \n",stat,CPX_OPTIMAL);
 		    switch (stat) {
 		    case 0:
 		      return UNDEFINED; //Undefined
 		    case CPX_OPTIMAL://Optimal
 		      return OPTIMAL;
 		    case CPX_UNBOUNDED://Unbounded
 		      return INFEASIBLE;//In case of dual simplex
-		      //return INFINITE;
+		      //return UNBOUNDED;
 		    case CPX_INFEASIBLE://Infeasible
 		 //    case CPX_IT_LIM_INFEAS:
 		//     case CPX_TIME_LIM_INFEAS:
 		//     case CPX_NUM_BEST_INFEAS:
 		//     case CPX_OPTIMAL_INFEAS:
 		//     case CPX_ABORT_INFEAS:
 		//     case CPX_ABORT_PRIM_INFEAS:
 		//     case CPX_ABORT_PRIM_DUAL_INFEAS:
-		      return INFINITE;//In case of dual simplex
+		      return UNBOUNDED;//In case of dual simplex
 		      //return INFEASIBLE;
 		//     case CPX_OBJ_LIM:
 		//     case CPX_IT_LIM_FEAS:
 		//     case CPX_TIME_LIM_FEAS:
 		//     case CPX_NUM_BEST_FEAS:
 		//     case CPX_ABORT_FEAS:
 		//     case CPX_ABORT_PRIM_DUAL_FEAS:
 		//       return FEASIBLE;
 		    default:
 		      return UNDEFINED; //Everything else comes here
 		      //FIXME error
+		    }
@@ -609,91 +759,167 @@
 		// CPX_STAT_ABORT_TIME_LIM
 		// CPX_STAT_ABORT_USER
 		// CPX_STAT_FEASIBLE_RELAXED
 		// CPX_STAT_INFEASIBLE
 		// CPX_STAT_INForUNBD
 		// CPX_STAT_NUM_BEST
 		// CPX_STAT_OPTIMAL
 		// CPX_STAT_OPTIMAL_FACE_UNBOUNDED
 		// CPX_STAT_OPTIMAL_INFEAS
 		// CPX_STAT_OPTIMAL_RELAXED
 		// CPX_STAT_UNBOUNDED
 		  LpCplex::SolutionStatus LpCplex::_getDualStatus() const
+		  {
-		    int stat = CPXgetstat(env, lp);
+		  LpCplex::ProblemType LpCplex::_getDualType() const {
 		    int stat = CPXgetstat(cplexEnv(), _prob);
 		#if CPX_VERSION >= 800
 		    switch (stat)
+		    {
 		    switch (stat) {
 		      case CPX_STAT_OPTIMAL:
 		        return OPTIMAL;
 		      case CPX_STAT_UNBOUNDED:
 		        return INFEASIBLE;
 		      default:
 		        return UNDEFINED;
+		    }
 		#else
-		    statusSwitch(env,stat);
+		    statusSwitch(cplexEnv(),stat);
 		    switch (stat) {
 		    case 0:
 		      return UNDEFINED; //Undefined
 		    case CPX_OPTIMAL://Optimal
 		      return OPTIMAL;
 		    case CPX_UNBOUNDED:
 		     return INFEASIBLE;
 		    default:
 		      return UNDEFINED; //Everything else comes here
 		      //FIXME error
+		    }
 		#endif
+		  }
 		  LpCplex::ProblemTypes LpCplex::_getProblemType() const
+		  {
 		    int stat = CPXgetstat(env, lp);
 		#if CPX_VERSION >= 800
 		    switch (stat)
+		    {
 		      case CPX_STAT_OPTIMAL:
 		        return PRIMAL_DUAL_FEASIBLE;
 		      case CPX_STAT_UNBOUNDED:
 		         return PRIMAL_FEASIBLE_DUAL_INFEASIBLE;
 		      default:
 		        return UNKNOWN;
+		    }
+		  // MipCplex members
 		  MipCplex::MipCplex()
 		    : LpBase(), CplexBase(), MipSolver() {
 		#if CPX_VERSION < 800
 		    CPXchgprobtype(cplexEnv(),  _prob, CPXPROB_MIP);
 		#else
 		    switch (stat) {
 		    case CPX_OPTIMAL://Optimal
 		        return PRIMAL_DUAL_FEASIBLE;
 		    case CPX_UNBOUNDED:
 		         return PRIMAL_FEASIBLE_DUAL_INFEASIBLE;
 		//         return PRIMAL_INFEASIBLE_DUAL_FEASIBLE;
 		//         return PRIMAL_DUAL_INFEASIBLE;
 		//Seems to be that this is all we can say for sure
 		    default:
 		        //In all other cases
 		        return UNKNOWN;
 		      //FIXME error
+		    }
 		    CPXchgprobtype(cplexEnv(),  _prob, CPXPROB_MILP);
 		#endif
+		  }
 		  void LpCplex::_setMax()
+		  {
 		    CPXchgobjsen(env, lp, CPX_MAX);
+		   }
 		  void LpCplex::_setMin()
+		  {
-		    CPXchgobjsen(env, lp, CPX_MIN);
+		  MipCplex::MipCplex(const CplexEnv& env)
 		    : LpBase(), CplexBase(env), MipSolver() {
 		#if CPX_VERSION < 800
 		    CPXchgprobtype(cplexEnv(),  _prob, CPXPROB_MIP);
 		#else
 		    CPXchgprobtype(cplexEnv(),  _prob, CPXPROB_MILP);
 		#endif
+		   }
 		  bool LpCplex::_isMax() const
+		  {
 		    if (CPXgetobjsen(env, lp)==CPX_MAX)
 		      return true;
 		  MipCplex::MipCplex(const MipCplex& other)
 		    : LpBase(), CplexBase(other), MipSolver() {}
 		  MipCplex::~MipCplex() {}
 		  MipCplex* MipCplex::_newSolver() const { return new MipCplex; }
 		  MipCplex* MipCplex::_cloneSolver() const {return new MipCplex(*this); }
 		  const char* MipCplex::_solverName() const { return "MipCplex"; }
 		  void MipCplex::_setColType(int i, MipCplex::ColTypes col_type) {
 		    // Note If a variable is to be changed to binary, a call to CPXchgbds
 		    // should also be made to change the bounds to 0 and 1.
 		    switch (col_type){
 		    case INTEGER: {
 		      const char t = 'I';
 		      CPXchgctype (cplexEnv(), _prob, 1, &i, &t);
 		    } break;
 		    case REAL: {
 		      const char t = 'C';
 		      CPXchgctype (cplexEnv(), _prob, 1, &i, &t);
 		    } break;
 		    default:
 		      break;
+		    }
+		  }
 		  MipCplex::ColTypes MipCplex::_getColType(int i) const {
 		    char t;
 		    CPXgetctype (cplexEnv(), _prob, &t, i, i);
 		    switch (t) {
 		    case 'I':
 		      return INTEGER;
 		    case 'C':
 		      return REAL;
 		    default:
 		      LEMON_ASSERT(false, "Invalid column type");
 		      return ColTypes();
+		    }
+		  }
 		  MipCplex::SolveExitStatus MipCplex::_solve() {
 		    int status;
 		    status = CPXmipopt (cplexEnv(), _prob);
 		    if (status==0)
 		      return SOLVED;
 		    else
-		      return false;
+		      return UNSOLVED;
+		  }
 		  MipCplex::ProblemType MipCplex::_getType() const {
 		    int stat = CPXgetstat(cplexEnv(), _prob);
 		    //Fortunately, MIP statuses did not change for cplex 8.0
 		    switch (stat) {
 		    case CPXMIP_OPTIMAL:
 		      // Optimal integer solution has been found.
 		    case CPXMIP_OPTIMAL_TOL:
 		      // Optimal soluton with the tolerance defined by epgap or epagap has
 		      // been found.
 		      return OPTIMAL;
 		      //This also exists in later issues
 		      //    case CPXMIP_UNBOUNDED:
 		      //return UNBOUNDED;
 		      case CPXMIP_INFEASIBLE:
 		        return INFEASIBLE;
 		    default:
 		      return UNDEFINED;
+		    }
 		    //Unboundedness not treated well: the following is from cplex 9.0 doc
 		    // About Unboundedness
 		    // The treatment of models that are unbounded involves a few
 		    // subtleties. Specifically, a declaration of unboundedness means that
 		    // ILOG CPLEX has determined that the model has an unbounded
 		    // ray. Given any feasible solution x with objective z, a multiple of
 		    // the unbounded ray can be added to x to give a feasible solution
 		    // with objective z-1 (or z+1 for maximization models). Thus, if a
 		    // feasible solution exists, then the optimal objective is
 		    // unbounded. Note that ILOG CPLEX has not necessarily concluded that
 		    // a feasible solution exists. Users can call the routine CPXsolninfo
 		    // to determine whether ILOG CPLEX has also concluded that the model
 		    // has a feasible solution.
+		  }
 		  MipCplex::Value MipCplex::_getSol(int i) const {
 		    Value x;
 		    CPXgetmipx(cplexEnv(), _prob, &x, i, i);
 		    return x;
+		  }
 		  MipCplex::Value MipCplex::_getSolValue() const {
 		    Value objval;
 		    CPXgetmipobjval(cplexEnv(), _prob, &objval);
 		    return objval;
+		  }
 		} //namespace lemon

lemon/lp_cplex.h

Show inline comments

@@ -20,94 +20,237 @@
 		#define LEMON_LP_CPLEX_H
 		///\file
 		///\brief Header of the LEMON-CPLEX lp solver interface.
 		#include <lemon/lp_base.h>
 		struct cpxenv;
 		struct cpxlp;
 		namespace lemon {
 		  /// \brief Interface for the CPLEX solver
 		  /// \brief Reference counted wrapper around cpxenv pointer
 		  ///
 		  /// This class implements an interface for the CPLEX LP solver.
 		  class LpCplex :virtual public LpSolverBase {
 		  /// The cplex uses environment object which is responsible for
 		  /// checking the proper license usage. This class provides a simple
 		  /// interface for share the environment object between different
 		  /// problems.
 		  class CplexEnv {
 		    friend class CplexBase;
 		  private:
 		    cpxenv* _env;
 		    mutable int* _cnt;
 		  public:
-		    typedef LpSolverBase Parent;
+		    /// \brief This exception is thrown when the license check is not
 		    /// sufficient
 		    class LicenseError : public Exception {
 		      friend class CplexEnv;
 		    private:
 		    /// \e
 		    int status;
 		    cpxenv* env;
 		    cpxlp* lp;
 		      LicenseError(int status);
 		      char _message[510];
 		    public:
 		    /// \e
 		    LpCplex();
 		    /// \e
 		    LpCplex(const LpCplex&);
 		    /// \e
 		    ~LpCplex();
 		      /// The short error message
 		      virtual const char* what() const throw() {
 		        return _message;
+		      }
 		    };
 		    /// Constructor
 		    CplexEnv();
 		    /// Shallow copy constructor
 		    CplexEnv(const CplexEnv&);
 		    /// Shallow assignement
 		    CplexEnv& operator=(const CplexEnv&);
 		    /// Destructor
 		    virtual ~CplexEnv();
 		  protected:
 		    virtual LpSolverBase* _newLp();
 		    virtual LpSolverBase* _copyLp();
 		    cpxenv* cplexEnv() { return _env; }
 		    const cpxenv* cplexEnv() const { return _env; }
 		  };
 		  /// \brief Base interface for the CPLEX LP and MIP solver
 		  ///
 		  /// This class implements the common interface of the CPLEX LP and
 		  /// MIP solvers.
 		  /// \ingroup lp_group
 		  class CplexBase : virtual public LpBase {
 		  protected:
 		    CplexEnv _env;
 		    cpxlp* _prob;
 		    CplexBase();
 		    CplexBase(const CplexEnv&);
 		    CplexBase(const CplexBase &);
 		    virtual ~CplexBase();
 		    virtual int _addCol();
 		    virtual int _addRow();
 		    virtual void _eraseCol(int i);
 		    virtual void _eraseRow(int i);
 		    virtual void _eraseColId(int i);
 		    virtual void _eraseRowId(int i);
 		    virtual void _getColName(int col, std::string & name) const;
 		    virtual void _setColName(int col, const std::string & name);
 		    virtual int _colByName(const std::string& name) const;
 		    virtual void _setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e);
 		    virtual void _getRowCoeffs(int i, RowIterator b) const;
 		    virtual void _setColCoeffs(int i, ConstColIterator b, ConstColIterator e);
 		    virtual void _getColCoeffs(int i, ColIterator b) const;
 		    virtual void _getRowName(int row, std::string& name) const;
 		    virtual void _setRowName(int row, const std::string& name);
 		    virtual int _rowByName(const std::string& name) const;
 		    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
 		    virtual void _getRowCoeffs(int i, InsertIterator b) const;
 		    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
 		    virtual void _getColCoeffs(int i, InsertIterator b) const;
 		    virtual void _setCoeff(int row, int col, Value value);
 		    virtual Value _getCoeff(int row, int col) const;
 		    virtual void _setColLowerBound(int i, Value value);
 		    virtual Value _getColLowerBound(int i) const;
 		    virtual void _setColUpperBound(int i, Value value);
 		    virtual Value _getColUpperBound(int i) const;
 		//     virtual void _setRowLowerBound(int i, Value value);
 		//     virtual void _setRowUpperBound(int i, Value value);
 		    virtual void _setRowBounds(int i, Value lower, Value upper);
 		    virtual void _getRowBounds(int i, Value &lb, Value &ub) const;
 		  private:
 		    void _set_row_bounds(int i, Value lb, Value ub);
 		  protected:
 		    virtual void _setRowLowerBound(int i, Value value);
 		    virtual Value _getRowLowerBound(int i) const;
 		    virtual void _setRowUpperBound(int i, Value value);
 		    virtual Value _getRowUpperBound(int i) const;
 		    virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);
 		    virtual void _getObjCoeffs(InsertIterator b) const;
 		    virtual void _setObjCoeff(int i, Value obj_coef);
 		    virtual Value _getObjCoeff(int i) const;
 		    virtual void _clearObj();
 		    virtual void _setSense(Sense sense);
 		    virtual Sense _getSense() const;
 		    virtual void _clear();
 		  public:
 		    /// Returns the used \c CplexEnv instance
 		    const CplexEnv& env() const { return _env; }
 		    ///
 		    const cpxenv* cplexEnv() const { return _env.cplexEnv(); }
 		    cpxlp* cplexLp() { return _prob; }
 		    const cpxlp* cplexLp() const { return _prob; }
 		  };
 		  /// \brief Interface for the CPLEX LP solver
 		  ///
 		  /// This class implements an interface for the CPLEX LP solver.
 		  ///\ingroup lp_group
 		  class LpCplex : public CplexBase, public LpSolver {
 		  public:
 		    /// \e
 		    LpCplex();
 		    /// \e
 		    LpCplex(const CplexEnv&);
 		    /// \e
 		    LpCplex(const LpCplex&);
 		    /// \e
 		    virtual ~LpCplex();
 		  private:
 		    // these values cannot retrieved element by element
 		    mutable std::vector<int> _col_status;
 		    mutable std::vector<int> _row_status;
 		    mutable std::vector<Value> _primal_ray;
 		    mutable std::vector<Value> _dual_ray;
 		    void _clear_temporals();
 		    SolveExitStatus convertStatus(int status);
 		  protected:
 		    virtual LpCplex* _cloneSolver() const;
 		    virtual LpCplex* _newSolver() const;
 		    virtual const char* _solverName() const;
 		    virtual SolveExitStatus _solve();
 		    virtual Value _getPrimal(int i) const;
 		    virtual Value _getDual(int i) const;
 		    virtual Value _getPrimalValue() const;
 		    virtual bool _isBasicCol(int i) const;
 		    virtual SolutionStatus _getPrimalStatus() const;
 		    virtual SolutionStatus _getDualStatus() const;
-		    virtual ProblemTypes _getProblemType() const;
+		    virtual VarStatus _getColStatus(int i) const;
 		    virtual VarStatus _getRowStatus(int i) const;
 		    virtual Value _getPrimalRay(int i) const;
 		    virtual Value _getDualRay(int i) const;
 		    virtual void _setMax();
 		    virtual void _setMin();
 		    virtual bool _isMax() const;
 		    virtual ProblemType _getPrimalType() const;
 		    virtual ProblemType _getDualType() const;
 		  public:
 		    cpxenv* cplexEnv() { return env; }
 		    cpxlp* cplexLp() { return lp; }
 		    /// Solve with primal simplex method
 		    SolveExitStatus solvePrimal();
 		    /// Solve with dual simplex method
 		    SolveExitStatus solveDual();
 		    /// Solve with barrier method
 		    SolveExitStatus solveBarrier();
 		  };
 		  /// \brief Interface for the CPLEX MIP solver
 		  ///
 		  /// This class implements an interface for the CPLEX MIP solver.
 		  ///\ingroup lp_group
 		  class MipCplex : public CplexBase, public MipSolver {
 		  public:
 		    /// \e
 		    MipCplex();
 		    /// \e
 		    MipCplex(const CplexEnv&);
 		    /// \e
 		    MipCplex(const MipCplex&);
 		    /// \e
 		    virtual ~MipCplex();
 		  protected:
 		    virtual MipCplex* _cloneSolver() const;
 		    virtual MipCplex* _newSolver() const;
 		    virtual const char* _solverName() const;
 		    virtual ColTypes _getColType(int col) const;
 		    virtual void _setColType(int col, ColTypes col_type);
 		    virtual SolveExitStatus _solve();
 		    virtual ProblemType _getType() const;
 		    virtual Value _getSol(int i) const;
 		    virtual Value _getSolValue() const;
 		  };
 		} //END OF NAMESPACE LEMON
 		#endif //LEMON_LP_CPLEX_H

lemon/lp_glpk.cc

Show inline comments

@@ -8,637 +8,945 @@
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		///\file
-		///\brief Implementation of the LEMON-GLPK lp solver interface.
+		///\brief Implementation of the LEMON GLPK LP and MIP solver interface.
 		#include <lemon/lp_glpk.h>
-		//#include <iostream>
+		#include <glpk.h>
 		extern "C" {
 		#include <glpk.h>
+		}
 		#if GLP_MAJOR_VERSION > 4 || (GLP_MAJOR_VERSION == 4 && GLP_MINOR_VERSION > 15)
 		#define LEMON_glp(func) (glp_##func)
 		#define LEMON_lpx(func) (lpx_##func)
 		#define LEMON_GLP(def) (GLP_##def)
 		#define LEMON_LPX(def) (LPX_##def)
 		#else
 		#define LEMON_glp(func) (lpx_##func)
 		#define LEMON_lpx(func) (lpx_##func)
 		#define LEMON_GLP(def) (LPX_##def)
 		#define LEMON_LPX(def) (LPX_##def)
 		#endif
 		#include <lemon/assert.h>
 		namespace lemon {
 		  LpGlpk::LpGlpk() : Parent() {
 		    solved = false;
 		    rows = _lp_bits::LpId(1);
 		    cols = _lp_bits::LpId(1);
 		    lp = LEMON_glp(create_prob)();
 		    LEMON_glp(create_index)(lp);
-		    messageLevel(0);
+		  // GlpkBase members
 		  GlpkBase::GlpkBase() : LpBase() {
 		    lp = glp_create_prob();
 		    glp_create_index(lp);
+		  }
 		  LpGlpk::LpGlpk(const LpGlpk &glp) : Parent() {
 		    solved = false;
 		    rows = _lp_bits::LpId(1);
 		    cols = _lp_bits::LpId(1);
 		    lp = LEMON_glp(create_prob)();
 		    LEMON_glp(create_index)(lp);
 		    messageLevel(0);
 		    //Coefficient matrix, row bounds
 		    LEMON_glp(add_rows)(lp, LEMON_glp(get_num_rows)(glp.lp));
 		    LEMON_glp(add_cols)(lp, LEMON_glp(get_num_cols)(glp.lp));
 		    int len;
 		    std::vector<int> ind(1+LEMON_glp(get_num_cols)(glp.lp));
 		    std::vector<Value> val(1+LEMON_glp(get_num_cols)(glp.lp));
 		    for (int i=1;i<=LEMON_glp(get_num_rows)(glp.lp);++i)
+		      {
 		        len=LEMON_glp(get_mat_row)(glp.lp,i,&*ind.begin(),&*val.begin());
 		        LEMON_glp(set_mat_row)(lp, i,len,&*ind.begin(),&*val.begin());
 		        LEMON_glp(set_row_bnds)(lp,i,
 		                                LEMON_glp(get_row_type)(glp.lp,i),
 		                                LEMON_glp(get_row_lb)(glp.lp,i),
-		                                LEMON_glp(get_row_ub)(glp.lp,i));
+		  GlpkBase::GlpkBase(const GlpkBase &other) : LpBase() {
 		    lp = glp_create_prob();
 		    glp_copy_prob(lp, other.lp, GLP_ON);
 		    glp_create_index(lp);
 		    rows = other.rows;
 		    cols = other.cols;
+		      }
 		    //Objective function, coloumn bounds
 		    LEMON_glp(set_obj_dir)(lp, LEMON_glp(get_obj_dir)(glp.lp));
 		    //Objectif function's constant term treated separately
 		    LEMON_glp(set_obj_coef)(lp,0,LEMON_glp(get_obj_coef)(glp.lp,0));
 		    for (int i=1;i<=LEMON_glp(get_num_cols)(glp.lp);++i)
+		      {
 		        LEMON_glp(set_obj_coef)(lp,i,
 		                                LEMON_glp(get_obj_coef)(glp.lp,i));
 		        LEMON_glp(set_col_bnds)(lp,i,
 		                                LEMON_glp(get_col_type)(glp.lp,i),
 		                                LEMON_glp(get_col_lb)(glp.lp,i),
 		                                LEMON_glp(get_col_ub)(glp.lp,i));
+		      }
 		    rows = glp.rows;
-		    cols = glp.cols;
+		  GlpkBase::~GlpkBase() {
 		    glp_delete_prob(lp);
+		  }
 		  LpGlpk::~LpGlpk() {
 		    LEMON_glp(delete_prob)(lp);
+		  }
 		  int LpGlpk::_addCol() {
 		    int i=LEMON_glp(add_cols)(lp, 1);
 		    LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FR), 0.0, 0.0);
 		    solved = false;
 		  int GlpkBase::_addCol() {
 		    int i = glp_add_cols(lp, 1);
 		    glp_set_col_bnds(lp, i, GLP_FR, 0.0, 0.0);
 		    return i;
+		  }
 		  ///\e
 		  LpSolverBase* LpGlpk::_newLp()
+		  {
 		    LpGlpk* newlp = new LpGlpk;
 		    return newlp;
+		  }
 		  ///\e
 		  LpSolverBase* LpGlpk::_copyLp()
+		  {
 		    LpGlpk *newlp = new LpGlpk(*this);
 		    return newlp;
+		  }
 		  int LpGlpk::_addRow() {
 		    int i=LEMON_glp(add_rows)(lp, 1);
 		    solved = false;
 		  int GlpkBase::_addRow() {
 		    int i = glp_add_rows(lp, 1);
 		    glp_set_row_bnds(lp, i, GLP_FR, 0.0, 0.0);
 		    return i;
+		  }
 		  void LpGlpk::_eraseCol(int i) {
 		  void GlpkBase::_eraseCol(int i) {
 		    int ca[2];
 		    ca[1]=i;
 		    LEMON_glp(del_cols)(lp, 1, ca);
 		    solved = false;
 		    glp_del_cols(lp, 1, ca);
+		  }
-		  void LpGlpk::_eraseRow(int i) {
+		  void GlpkBase::_eraseRow(int i) {
 		    int ra[2];
 		    ra[1]=i;
 		    LEMON_glp(del_rows)(lp, 1, ra);
 		    solved = false;
 		    glp_del_rows(lp, 1, ra);
+		  }
 		  void LpGlpk::_getColName(int c, std::string & name) const
+		  {
 		    const char *n = LEMON_glp(get_col_name)(lp,c);
-		    name = n?n:"";
+		  void GlpkBase::_eraseColId(int i) {
 		    cols.eraseIndex(i);
 		    cols.shiftIndices(i);
+		  }
 		  void GlpkBase::_eraseRowId(int i) {
 		    rows.eraseIndex(i);
 		    rows.shiftIndices(i);
+		  }
 		  void LpGlpk::_setColName(int c, const std::string & name)
+		  {
-		    LEMON_glp(set_col_name)(lp,c,const_cast<char*>(name.c_str()));
+		  void GlpkBase::_getColName(int c, std::string& name) const {
 		    const char *str = glp_get_col_name(lp, c);
 		    if (str) name = str;
 		    else name.clear();
+		  }
 		  void GlpkBase::_setColName(int c, const std::string & name) {
 		    glp_set_col_name(lp, c, const_cast<char*>(name.c_str()));
+		  }
 		  int LpGlpk::_colByName(const std::string& name) const
+		  {
-		    int k = LEMON_glp(find_col)(lp, const_cast<char*>(name.c_str()));
+		  int GlpkBase::_colByName(const std::string& name) const {
 		    int k = glp_find_col(lp, const_cast<char*>(name.c_str()));
 		    return k > 0 ? k : -1;
+		  }
 		  void GlpkBase::_getRowName(int r, std::string& name) const {
 		    const char *str = glp_get_row_name(lp, r);
 		    if (str) name = str;
 		    else name.clear();
+		  }
 		  void LpGlpk::_setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e)
+		  {
-		    std::vector<int> indices;
+		  void GlpkBase::_setRowName(int r, const std::string & name) {
 		    glp_set_row_name(lp, r, const_cast<char*>(name.c_str()));
+		  }
 		  int GlpkBase::_rowByName(const std::string& name) const {
 		    int k = glp_find_row(lp, const_cast<char*>(name.c_str()));
 		    return k > 0 ? k : -1;
+		  }
 		  void GlpkBase::_setRowCoeffs(int i, ExprIterator b, ExprIterator e) {
 		    std::vector<int> indexes;
 		    std::vector<Value> values;
-		    indices.push_back(0);
+		    indexes.push_back(0);
 		    values.push_back(0);
 		    for(ConstRowIterator it=b; it!=e; ++it) {
 		      indices.push_back(it->first);
 		    for(ExprIterator it = b; it != e; ++it) {
 		      indexes.push_back(it->first);
 		      values.push_back(it->second);
+		    }
 		    LEMON_glp(set_mat_row)(lp, i, values.size() - 1,
 		                                &indices[0], &values[0]);
 		    solved = false;
 		    glp_set_mat_row(lp, i, values.size() - 1,
 		                    &indexes.front(), &values.front());
+		  }
 		  void LpGlpk::_getRowCoeffs(int ix, RowIterator b) const
+		  {
-		    int length = LEMON_glp(get_mat_row)(lp, ix, 0, 0);
+		  void GlpkBase::_getRowCoeffs(int ix, InsertIterator b) const {
 		    int length = glp_get_mat_row(lp, ix, 0, 0);
-		    std::vector<int> indices(length + 1);
+		    std::vector<int> indexes(length + 1);
 		    std::vector<Value> values(length + 1);
-		    LEMON_glp(get_mat_row)(lp, ix, &indices[0], &values[0]);
+		    glp_get_mat_row(lp, ix, &indexes.front(), &values.front());
 		    for (int i = 1; i <= length; ++i) {
-		      *b = std::make_pair(indices[i], values[i]);
+		      *b = std::make_pair(indexes[i], values[i]);
 		      ++b;
+		    }
+		  }
-		  void LpGlpk::_setColCoeffs(int ix, ConstColIterator b, ConstColIterator e) {
+		  void GlpkBase::_setColCoeffs(int ix, ExprIterator b,
 		                                     ExprIterator e) {
-		    std::vector<int> indices;
+		    std::vector<int> indexes;
 		    std::vector<Value> values;
-		    indices.push_back(0);
+		    indexes.push_back(0);
 		    values.push_back(0);
 		    for(ConstColIterator it=b; it!=e; ++it) {
 		      indices.push_back(it->first);
 		    for(ExprIterator it = b; it != e; ++it) {
 		      indexes.push_back(it->first);
 		      values.push_back(it->second);
+		    }
 		    LEMON_glp(set_mat_col)(lp, ix, values.size() - 1,
 		                                &indices[0], &values[0]);
 		    solved = false;
 		    glp_set_mat_col(lp, ix, values.size() - 1,
 		                    &indexes.front(), &values.front());
+		  }
 		  void LpGlpk::_getColCoeffs(int ix, ColIterator b) const
+		  {
-		    int length = LEMON_glp(get_mat_col)(lp, ix, 0, 0);
+		  void GlpkBase::_getColCoeffs(int ix, InsertIterator b) const {
 		    int length = glp_get_mat_col(lp, ix, 0, 0);
-		    std::vector<int> indices(length + 1);
+		    std::vector<int> indexes(length + 1);
 		    std::vector<Value> values(length + 1);
-		    LEMON_glp(get_mat_col)(lp, ix, &indices[0], &values[0]);
+		    glp_get_mat_col(lp, ix, &indexes.front(), &values.front());
 		    for (int i = 1; i <= length; ++i) {
-		      *b = std::make_pair(indices[i], values[i]);
+		      *b = std::make_pair(indexes[i], values[i]);
 		      ++b;
+		    }
+		  }
 		  void LpGlpk::_setCoeff(int ix, int jx, Value value)
+		  {
 		  void GlpkBase::_setCoeff(int ix, int jx, Value value) {
-		    if (LEMON_glp(get_num_cols)(lp) < LEMON_glp(get_num_rows)(lp)) {
+		    if (glp_get_num_cols(lp) < glp_get_num_rows(lp)) {
-		      int length=LEMON_glp(get_mat_row)(lp, ix, 0, 0);
+		      int length = glp_get_mat_row(lp, ix, 0, 0);
-		      std::vector<int> indices(length + 2);
+		      std::vector<int> indexes(length + 2);
 		      std::vector<Value> values(length + 2);
-		      LEMON_glp(get_mat_row)(lp, ix, &indices[0], &values[0]);
+		      glp_get_mat_row(lp, ix, &indexes.front(), &values.front());
 		      //The following code does not suppose that the elements of the
-		      //array indices are sorted
+		      //array indexes are sorted
 		      bool found=false;
 		      for (int i = 1; i <= length; ++i) {
-		        if (indices[i]==jx){
+		        if (indexes[i] == jx) {
 		          found=true;
 		          values[i]=value;
 		          break;
+		        }
+		      }
 		      if (!found){
 		        ++length;
-		        indices[length]=jx;
+		        indexes[length] = jx;
 		        values[length]=value;
+		      }
-		      LEMON_glp(set_mat_row)(lp, ix, length, &indices[0], &values[0]);
+		      glp_set_mat_row(lp, ix, length, &indexes.front(), &values.front());
 		    } else {
-		      int length=LEMON_glp(get_mat_col)(lp, jx, 0, 0);
+		      int length = glp_get_mat_col(lp, jx, 0, 0);
-		      std::vector<int> indices(length + 2);
+		      std::vector<int> indexes(length + 2);
 		      std::vector<Value> values(length + 2);
-		      LEMON_glp(get_mat_col)(lp, jx, &indices[0], &values[0]);
+		      glp_get_mat_col(lp, jx, &indexes.front(), &values.front());
 		      //The following code does not suppose that the elements of the
-		      //array indices are sorted
+		      //array indexes are sorted
 		      bool found=false;
 		      for (int i = 1; i <= length; ++i) {
-		        if (indices[i]==ix){
+		        if (indexes[i] == ix) {
 		          found=true;
 		          values[i]=value;
 		          break;
+		        }
+		      }
 		      if (!found){
 		        ++length;
-		        indices[length]=ix;
+		        indexes[length] = ix;
 		        values[length]=value;
+		      }
 		      LEMON_glp(set_mat_col)(lp, jx, length, &indices[0], &values[0]);
+		    }
 		    solved = false;
+		  }
 		  LpGlpk::Value LpGlpk::_getCoeff(int ix, int jx) const
+		  {
 		    int length=LEMON_glp(get_mat_row)(lp, ix, 0, 0);
 		    std::vector<int> indices(length + 1);
 		    std::vector<Value> values(length + 1);
 		    LEMON_glp(get_mat_row)(lp, ix, &indices[0], &values[0]);
 		    //The following code does not suppose that the elements of the
 		    //array indices are sorted
 		    for (int i = 1; i <= length; ++i) {
 		      if (indices[i]==jx){
 		        return values[i];
+		      }
+		    }
 		    return 0;
+		  }
 		  void LpGlpk::_setColLowerBound(int i, Value lo)
+		  {
 		    if (lo==INF) {
 		      //FIXME error
+		    }
 		    int b=LEMON_glp(get_col_type)(lp, i);
 		    double up=LEMON_glp(get_col_ub)(lp, i);
 		    if (lo==-INF) {
 		      switch (b) {
 		      case LEMON_GLP(FR):
 		      case LEMON_GLP(LO):
 		        LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FR), lo, up);
 		        break;
 		      case LEMON_GLP(UP):
 		        break;
 		      case LEMON_GLP(DB):
 		      case LEMON_GLP(FX):
 		        LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(UP), lo, up);
 		        break;
 		      default: ;
 		        //FIXME error
+		      }
 		    } else {
 		      switch (b) {
 		      case LEMON_GLP(FR):
 		      case LEMON_GLP(LO):
 		        LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(LO), lo, up);
 		        break;
 		      case LEMON_GLP(UP):
 		      case LEMON_GLP(DB):
 		      case LEMON_GLP(FX):
 		        if (lo==up)
 		          LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FX), lo, up);
 		        else
 		          LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(DB), lo, up);
 		        break;
 		      default: ;
 		        //FIXME error
+		      }
+		    }
 		    solved = false;
+		  }
 		  LpGlpk::Value LpGlpk::_getColLowerBound(int i) const
+		  {
 		    int b=LEMON_glp(get_col_type)(lp, i);
 		      switch (b) {
 		      case LEMON_GLP(LO):
 		      case LEMON_GLP(DB):
 		      case LEMON_GLP(FX):
 		        return LEMON_glp(get_col_lb)(lp, i);
 		      default: ;
 		        return -INF;
+		      }
+		  }
 		  void LpGlpk::_setColUpperBound(int i, Value up)
+		  {
 		    if (up==-INF) {
 		      //FIXME error
+		    }
 		    int b=LEMON_glp(get_col_type)(lp, i);
 		    double lo=LEMON_glp(get_col_lb)(lp, i);
 		    if (up==INF) {
 		      switch (b) {
 		      case LEMON_GLP(FR):
 		      case LEMON_GLP(LO):
 		        break;
 		      case LEMON_GLP(UP):
 		        LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FR), lo, up);
 		        break;
 		      case LEMON_GLP(DB):
 		      case LEMON_GLP(FX):
 		        LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(LO), lo, up);
 		        break;
 		      default: ;
 		        //FIXME error
+		      }
 		    } else {
 		      switch (b) {
 		      case LEMON_GLP(FR):
 		        LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(UP), lo, up);
 		        break;
 		      case LEMON_GLP(UP):
 		        LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(UP), lo, up);
 		        break;
 		      case LEMON_GLP(LO):
 		      case LEMON_GLP(DB):
 		      case LEMON_GLP(FX):
 		        if (lo==up)
 		          LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(FX), lo, up);
 		        else
 		          LEMON_glp(set_col_bnds)(lp, i, LEMON_GLP(DB), lo, up);
 		        break;
 		      default: ;
 		        //FIXME error
+		      }
+		    }
 		    solved = false;
+		  }
 		  LpGlpk::Value LpGlpk::_getColUpperBound(int i) const
+		  {
 		    int b=LEMON_glp(get_col_type)(lp, i);
 		      switch (b) {
 		      case LEMON_GLP(UP):
 		      case LEMON_GLP(DB):
 		      case LEMON_GLP(FX):
 		        return LEMON_glp(get_col_ub)(lp, i);
 		      default: ;
 		        return INF;
+		      }
+		  }
 		  void LpGlpk::_setRowBounds(int i, Value lb, Value ub)
+		  {
 		    //Bad parameter
 		    if (lb==INF || ub==-INF) {
 		      //FIXME error
+		    }
 		    if (lb == -INF){
 		      if (ub == INF){
 		        LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(FR), lb, ub);
+		      }
 		      else{
 		        LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(UP), lb, ub);
+		      }
+		    }
 		    else{
 		      if (ub==INF){
 		        LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(LO), lb, ub);
+		      }
 		      else{
 		        if (lb == ub){
 		          LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(FX), lb, ub);
+		        }
 		        else{
 		          LEMON_glp(set_row_bnds)(lp, i, LEMON_GLP(DB), lb, ub);
+		        }
+		      }
+		    }
 		    solved = false;
+		  }
 		  void LpGlpk::_getRowBounds(int i, Value &lb, Value &ub) const
+		  {
 		    int b=LEMON_glp(get_row_type)(lp, i);
 		    switch (b) {
 		    case LEMON_GLP(FR):
 		    case LEMON_GLP(UP):
 		      lb = -INF;
 		        break;
 		    default:
 		      lb=LEMON_glp(get_row_lb)(lp, i);
+		    }
 		    switch (b) {
 		    case LEMON_GLP(FR):
 		    case LEMON_GLP(LO):
 		      ub = INF;
 		        break;
 		    default:
-		      ub=LEMON_glp(get_row_ub)(lp, i);
+		      glp_set_mat_col(lp, jx, length, &indexes.front(), &values.front());
+		    }
+		  }
 		  void LpGlpk::_setObjCoeff(int i, Value obj_coef)
+		  {
 		    //i=0 means the constant term (shift)
 		    LEMON_glp(set_obj_coef)(lp, i, obj_coef);
 		  GlpkBase::Value GlpkBase::_getCoeff(int ix, int jx) const {
-		    solved = false;
+		    int length = glp_get_mat_row(lp, ix, 0, 0);
 		    std::vector<int> indexes(length + 1);
 		    std::vector<Value> values(length + 1);
 		    glp_get_mat_row(lp, ix, &indexes.front(), &values.front());
 		    for (int i = 1; i  <= length; ++i) {
 		      if (indexes[i] == jx) {
 		        return values[i];
+		      }
+		  }
 		  LpGlpk::Value LpGlpk::_getObjCoeff(int i) const {
 		    //i=0 means the constant term (shift)
-		    return LEMON_glp(get_obj_coef)(lp, i);
+		    return 0;
+		  }
 		  void LpGlpk::_clearObj()
+		  {
 		    for (int i=0;i<=LEMON_glp(get_num_cols)(lp);++i){
 		      LEMON_glp(set_obj_coef)(lp, i, 0);
 		  void GlpkBase::_setColLowerBound(int i, Value lo) {
 		    LEMON_ASSERT(lo != INF, "Invalid bound");
 		    int b = glp_get_col_type(lp, i);
 		    double up = glp_get_col_ub(lp, i);
 		    if (lo == -INF) {
 		      switch (b) {
 		      case GLP_FR:
 		      case GLP_LO:
 		        glp_set_col_bnds(lp, i, GLP_FR, lo, up);
 		        break;
 		      case GLP_UP:
 		        break;
 		      case GLP_DB:
 		      case GLP_FX:
 		        glp_set_col_bnds(lp, i, GLP_UP, lo, up);
 		        break;
 		      default:
 		        break;
+		      }
 		    } else {
 		      switch (b) {
 		      case GLP_FR:
 		      case GLP_LO:
 		        glp_set_col_bnds(lp, i, GLP_LO, lo, up);
 		        break;
 		      case GLP_UP:
 		      case GLP_DB:
 		      case GLP_FX:
 		        if (lo == up)
 		          glp_set_col_bnds(lp, i, GLP_FX, lo, up);
 		        else
 		          glp_set_col_bnds(lp, i, GLP_DB, lo, up);
 		        break;
 		      default:
 		        break;
+		      }
+		    }
+		    }
-		    solved = false;
+		  GlpkBase::Value GlpkBase::_getColLowerBound(int i) const {
 		    int b = glp_get_col_type(lp, i);
 		    switch (b) {
 		    case GLP_LO:
 		    case GLP_DB:
 		    case GLP_FX:
 		      return glp_get_col_lb(lp, i);
 		    default:
 		      return -INF;
+		    }
+		  }
 		  LpGlpk::SolveExitStatus LpGlpk::_solve()
+		  {
 		    // A way to check the problem to be solved
 		    //LEMON_glp(write_cpxlp(lp,"naittvan.cpx");
 		  void GlpkBase::_setColUpperBound(int i, Value up) {
 		    LEMON_ASSERT(up != -INF, "Invalid bound");
 		    LEMON_lpx(std_basis)(lp);
 		    int i =  LEMON_lpx(simplex)(lp);
 		    switch (i) {
 		    case LEMON_LPX(E_OK):
 		      solved = true;
-		      return SOLVED;
+		    int b = glp_get_col_type(lp, i);
 		    double lo = glp_get_col_lb(lp, i);
 		    if (up == INF) {
 		      switch (b) {
 		      case GLP_FR:
 		      case GLP_LO:
 		        break;
 		      case GLP_UP:
 		        glp_set_col_bnds(lp, i, GLP_FR, lo, up);
 		        break;
 		      case GLP_DB:
 		      case GLP_FX:
 		        glp_set_col_bnds(lp, i, GLP_LO, lo, up);
 		        break;
 		    default:
-		      return UNSOLVED;
+		        break;
+		      }
 		    } else {
 		      switch (b) {
 		      case GLP_FR:
 		        glp_set_col_bnds(lp, i, GLP_UP, lo, up);
 		        break;
 		      case GLP_UP:
 		        glp_set_col_bnds(lp, i, GLP_UP, lo, up);
 		        break;
 		      case GLP_LO:
 		      case GLP_DB:
 		      case GLP_FX:
 		        if (lo == up)
 		          glp_set_col_bnds(lp, i, GLP_FX, lo, up);
 		        else
 		          glp_set_col_bnds(lp, i, GLP_DB, lo, up);
 		        break;
 		      default:
 		        break;
+		    }
+		  }
 		  LpGlpk::Value LpGlpk::_getPrimal(int i) const
+		  {
 		    return LEMON_glp(get_col_prim)(lp,i);
+		  }
 		  LpGlpk::Value LpGlpk::_getDual(int i) const
+		  {
-		    return LEMON_glp(get_row_dual)(lp,i);
+		  GlpkBase::Value GlpkBase::_getColUpperBound(int i) const {
 		    int b = glp_get_col_type(lp, i);
 		      switch (b) {
 		      case GLP_UP:
 		      case GLP_DB:
 		      case GLP_FX:
 		        return glp_get_col_ub(lp, i);
 		      default:
 		        return INF;
+		      }
+		  }
 		  LpGlpk::Value LpGlpk::_getPrimalValue() const
+		  {
-		    return LEMON_glp(get_obj_val)(lp);
+		  void GlpkBase::_setRowLowerBound(int i, Value lo) {
 		    LEMON_ASSERT(lo != INF, "Invalid bound");
 		    int b = glp_get_row_type(lp, i);
 		    double up = glp_get_row_ub(lp, i);
 		    if (lo == -INF) {
 		      switch (b) {
 		      case GLP_FR:
 		      case GLP_LO:
 		        glp_set_row_bnds(lp, i, GLP_FR, lo, up);
 		        break;
 		      case GLP_UP:
 		        break;
 		      case GLP_DB:
 		      case GLP_FX:
 		        glp_set_row_bnds(lp, i, GLP_UP, lo, up);
 		        break;
 		      default:
 		        break;
+		  }
 		  bool LpGlpk::_isBasicCol(int i) const
+		  {
-		    return (LEMON_glp(get_col_stat)(lp, i)==LEMON_GLP(BS));
+		    } else {
 		      switch (b) {
 		      case GLP_FR:
 		      case GLP_LO:
 		        glp_set_row_bnds(lp, i, GLP_LO, lo, up);
 		        break;
 		      case GLP_UP:
 		      case GLP_DB:
 		      case GLP_FX:
 		        if (lo == up)
 		          glp_set_row_bnds(lp, i, GLP_FX, lo, up);
 		        else
 		          glp_set_row_bnds(lp, i, GLP_DB, lo, up);
 		        break;
 		      default:
 		        break;
+		      }
+		  }
+		  }
 		  LpGlpk::SolutionStatus LpGlpk::_getPrimalStatus() const
+		  {
 		    if (!solved) return UNDEFINED;
 		    int stat=  LEMON_lpx(get_status)(lp);
 		    switch (stat) {
 		    case LEMON_LPX(UNDEF)://Undefined (no solve has been run yet)
 		  GlpkBase::Value GlpkBase::_getRowLowerBound(int i) const {
 		    int b = glp_get_row_type(lp, i);
 		    switch (b) {
 		    case GLP_LO:
 		    case GLP_DB:
 		    case GLP_FX:
 		      return glp_get_row_lb(lp, i);
 		    default:
 		      return -INF;
+		    }
+		  }
 		  void GlpkBase::_setRowUpperBound(int i, Value up) {
 		    LEMON_ASSERT(up != -INF, "Invalid bound");
 		    int b = glp_get_row_type(lp, i);
 		    double lo = glp_get_row_lb(lp, i);
 		    if (up == INF) {
 		      switch (b) {
 		      case GLP_FR:
 		      case GLP_LO:
 		        break;
 		      case GLP_UP:
 		        glp_set_row_bnds(lp, i, GLP_FR, lo, up);
 		        break;
 		      case GLP_DB:
 		      case GLP_FX:
 		        glp_set_row_bnds(lp, i, GLP_LO, lo, up);
 		        break;
 		      default:
 		        break;
+		      }
 		    } else {
 		      switch (b) {
 		      case GLP_FR:
 		        glp_set_row_bnds(lp, i, GLP_UP, lo, up);
 		        break;
 		      case GLP_UP:
 		        glp_set_row_bnds(lp, i, GLP_UP, lo, up);
 		        break;
 		      case GLP_LO:
 		      case GLP_DB:
 		      case GLP_FX:
 		        if (lo == up)
 		          glp_set_row_bnds(lp, i, GLP_FX, lo, up);
 		        else
 		          glp_set_row_bnds(lp, i, GLP_DB, lo, up);
 		        break;
 		      default:
 		        break;
+		      }
+		    }
+		  }
 		  GlpkBase::Value GlpkBase::_getRowUpperBound(int i) const {
 		    int b = glp_get_row_type(lp, i);
 		    switch (b) {
 		    case GLP_UP:
 		    case GLP_DB:
 		    case GLP_FX:
 		      return glp_get_row_ub(lp, i);
 		    default:
 		      return INF;
+		    }
+		  }
 		  void GlpkBase::_setObjCoeffs(ExprIterator b, ExprIterator e) {
 		    for (int i = 1; i <= glp_get_num_cols(lp); ++i) {
 		      glp_set_obj_coef(lp, i, 0.0);
+		    }
 		    for (ExprIterator it = b; it != e; ++it) {
 		      glp_set_obj_coef(lp, it->first, it->second);
+		    }
+		  }
 		  void GlpkBase::_getObjCoeffs(InsertIterator b) const {
 		    for (int i = 1; i <= glp_get_num_cols(lp); ++i) {
 		      Value val = glp_get_obj_coef(lp, i);
 		      if (val != 0.0) {
 		        *b = std::make_pair(i, val);
 		        ++b;
+		      }
+		    }
+		  }
 		  void GlpkBase::_setObjCoeff(int i, Value obj_coef) {
 		    //i = 0 means the constant term (shift)
 		    glp_set_obj_coef(lp, i, obj_coef);
+		  }
 		  GlpkBase::Value GlpkBase::_getObjCoeff(int i) const {
 		    //i = 0 means the constant term (shift)
 		    return glp_get_obj_coef(lp, i);
+		  }
 		  void GlpkBase::_setSense(GlpkBase::Sense sense) {
 		    switch (sense) {
 		    case MIN:
 		      glp_set_obj_dir(lp, GLP_MIN);
 		      break;
 		    case MAX:
 		      glp_set_obj_dir(lp, GLP_MAX);
 		      break;
+		    }
+		  }
 		  GlpkBase::Sense GlpkBase::_getSense() const {
 		    switch(glp_get_obj_dir(lp)) {
 		    case GLP_MIN:
 		      return MIN;
 		    case GLP_MAX:
 		      return MAX;
 		    default:
 		      LEMON_ASSERT(false, "Wrong sense");
 		      return GlpkBase::Sense();
+		    }
+		  }
 		  void GlpkBase::_clear() {
 		    glp_erase_prob(lp);
 		    rows.clear();
 		    cols.clear();
+		  }
 		  // LpGlpk members
 		  LpGlpk::LpGlpk()
 		    : LpBase(), GlpkBase(), LpSolver() {
 		    messageLevel(MESSAGE_NO_OUTPUT);
+		  }
 		  LpGlpk::LpGlpk(const LpGlpk& other)
 		    : LpBase(other), GlpkBase(other), LpSolver(other) {
 		    messageLevel(MESSAGE_NO_OUTPUT);
+		  }
 		  LpGlpk* LpGlpk::_newSolver() const { return new LpGlpk; }
 		  LpGlpk* LpGlpk::_cloneSolver() const { return new LpGlpk(*this); }
 		  const char* LpGlpk::_solverName() const { return "LpGlpk"; }
 		  void LpGlpk::_clear_temporals() {
 		    _primal_ray.clear();
 		    _dual_ray.clear();
+		  }
 		  LpGlpk::SolveExitStatus LpGlpk::_solve() {
 		    return solvePrimal();
+		  }
 		  LpGlpk::SolveExitStatus LpGlpk::solvePrimal() {
 		    _clear_temporals();
 		    glp_smcp smcp;
 		    glp_init_smcp(&smcp);
 		    switch (_message_level) {
 		    case MESSAGE_NO_OUTPUT:
 		      smcp.msg_lev = GLP_MSG_OFF;
 		      break;
 		    case MESSAGE_ERROR_MESSAGE:
 		      smcp.msg_lev = GLP_MSG_ERR;
 		      break;
 		    case MESSAGE_NORMAL_OUTPUT:
 		      smcp.msg_lev = GLP_MSG_ON;
 		      break;
 		    case MESSAGE_FULL_OUTPUT:
 		      smcp.msg_lev = GLP_MSG_ALL;
 		      break;
+		    }
 		    if (glp_simplex(lp, &smcp) != 0) return UNSOLVED;
 		    return SOLVED;
+		  }
 		  LpGlpk::SolveExitStatus LpGlpk::solveDual() {
 		    _clear_temporals();
 		    glp_smcp smcp;
 		    glp_init_smcp(&smcp);
 		    switch (_message_level) {
 		    case MESSAGE_NO_OUTPUT:
 		      smcp.msg_lev = GLP_MSG_OFF;
 		      break;
 		    case MESSAGE_ERROR_MESSAGE:
 		      smcp.msg_lev = GLP_MSG_ERR;
 		      break;
 		    case MESSAGE_NORMAL_OUTPUT:
 		      smcp.msg_lev = GLP_MSG_ON;
 		      break;
 		    case MESSAGE_FULL_OUTPUT:
 		      smcp.msg_lev = GLP_MSG_ALL;
 		      break;
+		    }
 		    smcp.meth = GLP_DUAL;
 		    if (glp_simplex(lp, &smcp) != 0) return UNSOLVED;
 		    return SOLVED;
+		  }
 		  LpGlpk::Value LpGlpk::_getPrimal(int i) const {
 		    return glp_get_col_prim(lp, i);
+		  }
 		  LpGlpk::Value LpGlpk::_getDual(int i) const {
 		    return glp_get_row_dual(lp, i);
+		  }
 		  LpGlpk::Value LpGlpk::_getPrimalValue() const {
 		    return glp_get_obj_val(lp);
+		  }
 		  LpGlpk::VarStatus LpGlpk::_getColStatus(int i) const {
 		    switch (glp_get_col_stat(lp, i)) {
 		    case GLP_BS:
 		      return BASIC;
 		    case GLP_UP:
 		      return UPPER;
 		    case GLP_LO:
 		      return LOWER;
 		    case GLP_NF:
 		      return FREE;
 		    case GLP_NS:
 		      return FIXED;
 		    default:
 		      LEMON_ASSERT(false, "Wrong column status");
 		      return LpGlpk::VarStatus();
+		    }
+		  }
 		  LpGlpk::VarStatus LpGlpk::_getRowStatus(int i) const {
 		    switch (glp_get_row_stat(lp, i)) {
 		    case GLP_BS:
 		      return BASIC;
 		    case GLP_UP:
 		      return UPPER;
 		    case GLP_LO:
 		      return LOWER;
 		    case GLP_NF:
 		      return FREE;
 		    case GLP_NS:
 		      return FIXED;
 		    default:
 		      LEMON_ASSERT(false, "Wrong row status");
 		      return LpGlpk::VarStatus();
+		    }
+		  }
 		  LpGlpk::Value LpGlpk::_getPrimalRay(int i) const {
 		    if (_primal_ray.empty()) {
 		      int row_num = glp_get_num_rows(lp);
 		      int col_num = glp_get_num_cols(lp);
 		      _primal_ray.resize(col_num + 1, 0.0);
 		      int index = glp_get_unbnd_ray(lp);
 		      if (index != 0) {
 		        // The primal ray is found in primal simplex second phase
 		        LEMON_ASSERT((index <= row_num ? glp_get_row_stat(lp, index) :
 		                      glp_get_col_stat(lp, index - row_num)) != GLP_BS,
 		                     "Wrong primal ray");
 		        bool negate = glp_get_obj_dir(lp) == GLP_MAX;
 		        if (index > row_num) {
 		          _primal_ray[index - row_num] = 1.0;
 		          if (glp_get_col_dual(lp, index - row_num) > 0) {
 		            negate = !negate;
+		          }
 		        } else {
 		          if (glp_get_row_dual(lp, index) > 0) {
 		            negate = !negate;
+		          }
+		        }
 		        std::vector<int> ray_indexes(row_num + 1);
 		        std::vector<Value> ray_values(row_num + 1);
 		        int ray_length = glp_eval_tab_col(lp, index, &ray_indexes.front(),
 		                                          &ray_values.front());
 		        for (int i = 1; i <= ray_length; ++i) {
 		          if (ray_indexes[i] > row_num) {
 		            _primal_ray[ray_indexes[i] - row_num] = ray_values[i];
+		          }
+		        }
 		        if (negate) {
 		          for (int i = 1; i <= col_num; ++i) {
 		            _primal_ray[i] = - _primal_ray[i];
+		          }
+		        }
 		      } else {
 		        for (int i = 1; i <= col_num; ++i) {
 		          _primal_ray[i] = glp_get_col_prim(lp, i);
+		        }
+		      }
+		    }
 		    return _primal_ray[i];
+		  }
 		  LpGlpk::Value LpGlpk::_getDualRay(int i) const {
 		    if (_dual_ray.empty()) {
 		      int row_num = glp_get_num_rows(lp);
 		      _dual_ray.resize(row_num + 1, 0.0);
 		      int index = glp_get_unbnd_ray(lp);
 		      if (index != 0) {
 		        // The dual ray is found in dual simplex second phase
 		        LEMON_ASSERT((index <= row_num ? glp_get_row_stat(lp, index) :
 		                      glp_get_col_stat(lp, index - row_num)) == GLP_BS,
 		                     "Wrong dual ray");
 		        int idx;
 		        bool negate = false;
 		        if (index > row_num) {
 		          idx = glp_get_col_bind(lp, index - row_num);
 		          if (glp_get_col_prim(lp, index - row_num) >
 		              glp_get_col_ub(lp, index - row_num)) {
 		            negate = true;
+		          }
 		        } else {
 		          idx = glp_get_row_bind(lp, index);
 		          if (glp_get_row_prim(lp, index) > glp_get_row_ub(lp, index)) {
 		            negate = true;
+		          }
+		        }
 		        _dual_ray[idx] = negate ?  - 1.0 : 1.0;
 		        glp_btran(lp, &_dual_ray.front());
 		      } else {
 		        double eps = 1e-7;
 		        // The dual ray is found in primal simplex first phase
 		        // We assume that the glpk minimizes the slack to get feasible solution
 		        for (int i = 1; i <= row_num; ++i) {
 		          int index = glp_get_bhead(lp, i);
 		          if (index <= row_num) {
 		            double res = glp_get_row_prim(lp, index);
 		            if (res > glp_get_row_ub(lp, index) + eps) {
 		              _dual_ray[i] = -1;
 		            } else if (res < glp_get_row_lb(lp, index) - eps) {
 		              _dual_ray[i] = 1;
 		            } else {
 		              _dual_ray[i] = 0;
+		            }
 		            _dual_ray[i] *= glp_get_rii(lp, index);
 		          } else {
 		            double res = glp_get_col_prim(lp, index - row_num);
 		            if (res > glp_get_col_ub(lp, index - row_num) + eps) {
 		              _dual_ray[i] = -1;
 		            } else if (res < glp_get_col_lb(lp, index - row_num) - eps) {
 		              _dual_ray[i] = 1;
 		            } else {
 		              _dual_ray[i] = 0;
+		            }
 		            _dual_ray[i] /= glp_get_sjj(lp, index - row_num);
+		          }
+		        }
 		        glp_btran(lp, &_dual_ray.front());
 		        for (int i = 1; i <= row_num; ++i) {
 		          _dual_ray[i] /= glp_get_rii(lp, i);
+		        }
+		      }
+		    }
 		    return _dual_ray[i];
+		  }
 		  LpGlpk::ProblemType LpGlpk::_getPrimalType() const {
 		    if (glp_get_status(lp) == GLP_OPT)
 		      return OPTIMAL;
 		    switch (glp_get_prim_stat(lp)) {
 		    case GLP_UNDEF:
 		      return UNDEFINED;
 		    case LEMON_LPX(NOFEAS)://There is no feasible solution (primal, I guess)
 		    case LEMON_LPX(INFEAS)://Infeasible
 		    case GLP_FEAS:
 		    case GLP_INFEAS:
 		      if (glp_get_dual_stat(lp) == GLP_NOFEAS) {
 		        return UNBOUNDED;
 		      } else {
 		        return UNDEFINED;
+		      }
 		    case GLP_NOFEAS:
 		      return INFEASIBLE;
 		    case LEMON_LPX(UNBND)://Unbounded
 		      return INFINITE;
-		    case LEMON_LPX(FEAS)://Feasible
+		    default:
 		      LEMON_ASSERT(false, "Wrong primal type");
 		      return  LpGlpk::ProblemType();
+		    }
+		  }
 		  LpGlpk::ProblemType LpGlpk::_getDualType() const {
 		    if (glp_get_status(lp) == GLP_OPT)
 		      return OPTIMAL;
 		    switch (glp_get_dual_stat(lp)) {
 		    case GLP_UNDEF:
 		      return UNDEFINED;
 		    case GLP_FEAS:
 		    case GLP_INFEAS:
 		      if (glp_get_prim_stat(lp) == GLP_NOFEAS) {
 		        return UNBOUNDED;
 		      } else {
 		        return UNDEFINED;
+		      }
 		    case GLP_NOFEAS:
 		      return INFEASIBLE;
 		    default:
 		      LEMON_ASSERT(false, "Wrong primal type");
 		      return  LpGlpk::ProblemType();
+		    }
+		  }
 		  void LpGlpk::presolver(bool b) {
 		    lpx_set_int_parm(lp, LPX_K_PRESOL, b ? 1 : 0);
+		  }
 		  void LpGlpk::messageLevel(MessageLevel m) {
 		    _message_level = m;
+		  }
 		  // MipGlpk members
 		  MipGlpk::MipGlpk()
 		    : LpBase(), GlpkBase(), MipSolver() {
 		    messageLevel(MESSAGE_NO_OUTPUT);
+		  }
 		  MipGlpk::MipGlpk(const MipGlpk& other)
 		    : LpBase(), GlpkBase(other), MipSolver() {
 		    messageLevel(MESSAGE_NO_OUTPUT);
+		  }
 		  void MipGlpk::_setColType(int i, MipGlpk::ColTypes col_type) {
 		    switch (col_type) {
 		    case INTEGER:
 		      glp_set_col_kind(lp, i, GLP_IV);
 		      break;
 		    case REAL:
 		      glp_set_col_kind(lp, i, GLP_CV);
 		      break;
+		    }
+		  }
 		  MipGlpk::ColTypes MipGlpk::_getColType(int i) const {
 		    switch (glp_get_col_kind(lp, i)) {
 		    case GLP_IV:
 		    case GLP_BV:
 		      return INTEGER;
 		    default:
 		      return REAL;
+		    }
+		  }
 		  MipGlpk::SolveExitStatus MipGlpk::_solve() {
 		    glp_smcp smcp;
 		    glp_init_smcp(&smcp);
 		    switch (_message_level) {
 		    case MESSAGE_NO_OUTPUT:
 		      smcp.msg_lev = GLP_MSG_OFF;
 		      break;
 		    case MESSAGE_ERROR_MESSAGE:
 		      smcp.msg_lev = GLP_MSG_ERR;
 		      break;
 		    case MESSAGE_NORMAL_OUTPUT:
 		      smcp.msg_lev = GLP_MSG_ON;
 		      break;
 		    case MESSAGE_FULL_OUTPUT:
 		      smcp.msg_lev = GLP_MSG_ALL;
 		      break;
+		    }
 		    smcp.meth = GLP_DUAL;
 		    if (glp_simplex(lp, &smcp) != 0) return UNSOLVED;
 		    if (glp_get_status(lp) != GLP_OPT) return SOLVED;
 		    glp_iocp iocp;
 		    glp_init_iocp(&iocp);
 		    switch (_message_level) {
 		    case MESSAGE_NO_OUTPUT:
 		      iocp.msg_lev = GLP_MSG_OFF;
 		      break;
 		    case MESSAGE_ERROR_MESSAGE:
 		      iocp.msg_lev = GLP_MSG_ERR;
 		      break;
 		    case MESSAGE_NORMAL_OUTPUT:
 		      iocp.msg_lev = GLP_MSG_ON;
 		      break;
 		    case MESSAGE_FULL_OUTPUT:
 		      iocp.msg_lev = GLP_MSG_ALL;
 		      break;
+		    }
 		    if (glp_intopt(lp, &iocp) != 0) return UNSOLVED;
 		    return SOLVED;
+		  }
 		  MipGlpk::ProblemType MipGlpk::_getType() const {
 		    switch (glp_get_status(lp)) {
 		    case GLP_OPT:
 		      switch (glp_mip_status(lp)) {
 		      case GLP_UNDEF:
 		        return UNDEFINED;
 		      case GLP_NOFEAS:
 		        return INFEASIBLE;
 		      case GLP_FEAS:
 		      return FEASIBLE;
-		    case LEMON_LPX(OPT)://Feasible
+		      case GLP_OPT:
 		      return OPTIMAL;
 		    default:
 		      return UNDEFINED; //to avoid gcc warning
 		      //FIXME error
 		        LEMON_ASSERT(false, "Wrong problem type.");
 		        return MipGlpk::ProblemType();
+		      }
 		    case GLP_NOFEAS:
 		      return INFEASIBLE;
 		    case GLP_INFEAS:
 		    case GLP_FEAS:
 		      if (glp_get_dual_stat(lp) == GLP_NOFEAS) {
 		        return UNBOUNDED;
 		      } else {
 		        return UNDEFINED;
+		      }
 		    default:
 		      LEMON_ASSERT(false, "Wrong problem type.");
 		      return MipGlpk::ProblemType();
+		    }
+		  }
 		  LpGlpk::SolutionStatus LpGlpk::_getDualStatus() const
+		  {
 		    if (!solved) return UNDEFINED;
 		    switch (LEMON_lpx(get_dual_stat)(lp)) {
 		    case LEMON_LPX(D_UNDEF)://Undefined (no solve has been run yet)
 		      return UNDEFINED;
 		    case LEMON_LPX(D_NOFEAS)://There is no dual feasible solution
 		//    case LEMON_LPX(D_INFEAS://Infeasible
 		      return INFEASIBLE;
 		    case LEMON_LPX(D_FEAS)://Feasible
 		      switch (LEMON_lpx(get_status)(lp)) {
 		      case LEMON_LPX(NOFEAS):
 		        return INFINITE;
 		      case LEMON_LPX(OPT):
 		        return OPTIMAL;
 		      default:
 		        return FEASIBLE;
+		      }
 		    default:
 		      return UNDEFINED; //to avoid gcc warning
 		      //FIXME error
+		    }
 		  MipGlpk::Value MipGlpk::_getSol(int i) const {
 		    return glp_mip_col_val(lp, i);
+		  }
 		  LpGlpk::ProblemTypes LpGlpk::_getProblemType() const
+		  {
 		    if (!solved) return UNKNOWN;
 		      //int stat=  LEMON_glp(get_status(lp);
 		    int statp=  LEMON_lpx(get_prim_stat)(lp);
 		    int statd=  LEMON_lpx(get_dual_stat)(lp);
 		    if (statp==LEMON_LPX(P_FEAS) && statd==LEMON_LPX(D_FEAS))
 		        return PRIMAL_DUAL_FEASIBLE;
 		    if (statp==LEMON_LPX(P_FEAS) && statd==LEMON_LPX(D_NOFEAS))
 		        return PRIMAL_FEASIBLE_DUAL_INFEASIBLE;
 		    if (statp==LEMON_LPX(P_NOFEAS) && statd==LEMON_LPX(D_FEAS))
 		        return PRIMAL_INFEASIBLE_DUAL_FEASIBLE;
 		    if (statp==LEMON_LPX(P_NOFEAS) && statd==LEMON_LPX(D_NOFEAS))
 		        return PRIMAL_DUAL_INFEASIBLE;
 		    //In all other cases
 		    return UNKNOWN;
 		  MipGlpk::Value MipGlpk::_getSolValue() const {
 		    return glp_mip_obj_val(lp);
+		  }
 		  void LpGlpk::_setMax()
+		  {
 		    solved = false;
 		    LEMON_glp(set_obj_dir)(lp, LEMON_GLP(MAX));
 		  MipGlpk* MipGlpk::_newSolver() const { return new MipGlpk; }
 		  MipGlpk* MipGlpk::_cloneSolver() const {return new MipGlpk(*this); }
 		  const char* MipGlpk::_solverName() const { return "MipGlpk"; }
 		  void MipGlpk::messageLevel(MessageLevel m) {
 		    _message_level = m;
+		  }
 		  void LpGlpk::_setMin()
+		  {
 		    solved = false;
 		    LEMON_glp(set_obj_dir)(lp, LEMON_GLP(MIN));
+		  }
 		  bool LpGlpk::_isMax() const
+		  {
 		    return (LEMON_glp(get_obj_dir)(lp)==LEMON_GLP(MAX));
+		  }
 		  void LpGlpk::messageLevel(int m)
+		  {
 		    LEMON_lpx(set_int_parm)(lp, LEMON_LPX(K_MSGLEV), m);
+		  }
 		  void LpGlpk::presolver(bool b)
+		  {
 		    LEMON_lpx(set_int_parm)(lp, LEMON_LPX(K_PRESOL), b);
+		  }
 		} //END OF NAMESPACE LEMON

lemon/lp_glpk.h

Show inline comments

@@ -26,114 +26,234 @@
 		#include <lemon/lp_base.h>
 		// forward declaration
 		#ifndef _GLP_PROB
 		#define _GLP_PROB
 		typedef struct { double _prob; } glp_prob;
 		/* LP/MIP problem object */
 		#endif
 		namespace lemon {
-		  /// \brief Interface for the GLPK LP solver
+		  /// \brief Base interface for the GLPK LP and MIP solver
 		  ///
-		  /// This class implements an interface for the GLPK LP solver.
+		  /// This class implements the common interface of the GLPK LP and MIP solver.
 		  ///\ingroup lp_group
-		  class LpGlpk : virtual public LpSolverBase {
+		  class GlpkBase : virtual public LpBase {
 		  protected:
 		    typedef glp_prob LPX;
 		    glp_prob* lp;
 		    bool solved;
 		  public:
 		    typedef LpSolverBase Parent;
 		    LpGlpk();
 		    LpGlpk(const LpGlpk &);
-		    ~LpGlpk();
+		    GlpkBase();
 		    GlpkBase(const GlpkBase&);
 		    virtual ~GlpkBase();
 		  protected:
 		    virtual LpSolverBase* _newLp();
 		    virtual LpSolverBase* _copyLp();
 		    virtual int _addCol();
 		    virtual int _addRow();
 		    virtual void _eraseCol(int i);
 		    virtual void _eraseRow(int i);
 		    virtual void _eraseColId(int i);
 		    virtual void _eraseRowId(int i);
 		    virtual void _getColName(int col, std::string & name) const;
 		    virtual void _setColName(int col, const std::string & name);
 		    virtual int _colByName(const std::string& name) const;
 		    virtual void _setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e);
 		    virtual void _getRowCoeffs(int i, RowIterator b) const;
 		    virtual void _setColCoeffs(int i, ConstColIterator b, ConstColIterator e);
 		    virtual void _getColCoeffs(int i, ColIterator b) const;
 		    virtual void _getRowName(int row, std::string& name) const;
 		    virtual void _setRowName(int row, const std::string& name);
 		    virtual int _rowByName(const std::string& name) const;
 		    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
 		    virtual void _getRowCoeffs(int i, InsertIterator b) const;
 		    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
 		    virtual void _getColCoeffs(int i, InsertIterator b) const;
 		    virtual void _setCoeff(int row, int col, Value value);
 		    virtual Value _getCoeff(int row, int col) const;
 		    virtual void _setColLowerBound(int i, Value value);
 		    virtual Value _getColLowerBound(int i) const;
 		    virtual void _setColUpperBound(int i, Value value);
 		    virtual Value _getColUpperBound(int i) const;
 		    virtual void _setRowBounds(int i, Value lower, Value upper);
 		    virtual void _getRowBounds(int i, Value &lb, Value &ub) const;
 		    virtual void _setRowLowerBound(int i, Value value);
 		    virtual Value _getRowLowerBound(int i) const;
 		    virtual void _setRowUpperBound(int i, Value value);
 		    virtual Value _getRowUpperBound(int i) const;
 		    virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);
 		    virtual void _getObjCoeffs(InsertIterator b) const;
 		    virtual void _setObjCoeff(int i, Value obj_coef);
 		    virtual Value _getObjCoeff(int i) const;
-		    virtual void _clearObj();
 		    virtual void _setSense(Sense);
 		    virtual Sense _getSense() const;
 		    virtual void _clear();
 		  public:
 		    ///Pointer to the underlying GLPK data structure.
 		    LPX *lpx() {return lp;}
 		    ///Const pointer to the underlying GLPK data structure.
 		    const LPX *lpx() const {return lp;}
 		    ///Returns the constraint identifier understood by GLPK.
 		    int lpxRow(Row r) const { return rows(id(r)); }
 		    ///Returns the variable identifier understood by GLPK.
 		    int lpxCol(Col c) const { return cols(id(c)); }
 		  };
 		  /// \brief Interface for the GLPK LP solver
 		  ///
 		  /// This class implements an interface for the GLPK LP solver.
 		  ///\ingroup lp_group
 		  class LpGlpk : public GlpkBase, public LpSolver {
 		  public:
 		    ///\e
 		    LpGlpk();
 		    ///\e
 		    LpGlpk(const LpGlpk&);
 		  private:
 		    mutable std::vector<double> _primal_ray;
 		    mutable std::vector<double> _dual_ray;
 		    void _clear_temporals();
 		  protected:
 		    virtual LpGlpk* _cloneSolver() const;
 		    virtual LpGlpk* _newSolver() const;
 		    virtual const char* _solverName() const;
 		    virtual SolveExitStatus _solve();
 		    virtual Value _getPrimal(int i) const;
 		    virtual Value _getDual(int i) const;
 		    virtual Value _getPrimalValue() const;
 		    virtual VarStatus _getColStatus(int i) const;
 		    virtual VarStatus _getRowStatus(int i) const;
 		    virtual Value _getPrimalRay(int i) const;
 		    virtual Value _getDualRay(int i) const;
 		    ///\todo It should be clarified
 		    ///
 		    virtual SolveExitStatus _solve();
 		    virtual Value _getPrimal(int i) const;
 		    virtual Value _getDual(int i) const;
 		    virtual Value _getPrimalValue() const;
 		    virtual bool _isBasicCol(int i) const;
 		    ///\e
 		    ///\todo It should be clarified
 		    ///
 		    virtual SolutionStatus _getPrimalStatus() const;
 		    virtual SolutionStatus _getDualStatus() const;
 		    virtual ProblemTypes _getProblemType() const;
 		    virtual void _setMax();
 		    virtual void _setMin();
-		    virtual bool _isMax() const;
+		    virtual ProblemType _getPrimalType() const;
 		    virtual ProblemType _getDualType() const;
 		  public:
 		    ///Set the verbosity of the messages
 		    ///Set the verbosity of the messages
 		    ///
 		    ///\param m is the level of the messages output by the solver routines.
 		    ///The possible values are:
 		    ///- 0 --- no output (default value)
 		    ///- 1 --- error messages only
 		    ///- 2 --- normal output
 		    ///- 3 --- full output (includes informational messages)
-		    void messageLevel(int m);
+		    ///Solve with primal simplex
 		    SolveExitStatus solvePrimal();
 		    ///Solve with dual simplex
 		    SolveExitStatus solveDual();
 		    ///Turns on or off the presolver
 		    ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver
 		    ///
 		    ///The presolver is off by default.
 		    void presolver(bool b);
 		    ///Pointer to the underlying GLPK data structure.
 		    LPX *lpx() {return lp;}
 		    ///Enum for \c messageLevel() parameter
 		    enum MessageLevel {
 		      /// no output (default value)
 		      MESSAGE_NO_OUTPUT = 0,
 		      /// error messages only
 		      MESSAGE_ERROR_MESSAGE = 1,
 		      /// normal output
 		      MESSAGE_NORMAL_OUTPUT = 2,
 		      /// full output (includes informational messages)
 		      MESSAGE_FULL_OUTPUT = 3
 		    };
 		    ///Returns the constraint identifier understood by GLPK.
 		    int lpxRow(Row r) { return _lpId(r); }
 		  private:
 		    ///Returns the variable identifier understood by GLPK.
 		    int lpxCol(Col c) { return _lpId(c); }
 		    MessageLevel _message_level;
 		  public:
 		    ///Set the verbosity of the messages
 		    ///Set the verbosity of the messages
 		    ///
 		    ///\param m is the level of the messages output by the solver routines.
 		    void messageLevel(MessageLevel m);
 		  };
 		  /// \brief Interface for the GLPK MIP solver
 		  ///
 		  /// This class implements an interface for the GLPK MIP solver.
 		  ///\ingroup lp_group
 		  class MipGlpk : public GlpkBase, public MipSolver {
 		  public:
 		    ///\e
 		    MipGlpk();
 		    ///\e
 		    MipGlpk(const MipGlpk&);
 		  protected:
 		    virtual MipGlpk* _cloneSolver() const;
 		    virtual MipGlpk* _newSolver() const;
 		    virtual const char* _solverName() const;
 		    virtual ColTypes _getColType(int col) const;
 		    virtual void _setColType(int col, ColTypes col_type);
 		    virtual SolveExitStatus _solve();
 		    virtual ProblemType _getType() const;
 		    virtual Value _getSol(int i) const;
 		    virtual Value _getSolValue() const;
 		    ///Enum for \c messageLevel() parameter
 		    enum MessageLevel {
 		      /// no output (default value)
 		      MESSAGE_NO_OUTPUT = 0,
 		      /// error messages only
 		      MESSAGE_ERROR_MESSAGE = 1,
 		      /// normal output
 		      MESSAGE_NORMAL_OUTPUT = 2,
 		      /// full output (includes informational messages)
 		      MESSAGE_FULL_OUTPUT = 3
 		    };
 		  private:
 		    MessageLevel _message_level;
 		  public:
 		    ///Set the verbosity of the messages
 		    ///Set the verbosity of the messages
 		    ///
 		    ///\param m is the level of the messages output by the solver routines.
 		    void messageLevel(MessageLevel m);
 		  };
 		} //END OF NAMESPACE LEMON
 		#endif //LEMON_LP_GLPK_H

lemon/lp_skeleton.cc

Show inline comments

@@ -13,175 +13,122 @@
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#include <lemon/lp_skeleton.h>
 		///\file
 		///\brief A skeleton file to implement LP solver interfaces
 		namespace lemon {
 		  LpSolverBase* LpSkeleton::_newLp()
+		  {
 		    LpSolverBase *tmp=0;
 		    return tmp;
+		  }
 		  LpSolverBase* LpSkeleton::_copyLp()
+		  {
 		    LpSolverBase *tmp=0;
 		    return tmp;
+		  }
-		  int LpSkeleton::_addCol()
+		  int SkeletonSolverBase::_addCol()
+		  {
 		    return ++col_num;
+		  }
-		  int LpSkeleton::_addRow()
+		  int SkeletonSolverBase::_addRow()
+		  {
 		    return ++row_num;
+		  }
-		  void LpSkeleton::_eraseCol(int ) {
+		  void SkeletonSolverBase::_eraseCol(int) {}
 		  void SkeletonSolverBase::_eraseRow(int) {}
 		  void SkeletonSolverBase::_getColName(int, std::string &) const {}
 		  void SkeletonSolverBase::_setColName(int, const std::string &) {}
 		  int SkeletonSolverBase::_colByName(const std::string&) const { return -1; }
 		  void SkeletonSolverBase::_getRowName(int, std::string &) const {}
 		  void SkeletonSolverBase::_setRowName(int, const std::string &) {}
 		  int SkeletonSolverBase::_rowByName(const std::string&) const { return -1; }
 		  void SkeletonSolverBase::_setRowCoeffs(int, ExprIterator, ExprIterator) {}
 		  void SkeletonSolverBase::_getRowCoeffs(int, InsertIterator) const {}
 		  void SkeletonSolverBase::_setColCoeffs(int, ExprIterator, ExprIterator) {}
 		  void SkeletonSolverBase::_getColCoeffs(int, InsertIterator) const {}
 		  void SkeletonSolverBase::_setCoeff(int, int, Value) {}
 		  SkeletonSolverBase::Value SkeletonSolverBase::_getCoeff(int, int) const
 		  { return 0; }
 		  void SkeletonSolverBase::_setColLowerBound(int, Value) {}
 		  SkeletonSolverBase::Value SkeletonSolverBase::_getColLowerBound(int) const
 		  {  return 0; }
 		  void SkeletonSolverBase::_setColUpperBound(int, Value) {}
 		  SkeletonSolverBase::Value SkeletonSolverBase::_getColUpperBound(int) const
 		  {  return 0; }
 		  void SkeletonSolverBase::_setRowLowerBound(int, Value) {}
 		  SkeletonSolverBase::Value SkeletonSolverBase::_getRowLowerBound(int) const
 		  {  return 0; }
 		  void SkeletonSolverBase::_setRowUpperBound(int, Value) {}
 		  SkeletonSolverBase::Value SkeletonSolverBase::_getRowUpperBound(int) const
 		  {  return 0; }
 		  void SkeletonSolverBase::_setObjCoeffs(ExprIterator, ExprIterator) {}
 		  void SkeletonSolverBase::_getObjCoeffs(InsertIterator) const {};
 		  void SkeletonSolverBase::_setObjCoeff(int, Value) {}
 		  SkeletonSolverBase::Value SkeletonSolverBase::_getObjCoeff(int) const
 		  {  return 0; }
 		  void SkeletonSolverBase::_setSense(Sense) {}
 		  SkeletonSolverBase::Sense SkeletonSolverBase::_getSense() const
 		  { return MIN; }
 		  void SkeletonSolverBase::_clear() {
 		    row_num = col_num = 0;
+		  }
 		  void LpSkeleton::_eraseRow(int) {
+		  }
 		  LpSkeleton::SolveExitStatus LpSkeleton::_solve() { return SOLVED; }
 		  void LpSkeleton::_getColName(int, std::string &) const {
+		  }
 		  LpSkeleton::Value LpSkeleton::_getPrimal(int) const { return 0; }
 		  LpSkeleton::Value LpSkeleton::_getDual(int) const { return 0; }
 		  LpSkeleton::Value LpSkeleton::_getPrimalValue() const { return 0; }
 		  LpSkeleton::Value LpSkeleton::_getPrimalRay(int) const { return 0; }
 		  LpSkeleton::Value LpSkeleton::_getDualRay(int) const { return 0; }
 		  void LpSkeleton::_setColName(int, const std::string &) {
+		  }
 		  LpSkeleton::ProblemType LpSkeleton::_getPrimalType() const
 		  { return UNDEFINED; }
-		  int LpSkeleton::_colByName(const std::string&) const { return -1; }
+		  LpSkeleton::ProblemType LpSkeleton::_getDualType() const
 		  { return UNDEFINED; }
 		  LpSkeleton::VarStatus LpSkeleton::_getColStatus(int) const
 		  { return BASIC; }
 		  void LpSkeleton::_setRowCoeffs(int, ConstRowIterator, ConstRowIterator) {
+		  }
 		  LpSkeleton::VarStatus LpSkeleton::_getRowStatus(int) const
 		  { return BASIC; }
 		  void LpSkeleton::_getRowCoeffs(int, RowIterator) const {
+		  }
 		  LpSkeleton* LpSkeleton::_newSolver() const
 		  { return static_cast<LpSkeleton*>(0); }
 		  void LpSkeleton::_setColCoeffs(int, ConstColIterator, ConstColIterator) {
+		  }
 		  LpSkeleton* LpSkeleton::_cloneSolver() const
 		  { return static_cast<LpSkeleton*>(0); }
 		  void LpSkeleton::_getColCoeffs(int, ColIterator) const {
+		  }
 		  const char* LpSkeleton::_solverName() const { return "LpSkeleton"; }
 		  void LpSkeleton::_setCoeff(int, int, Value )
+		  {
+		  }
+		  MipSkeleton::SolveExitStatus MipSkeleton::_solve()
 		  { return SOLVED; }
 		  LpSkeleton::Value LpSkeleton::_getCoeff(int, int) const
+		  {
 		    return 0;
+		  }
 		  MipSkeleton::Value MipSkeleton::_getSol(int) const { return 0; }
 		  MipSkeleton::Value MipSkeleton::_getSolValue() const { return 0; }
 		  MipSkeleton::ProblemType MipSkeleton::_getType() const
 		  { return UNDEFINED; }
 		  void LpSkeleton::_setColLowerBound(int, Value)
+		  {
+		  }
+		  MipSkeleton* MipSkeleton::_newSolver() const
 		  { return static_cast<MipSkeleton*>(0); }
 		  LpSkeleton::Value LpSkeleton::_getColLowerBound(int) const
+		  {
 		    return 0;
+		  }
 		  MipSkeleton* MipSkeleton::_cloneSolver() const
 		  { return static_cast<MipSkeleton*>(0); }
 		  void LpSkeleton::_setColUpperBound(int, Value)
+		  {
+		  }
 		  LpSkeleton::Value LpSkeleton::_getColUpperBound(int) const
+		  {
 		    return 0;
+		  }
 		//   void LpSkeleton::_setRowLowerBound(int, Value)
 		//   {
 		//   }
 		//   void LpSkeleton::_setRowUpperBound(int, Value)
 		//   {
 		//   }
 		  void LpSkeleton::_setRowBounds(int, Value, Value)
+		  {
+		  }
 		  void LpSkeleton::_getRowBounds(int, Value&, Value&) const
+		  {
+		  }
 		  void LpSkeleton::_setObjCoeff(int, Value)
+		  {
+		  }
 		  LpSkeleton::Value LpSkeleton::_getObjCoeff(int) const
+		  {
 		    return 0;
+		  }
 		  void LpSkeleton::_setMax()
+		  {
+		  }
 		  void LpSkeleton::_setMin()
+		  {
+		  }
 		  bool LpSkeleton::_isMax() const
+		  {
 		    return true;
+		  }
 		  void LpSkeleton::_clearObj()
+		  {
+		  }
 		  LpSkeleton::SolveExitStatus LpSkeleton::_solve()
+		  {
 		    return SOLVED;
+		  }
 		  LpSkeleton::Value LpSkeleton::_getPrimal(int) const
+		  {
 		    return 0;
+		  }
 		  LpSkeleton::Value LpSkeleton::_getDual(int) const
+		  {
 		    return 0;
+		  }
 		  LpSkeleton::Value LpSkeleton::_getPrimalValue() const
+		  {
 		    return 0;
+		  }
 		  LpSkeleton::SolutionStatus LpSkeleton::_getPrimalStatus() const
+		  {
 		    return UNDEFINED;
+		  }
 		  LpSkeleton::SolutionStatus LpSkeleton::_getDualStatus() const
+		  {
 		    return UNDEFINED;
+		  }
 		  LpSkeleton::ProblemTypes LpSkeleton::_getProblemType() const
+		  {
 		    return UNKNOWN;
+		  }
 		  bool LpSkeleton::_isBasicCol(int) const
+		  {
 		    return true;
+		  }
+		  const char* MipSkeleton::_solverName() const { return "MipSkeleton"; }
 		} //namespace lemon

lemon/lp_skeleton.h

Show inline comments

@@ -17,56 +17,63 @@
 		 */
 		#ifndef LEMON_LP_SKELETON
 		#define LEMON_LP_SKELETON
 		#include <lemon/lp_base.h>
 		///\file
 		///\brief A skeleton file to implement LP solver interfaces
 		namespace lemon {
 		  ///A skeleton class to implement LP solver interfaces
-		  class LpSkeleton :public LpSolverBase {
+		  class SkeletonSolverBase : public virtual LpBase {
 		    int col_num,row_num;
 		  protected:
 		    ///\e
 		    virtual LpSolverBase* _newLp();
 		    ///\e
 		    virtual LpSolverBase* _copyLp();
 		    SkeletonSolverBase()
 		      : col_num(-1), row_num(-1) {}
 		    /// \e
 		    virtual int _addCol();
 		    /// \e
 		    virtual int _addRow();
 		    /// \e
 		    virtual void _eraseCol(int i);
 		    /// \e
 		    virtual void _eraseRow(int i);
 		    /// \e
 		    virtual void _getColName(int col, std::string & name) const;
 		    /// \e
 		    virtual void _setColName(int col, const std::string & name);
 		    /// \e
 		    virtual int _colByName(const std::string& name) const;
 		    /// \e
-		    virtual void _setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e);
+		    virtual void _getRowName(int row, std::string& name) const;
 		    /// \e
-		    virtual void _getRowCoeffs(int i, RowIterator b) const;
+		    virtual void _setRowName(int row, const std::string& name);
 		    /// \e
-		    virtual void _setColCoeffs(int i, ConstColIterator b, ConstColIterator e);
+		    virtual int _rowByName(const std::string& name) const;
 		    /// \e
-		    virtual void _getColCoeffs(int i, ColIterator b) const;
+		    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
 		    /// \e
 		    virtual void _getRowCoeffs(int i, InsertIterator b) const;
 		    /// \e
 		    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
 		    /// \e
 		    virtual void _getColCoeffs(int i, InsertIterator b) const;
 		    /// Set one element of the coefficient matrix
 		    virtual void _setCoeff(int row, int col, Value value);
 		    /// Get one element of the coefficient matrix
 		    virtual Value _getCoeff(int row, int col) const;
 		    /// The lower bound of a variable (column) have to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or -\ref INF.
 		    virtual void _setColLowerBound(int i, Value value);
 		    /// \e
@@ -78,106 +85,145 @@
 		    /// The upper bound of a variable (column) have to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or \ref INF.
 		    virtual void _setColUpperBound(int i, Value value);
 		    /// \e
 		    /// The upper bound of a variable (column) is an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or \ref INF.
 		    virtual Value _getColUpperBound(int i) const;
 		//     /// The lower bound of a linear expression (row) have to be given by an
 		//     /// extended number of type Value, i.e. a finite number of type
 		//     /// Value or -\ref INF.
 		//     virtual void _setRowLowerBound(int i, Value value);
 		//     /// \e
 		//     /// The upper bound of a linear expression (row) have to be given by an
 		//     /// extended number of type Value, i.e. a finite number of type
 		//     /// Value or \ref INF.
 		//     virtual void _setRowUpperBound(int i, Value value);
 		    /// The lower and upper bound of a linear expression (row) have to be
 		    /// given by an
+		    /// The lower bound of a constraint (row) have to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or +/-\ref INF.
 		    virtual void _setRowBounds(int i, Value lb, Value ub);
 		    /// Value or -\ref INF.
 		    virtual void _setRowLowerBound(int i, Value value);
 		    /// \e
 		    /// The lower bound of a constraint (row) is an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or -\ref INF.
 		    virtual Value _getRowLowerBound(int i) const;
 		    /// The lower and the upper bound of
 		    /// a constraint (row) are
 		    /// extended numbers of type Value, i.e.  finite numbers of type
 		    /// Value, -\ref INF or \ref INF.
-		    virtual void _getRowBounds(int i, Value &lb, Value &ub) const;
+		    /// The upper bound of a constraint (row) have to be given by an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or \ref INF.
 		    virtual void _setRowUpperBound(int i, Value value);
 		    /// \e
 		    /// The upper bound of a constraint (row) is an
 		    /// extended number of type Value, i.e. a finite number of type
 		    /// Value or \ref INF.
 		    virtual Value _getRowUpperBound(int i) const;
 		    /// \e
-		    virtual void _clearObj();
+		    virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);
 		    /// \e
 		    virtual void _getObjCoeffs(InsertIterator b) const;
 		    /// \e
 		    virtual void _setObjCoeff(int i, Value obj_coef);
 		    /// \e
 		    virtual Value _getObjCoeff(int i) const;
 		    ///\e
 		    virtual void _setSense(Sense);
 		    ///\e
 		    virtual Sense _getSense() const;
 		    ///\e
 		    virtual void _clear();
 		  };
 		  /// \brief Interface for a skeleton LP solver
 		  ///
 		  /// This class implements an interface for a skeleton LP solver.
 		  ///\ingroup lp_group
 		  class LpSkeleton : public SkeletonSolverBase, public LpSolver {
 		  public:
 		    LpSkeleton() : SkeletonSolverBase(), LpSolver() {}
 		  protected:
 		    ///\e
 		    virtual SolveExitStatus _solve();
 		    ///\e
 		    virtual Value _getPrimal(int i) const;
 		    ///\e
 		    virtual Value _getDual(int i) const;
 		    ///\e
 		    virtual Value _getPrimalValue() const;
 		    ///\e
 		    virtual Value _getPrimalRay(int i) const;
 		    ///\e
 		    virtual Value _getDualRay(int i) const;
 		    ///\e
 		    virtual ProblemType _getPrimalType() const;
 		    ///\e
 		    virtual ProblemType _getDualType() const;
 		    ///\e
 		    virtual VarStatus _getColStatus(int i) const;
 		    ///\e
 		    virtual VarStatus _getRowStatus(int i) const;
 		    ///\e
 		    virtual LpSkeleton* _newSolver() const;
 		    ///\e
 		    virtual LpSkeleton* _cloneSolver() const;
 		    ///\e
 		    virtual const char* _solverName() const;
 		  };
 		  /// \brief Interface for a skeleton MIP solver
 		  ///
 		  /// This class implements an interface for a skeleton MIP solver.
 		  ///\ingroup lp_group
 		  class MipSkeleton : public SkeletonSolverBase, public MipSolver {
 		  public:
 		    MipSkeleton() : SkeletonSolverBase(), MipSolver() {}
 		  protected:
 		    ///\e
 		    ///\bug Wrong interface
 		    ///
 		    virtual SolveExitStatus _solve();
 		    ///\e
 		    ///\bug Wrong interface
 		    ///
-		    virtual Value _getPrimal(int i) const;
+		    virtual Value _getSol(int i) const;
 		    ///\e
 		    ///\bug Wrong interface
 		    ///
-		    virtual Value _getDual(int i) const;
+		    virtual Value _getSolValue() const;
 		    ///\e
 		    ///\bug Wrong interface
 		    ///
-		    virtual Value _getPrimalValue() const;
+		    virtual ProblemType _getType() const;
 		    ///\e
 		    ///\bug Wrong interface
 		    ///
 		    virtual SolutionStatus _getPrimalStatus() const;
 		    ////e
 		    virtual SolutionStatus _getDualStatus() const;
 		    virtual MipSkeleton* _newSolver() const;
 		    ///\e
-		    virtual ProblemTypes _getProblemType() const;
+		    virtual MipSkeleton* _cloneSolver() const;
 		    ///\e
 		    virtual const char* _solverName() const;
 		    ///\e
 		    virtual void _setMax();
 		    ///\e
 		    virtual void _setMin();
 		    ///\e
 		    virtual bool _isMax() const;
 		    ///\e
 		    virtual bool _isBasicCol(int i) const;
 		  public:
 		    LpSkeleton() : LpSolverBase(), col_num(0), row_num(0) {}
 		  };
 		} //namespace lemon
 		#endif // LEMON_LP_SKELETON

lemon/lp_soplex.cc

Show inline comments

@@ -17,300 +17,407 @@
 		 */
 		#include<iostream>
 		#include<lemon/lp_soplex.h>
 		#include <soplex/soplex.h>
 		///\file
 		///\brief Implementation of the LEMON-SOPLEX lp solver interface.
 		namespace lemon {
 		  LpSoplex::LpSoplex() : LpSolverBase() {
 		    rows.setIdHandler(relocateIdHandler);
-		    cols.setIdHandler(relocateIdHandler);
+		  LpSoplex::LpSoplex() {
 		    soplex = new soplex::SoPlex;
 		    solved = false;
+		  }
 		  LpSoplex::~LpSoplex() {
 		    delete soplex;
+		  }
-		  LpSoplex::LpSoplex(const LpSoplex& lp) : LpSolverBase() {
 		  LpSoplex::LpSoplex(const LpSoplex& lp) {
 		    rows = lp.rows;
 		    rows.setIdHandler(relocateIdHandler);
 		    cols = lp.cols;
 		    cols.setIdHandler(relocateIdHandler);
 		    soplex = new soplex::SoPlex;
 		    (*static_cast<soplex::SPxLP*>(soplex)) = *(lp.soplex);
 		    colNames = lp.colNames;
 		    invColNames = lp.invColNames;
 		    _col_names = lp._col_names;
 		    _col_names_ref = lp._col_names_ref;
 		    primal_value = lp.primal_value;
 		    dual_value = lp.dual_value;
 		    _row_names = lp._row_names;
 		    _row_names_ref = lp._row_names_ref;
+		  }
-		  LpSolverBase* LpSoplex::_newLp() {
+		  void LpSoplex::_clear_temporals() {
 		    _primal_values.clear();
 		    _dual_values.clear();
+		  }
 		  LpSoplex* LpSoplex::_newSolver() const {
 		    LpSoplex* newlp = new LpSoplex();
 		    return newlp;
+		  }
-		  LpSolverBase* LpSoplex::_copyLp() {
+		  LpSoplex* LpSoplex::_cloneSolver() const {
 		    LpSoplex* newlp = new LpSoplex(*this);
 		    return newlp;
+		  }
 		  const char* LpSoplex::_solverName() const { return "LpSoplex"; }
 		  int LpSoplex::_addCol() {
 		    soplex::LPCol c;
 		    c.setLower(-soplex::infinity);
 		    c.setUpper(soplex::infinity);
 		    soplex->addCol(c);
 		    colNames.push_back(std::string());
 		    primal_value.push_back(0.0);
-		    solved = false;
+		    _col_names.push_back(std::string());
 		    return soplex->nCols() - 1;
+		  }
 		  int LpSoplex::_addRow() {
 		    soplex::LPRow r;
 		    r.setLhs(-soplex::infinity);
 		    r.setRhs(soplex::infinity);
 		    soplex->addRow(r);
 		    dual_value.push_back(0.0);
 		    solved = false;
 		    _row_names.push_back(std::string());
 		    return soplex->nRows() - 1;
+		  }
 		  void LpSoplex::_eraseCol(int i) {
 		    soplex->removeCol(i);
 		    invColNames.erase(colNames[i]);
 		    colNames[i] = colNames.back();
 		    invColNames[colNames.back()] = i;
 		    colNames.pop_back();
 		    primal_value[i] = primal_value.back();
 		    primal_value.pop_back();
-		    solved = false;
+		    _col_names_ref.erase(_col_names[i]);
 		    _col_names[i] = _col_names.back();
 		    _col_names_ref[_col_names.back()] = i;
 		    _col_names.pop_back();
+		  }
 		  void LpSoplex::_eraseRow(int i) {
 		    soplex->removeRow(i);
 		    dual_value[i] = dual_value.back();
 		    dual_value.pop_back();
-		    solved = false;
+		    _row_names_ref.erase(_row_names[i]);
 		    _row_names[i] = _row_names.back();
 		    _row_names_ref[_row_names.back()] = i;
 		    _row_names.pop_back();
+		  }
 		  void LpSoplex::_eraseColId(int i) {
 		    cols.eraseIndex(i);
 		    cols.relocateIndex(i, cols.maxIndex());
+		  }
 		  void LpSoplex::_eraseRowId(int i) {
 		    rows.eraseIndex(i);
 		    rows.relocateIndex(i, rows.maxIndex());
+		  }
 		  void LpSoplex::_getColName(int c, std::string &name) const {
-		    name = colNames[c];
+		    name = _col_names[c];
+		  }
 		  void LpSoplex::_setColName(int c, const std::string &name) {
 		    invColNames.erase(colNames[c]);
 		    colNames[c] = name;
 		    _col_names_ref.erase(_col_names[c]);
 		    _col_names[c] = name;
 		    if (!name.empty()) {
-		      invColNames.insert(std::make_pair(name, c));
+		      _col_names_ref.insert(std::make_pair(name, c));
+		    }
+		  }
 		  int LpSoplex::_colByName(const std::string& name) const {
 		    std::map<std::string, int>::const_iterator it =
 		      invColNames.find(name);
 		    if (it != invColNames.end()) {
 		      _col_names_ref.find(name);
 		    if (it != _col_names_ref.end()) {
 		      return it->second;
 		    } else {
 		      return -1;
+		    }
+		  }
 		  void LpSoplex::_getRowName(int r, std::string &name) const {
 		    name = _row_names[r];
+		  }
-		  void LpSoplex::_setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e) {
+		  void LpSoplex::_setRowName(int r, const std::string &name) {
 		    _row_names_ref.erase(_row_names[r]);
 		    _row_names[r] = name;
 		    if (!name.empty()) {
 		      _row_names_ref.insert(std::make_pair(name, r));
+		    }
+		  }
 		  int LpSoplex::_rowByName(const std::string& name) const {
 		    std::map<std::string, int>::const_iterator it =
 		      _row_names_ref.find(name);
 		    if (it != _row_names_ref.end()) {
 		      return it->second;
 		    } else {
 		      return -1;
+		    }
+		  }
 		  void LpSoplex::_setRowCoeffs(int i, ExprIterator b, ExprIterator e) {
 		    for (int j = 0; j < soplex->nCols(); ++j) {
 		      soplex->changeElement(i, j, 0.0);
+		    }
-		    for(ConstRowIterator it = b; it != e; ++it) {
+		    for(ExprIterator it = b; it != e; ++it) {
 		      soplex->changeElement(i, it->first, it->second);
+		    }
 		    solved = false;
+		  }
-		  void LpSoplex::_getRowCoeffs(int i, RowIterator b) const {
+		  void LpSoplex::_getRowCoeffs(int i, InsertIterator b) const {
 		    const soplex::SVector& vec = soplex->rowVector(i);
 		    for (int k = 0; k < vec.size(); ++k) {
 		      *b = std::make_pair(vec.index(k), vec.value(k));
 		      ++b;
+		    }
+		  }
-		  void LpSoplex::_setColCoeffs(int j, ConstColIterator b, ConstColIterator e) {
+		  void LpSoplex::_setColCoeffs(int j, ExprIterator b, ExprIterator e) {
 		    for (int i = 0; i < soplex->nRows(); ++i) {
 		      soplex->changeElement(i, j, 0.0);
+		    }
-		    for(ConstColIterator it = b; it != e; ++it) {
+		    for(ExprIterator it = b; it != e; ++it) {
 		      soplex->changeElement(it->first, j, it->second);
+		    }
 		    solved = false;
+		  }
-		  void LpSoplex::_getColCoeffs(int i, ColIterator b) const {
+		  void LpSoplex::_getColCoeffs(int i, InsertIterator b) const {
 		    const soplex::SVector& vec = soplex->colVector(i);
 		    for (int k = 0; k < vec.size(); ++k) {
 		      *b = std::make_pair(vec.index(k), vec.value(k));
 		      ++b;
+		    }
+		  }
 		  void LpSoplex::_setCoeff(int i, int j, Value value) {
 		    soplex->changeElement(i, j, value);
 		    solved = false;
+		  }
 		  LpSoplex::Value LpSoplex::_getCoeff(int i, int j) const {
 		    return soplex->rowVector(i)[j];
+		  }
 		  void LpSoplex::_setColLowerBound(int i, Value value) {
 		    LEMON_ASSERT(value != INF, "Invalid bound");
 		    soplex->changeLower(i, value != -INF ? value : -soplex::infinity);
 		    solved = false;
+		  }
 		  LpSoplex::Value LpSoplex::_getColLowerBound(int i) const {
 		    double value = soplex->lower(i);
 		    return value != -soplex::infinity ? value : -INF;
+		  }
 		  void LpSoplex::_setColUpperBound(int i, Value value) {
 		    LEMON_ASSERT(value != -INF, "Invalid bound");
 		    soplex->changeUpper(i, value != INF ? value : soplex::infinity);
 		    solved = false;
+		  }
 		  LpSoplex::Value LpSoplex::_getColUpperBound(int i) const {
 		    double value = soplex->upper(i);
 		    return value != soplex::infinity ? value : INF;
+		  }
 		  void LpSoplex::_setRowBounds(int i, Value lb, Value ub) {
 		    soplex->changeRange(i, lb != -INF ? lb : -soplex::infinity,
 		                        ub != INF ? ub : soplex::infinity);
 		    solved = false;
 		  void LpSoplex::_setRowLowerBound(int i, Value lb) {
 		    LEMON_ASSERT(lb != INF, "Invalid bound");
 		    soplex->changeRange(i, lb != -INF ? lb : -soplex::infinity, soplex->rhs(i));
+		  }
 		  void LpSoplex::_getRowBounds(int i, Value &lower, Value &upper) const {
 		    lower = soplex->lhs(i);
 		    if (lower == -soplex::infinity) lower = -INF;
 		    upper = soplex->rhs(i);
-		    if (upper == -soplex::infinity) upper = INF;
 		  LpSoplex::Value LpSoplex::_getRowLowerBound(int i) const {
 		    double res = soplex->lhs(i);
 		    return res == -soplex::infinity ? -INF : res;
+		  }
 		  void LpSoplex::_setRowUpperBound(int i, Value ub) {
 		    LEMON_ASSERT(ub != -INF, "Invalid bound");
 		    soplex->changeRange(i, soplex->lhs(i), ub != INF ? ub : soplex::infinity);
+		  }
 		  LpSoplex::Value LpSoplex::_getRowUpperBound(int i) const {
 		    double res = soplex->rhs(i);
 		    return res == soplex::infinity ? INF : res;
+		  }
 		  void LpSoplex::_setObjCoeffs(ExprIterator b, ExprIterator e) {
 		    for (int j = 0; j < soplex->nCols(); ++j) {
 		      soplex->changeObj(j, 0.0);
+		    }
 		    for (ExprIterator it = b; it != e; ++it) {
 		      soplex->changeObj(it->first, it->second);
+		    }
+		  }
 		  void LpSoplex::_getObjCoeffs(InsertIterator b) const {
 		    for (int j = 0; j < soplex->nCols(); ++j) {
 		      Value coef = soplex->obj(j);
 		      if (coef != 0.0) {
 		        *b = std::make_pair(j, coef);
 		        ++b;
+		      }
+		    }
+		  }
 		  void LpSoplex::_setObjCoeff(int i, Value obj_coef) {
 		    soplex->changeObj(i, obj_coef);
 		    solved = false;
+		  }
 		  LpSoplex::Value LpSoplex::_getObjCoeff(int i) const {
 		    return soplex->obj(i);
+		  }
 		  void LpSoplex::_clearObj() {
 		    for (int i = 0; i < soplex->nCols(); ++i) {
 		      soplex->changeObj(i, 0.0);
+		    }
 		    solved = false;
+		  }
 		  LpSoplex::SolveExitStatus LpSoplex::_solve() {
-		  LpSoplex::SolveExitStatus LpSoplex::_solve() {
+		    _clear_temporals();
 		    soplex::SPxSolver::Status status = soplex->solve();
 		    soplex::Vector pv(primal_value.size(), &primal_value[0]);
 		    soplex->getPrimal(pv);
 		    soplex::Vector dv(dual_value.size(), &dual_value[0]);
 		    soplex->getDual(dv);
 		    switch (status) {
 		    case soplex::SPxSolver::OPTIMAL:
 		    case soplex::SPxSolver::INFEASIBLE:
 		    case soplex::SPxSolver::UNBOUNDED:
 		      solved = true;
 		      return SOLVED;
 		    default:
 		      return UNSOLVED;
+		    }
+		  }
 		  LpSoplex::Value LpSoplex::_getPrimal(int i) const {
-		    return primal_value[i];
+		    if (_primal_values.empty()) {
 		      _primal_values.resize(soplex->nCols());
 		      soplex::Vector pv(_primal_values.size(), &_primal_values.front());
 		      soplex->getPrimal(pv);
+		    }
 		    return _primal_values[i];
+		  }
 		  LpSoplex::Value LpSoplex::_getDual(int i) const {
-		    return dual_value[i];
+		    if (_dual_values.empty()) {
 		      _dual_values.resize(soplex->nRows());
 		      soplex::Vector dv(_dual_values.size(), &_dual_values.front());
 		      soplex->getDual(dv);
+		    }
 		    return _dual_values[i];
+		  }
 		  LpSoplex::Value LpSoplex::_getPrimalValue() const {
 		    return soplex->objValue();
+		  }
 		  bool LpSoplex::_isBasicCol(int i) const {
 		    return soplex->getBasisColStatus(i) == soplex::SPxSolver::BASIC;
 		  LpSoplex::VarStatus LpSoplex::_getColStatus(int i) const {
 		    switch (soplex->getBasisColStatus(i)) {
 		    case soplex::SPxSolver::BASIC:
 		      return BASIC;
 		    case soplex::SPxSolver::ON_UPPER:
 		      return UPPER;
 		    case soplex::SPxSolver::ON_LOWER:
 		      return LOWER;
 		    case soplex::SPxSolver::FIXED:
 		      return FIXED;
 		    case soplex::SPxSolver::ZERO:
 		      return FREE;
 		    default:
 		      LEMON_ASSERT(false, "Wrong column status");
 		      return VarStatus();
+		    }
+		  }
 		  LpSoplex::SolutionStatus LpSoplex::_getPrimalStatus() const {
 		    if (!solved) return UNDEFINED;
 		  LpSoplex::VarStatus LpSoplex::_getRowStatus(int i) const {
 		    switch (soplex->getBasisRowStatus(i)) {
 		    case soplex::SPxSolver::BASIC:
 		      return BASIC;
 		    case soplex::SPxSolver::ON_UPPER:
 		      return UPPER;
 		    case soplex::SPxSolver::ON_LOWER:
 		      return LOWER;
 		    case soplex::SPxSolver::FIXED:
 		      return FIXED;
 		    case soplex::SPxSolver::ZERO:
 		      return FREE;
 		    default:
 		      LEMON_ASSERT(false, "Wrong row status");
 		      return VarStatus();
+		    }
+		  }
 		  LpSoplex::Value LpSoplex::_getPrimalRay(int i) const {
 		    if (_primal_ray.empty()) {
 		      _primal_ray.resize(soplex->nCols());
 		      soplex::Vector pv(_primal_ray.size(), &_primal_ray.front());
 		      soplex->getDualfarkas(pv);
+		    }
 		    return _primal_ray[i];
+		  }
 		  LpSoplex::Value LpSoplex::_getDualRay(int i) const {
 		    if (_dual_ray.empty()) {
 		      _dual_ray.resize(soplex->nRows());
 		      soplex::Vector dv(_dual_ray.size(), &_dual_ray.front());
 		      soplex->getDualfarkas(dv);
+		    }
 		    return _dual_ray[i];
+		  }
 		  LpSoplex::ProblemType LpSoplex::_getPrimalType() const {
 		    switch (soplex->status()) {
 		    case soplex::SPxSolver::OPTIMAL:
 		      return OPTIMAL;
 		    case soplex::SPxSolver::UNBOUNDED:
-		      return INFINITE;
+		      return UNBOUNDED;
 		    case soplex::SPxSolver::INFEASIBLE:
 		      return INFEASIBLE;
 		    default:
 		      return UNDEFINED;
+		    }
+		  }
 		  LpSoplex::SolutionStatus LpSoplex::_getDualStatus() const {
 		    if (!solved) return UNDEFINED;
 		  LpSoplex::ProblemType LpSoplex::_getDualType() const {
 		    switch (soplex->status()) {
 		    case soplex::SPxSolver::OPTIMAL:
 		      return OPTIMAL;
 		    case soplex::SPxSolver::UNBOUNDED:
 		      return UNBOUNDED;
 		    case soplex::SPxSolver::INFEASIBLE:
 		      return INFEASIBLE;
 		    default:
 		      return UNDEFINED;
+		    }
+		  }
 		  LpSoplex::ProblemTypes LpSoplex::_getProblemType() const {
 		    if (!solved) return UNKNOWN;
 		    switch (soplex->status()) {
 		    case soplex::SPxSolver::OPTIMAL:
 		      return PRIMAL_DUAL_FEASIBLE;
 		    case soplex::SPxSolver::UNBOUNDED:
 		      return PRIMAL_FEASIBLE_DUAL_INFEASIBLE;
 		    default:
-		      return UNKNOWN;
+		  void LpSoplex::_setSense(Sense sense) {
 		    switch (sense) {
 		    case MIN:
 		      soplex->changeSense(soplex::SPxSolver::MINIMIZE);
 		      break;
 		    case MAX:
 		      soplex->changeSense(soplex::SPxSolver::MAXIMIZE);
+		    }
+		  }
 		  void LpSoplex::_setMax() {
 		    soplex->changeSense(soplex::SPxSolver::MAXIMIZE);
-		    solved = false;
+		  LpSoplex::Sense LpSoplex::_getSense() const {
 		    switch (soplex->spxSense()) {
 		    case soplex::SPxSolver::MAXIMIZE:
 		      return MAX;
 		    case soplex::SPxSolver::MINIMIZE:
 		      return MIN;
 		    default:
 		      LEMON_ASSERT(false, "Wrong sense.");
 		      return LpSoplex::Sense();
+		  }
 		  void LpSoplex::_setMin() {
 		    soplex->changeSense(soplex::SPxSolver::MINIMIZE);
 		    solved = false;
+		  }
 		  bool LpSoplex::_isMax() const {
 		    return soplex->spxSense() == soplex::SPxSolver::MAXIMIZE;
+		  }
 		  void LpSoplex::_clear() {
 		    soplex->clear();
 		    _col_names.clear();
 		    _col_names_ref.clear();
 		    _row_names.clear();
 		    _row_names_ref.clear();
 		    cols.clear();
 		    rows.clear();
 		    _clear_temporals();
+		  }
 		} //namespace lemon

lemon/lp_soplex.h

Show inline comments

@@ -34,87 +34,118 @@
 		namespace lemon {
 		  /// \ingroup lp_group
 		  ///
 		  /// \brief Interface for the SOPLEX solver
 		  ///
 		  /// This class implements an interface for the SoPlex LP solver.
 		  /// The SoPlex library is an object oriented lp solver library
 		  /// developed at the Konrad-Zuse-Zentrum f�r Informationstechnik
 		  /// Berlin (ZIB). You can find detailed information about it at the
 		  /// <tt>http://soplex.zib.de</tt> address.
 		  class LpSoplex :virtual public LpSolverBase {
 		  protected:
 		    _lp_bits::RelocateIdHandler relocateIdHandler;
 		  class LpSoplex : public LpSolver {
 		  private:
 		    soplex::SoPlex* soplex;
 		    bool solved;
 		    std::vector<std::string> colNames;
 		    std::map<std::string, int> invColNames;
 		    std::vector<std::string> _col_names;
 		    std::map<std::string, int> _col_names_ref;
 		    std::vector<Value> primal_value;
 		    std::vector<Value> dual_value;
 		    std::vector<std::string> _row_names;
 		    std::map<std::string, int> _row_names_ref;
 		  private:
 		    // these values cannot be retrieved element by element
 		    mutable std::vector<Value> _primal_values;
 		    mutable std::vector<Value> _dual_values;
 		    mutable std::vector<Value> _primal_ray;
 		    mutable std::vector<Value> _dual_ray;
 		    void _clear_temporals();
 		  public:
 		    typedef LpSolverBase Parent;
 		    /// \e
 		    LpSoplex();
 		    /// \e
 		    LpSoplex(const LpSoplex&);
 		    /// \e
 		    ~LpSoplex();
 		  protected:
 		    virtual LpSolverBase* _newLp();
 		    virtual LpSolverBase* _copyLp();
 		    virtual LpSoplex* _newSolver() const;
 		    virtual LpSoplex* _cloneSolver() const;
 		    virtual const char* _solverName() const;
 		    virtual int _addCol();
 		    virtual int _addRow();
 		    virtual void _eraseCol(int i);
 		    virtual void _eraseRow(int i);
 		    virtual void _eraseColId(int i);
 		    virtual void _eraseRowId(int i);
 		    virtual void _getColName(int col, std::string & name) const;
 		    virtual void _setColName(int col, const std::string & name);
 		    virtual int _colByName(const std::string& name) const;
 		    virtual void _setRowCoeffs(int i, ConstRowIterator b, ConstRowIterator e);
 		    virtual void _getRowCoeffs(int i, RowIterator b) const;
 		    virtual void _setColCoeffs(int i, ConstColIterator b, ConstColIterator e);
 		    virtual void _getColCoeffs(int i, ColIterator b) const;
 		    virtual void _getRowName(int row, std::string& name) const;
 		    virtual void _setRowName(int row, const std::string& name);
 		    virtual int _rowByName(const std::string& name) const;
 		    virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e);
 		    virtual void _getRowCoeffs(int i, InsertIterator b) const;
 		    virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e);
 		    virtual void _getColCoeffs(int i, InsertIterator b) const;
 		    virtual void _setCoeff(int row, int col, Value value);
 		    virtual Value _getCoeff(int row, int col) const;
 		    virtual void _setColLowerBound(int i, Value value);
 		    virtual Value _getColLowerBound(int i) const;
 		    virtual void _setColUpperBound(int i, Value value);
 		    virtual Value _getColUpperBound(int i) const;
 		    virtual void _setRowBounds(int i, Value lower, Value upper);
 		    virtual void _getRowBounds(int i, Value &lower, Value &upper) const;
 		    virtual void _setRowLowerBound(int i, Value value);
 		    virtual Value _getRowLowerBound(int i) const;
 		    virtual void _setRowUpperBound(int i, Value value);
 		    virtual Value _getRowUpperBound(int i) const;
 		    virtual void _setObjCoeffs(ExprIterator b, ExprIterator e);
 		    virtual void _getObjCoeffs(InsertIterator b) const;
 		    virtual void _setObjCoeff(int i, Value obj_coef);
 		    virtual Value _getObjCoeff(int i) const;
-		    virtual void _clearObj();
 		    virtual void _setSense(Sense sense);
 		    virtual Sense _getSense() const;
 		    virtual SolveExitStatus _solve();
 		    virtual Value _getPrimal(int i) const;
 		    virtual Value _getDual(int i) const;
 		    virtual Value _getPrimalValue() const;
 		    virtual bool _isBasicCol(int i) const;
 		    virtual SolutionStatus _getPrimalStatus() const;
 		    virtual SolutionStatus _getDualStatus() const;
-		    virtual ProblemTypes _getProblemType() const;
+		    virtual Value _getPrimalRay(int i) const;
 		    virtual Value _getDualRay(int i) const;
 		    virtual VarStatus _getColStatus(int i) const;
 		    virtual VarStatus _getRowStatus(int i) const;
 		    virtual void _setMax();
 		    virtual void _setMin();
-		    virtual bool _isMax() const;
+		    virtual ProblemType _getPrimalType() const;
 		    virtual ProblemType _getDualType() const;
 		    virtual void _clear();
 		  };
 		} //END OF NAMESPACE LEMON
 		#endif //LEMON_LP_SOPLEX_H

lemon/bits/lp_id.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2008
 		 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 		 * (Egervary Research Group on Combinatorial Optimization, EGRES).
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#ifndef LEMON_BITS_LP_SOLVER_ID_H
 		#define LEMON_BITS_LP_SOLVER_ID_H
 		namespace lemon {
 		  namespace _lp_bits {
 		    struct LpIdImpl {
 		      std::vector<int> index;
 		      std::vector<int> cross;
 		      int first_index;
 		      int first_free;
 		    };
 		    class LpId {
 		    public:
 		      class IdHandler {
 		      public:
 		        virtual ~IdHandler() {}
 		        virtual int addId(LpIdImpl&) = 0;
 		        virtual void eraseId(LpIdImpl&, int xn) = 0;
 		      };
 		      LpId(int min_index = 0) {
 		        id_handler = 0;
 		        impl.first_free = -1;
 		        impl.first_index = min_index;
 		        impl.cross.resize(impl.first_index);
+		      }
 		      LpId(const LpId& li) {
 		        id_handler = 0;
 		        impl = li.impl;
+		      }
 		      LpId& operator=(const LpId& li) {
 		        id_handler = 0;
 		        impl = li.impl;
 		        return *this;
+		      }
 		      void setIdHandler(IdHandler& ih) {
 		        id_handler = &ih;
+		      }
 		      int fixId(int fn) const {return impl.cross[fn];}
 		      int floatingId(int xn) const {return impl.index[xn];}
 		      int addId() {
 		        if (id_handler == 0) {
 		          int xn, fn = impl.cross.size();
 		          if (impl.first_free == -1) {
 		            xn = impl.index.size();
 		            impl.index.push_back(fn);
 		          } else {
 		            xn = impl.first_free;
 		            impl.first_free = impl.index[impl.first_free];
 		            impl.index[xn] = fn;
+		          }
 		          impl.cross.push_back(xn);
 		          return xn;
 		        } else {
 		          return id_handler->addId(impl);
+		        }
+		      }
 		      void eraseId(int xn) {
 		        if (id_handler == 0) {
 		          int fn = impl.index[xn];
 		          impl.index[xn] = impl.first_free;
 		          impl.first_free = xn;
 		          for(int i = fn + 1; i < int(impl.cross.size()); ++i) {
 		            impl.cross[i - 1] = impl.cross[i];
 		            impl.index[impl.cross[i]]--;
+		          }
 		          impl.cross.pop_back();
 		        } else {
 		          id_handler->eraseId(impl, xn);
+		        }
+		      }
 		      void firstFloating(int& fn) const {
 		        fn = impl.first_index;
 		        if (fn == int(impl.cross.size())) fn = -1;
+		      }
 		      void nextFloating(int& fn) const {
 		        ++fn;
 		        if (fn == int(impl.cross.size())) fn = -1;
+		      }
 		      void firstFix(int& xn) const {
 		        int fn;
 		        firstFloating(fn);
 		        xn = fn != -1 ? fixId(fn) : -1;
+		      }
 		      void nextFix(int& xn) const {
 		        int fn = floatingId(xn);
 		        nextFloating(fn);
 		        xn = fn != -1 ? fixId(fn) : -1;
+		      }
 		    protected:
 		      LpIdImpl impl;
 		      IdHandler *id_handler;
 		    };
 		    class RelocateIdHandler : public LpId::IdHandler {
 		    public:
 		      virtual int addId(LpIdImpl& impl) {
 		        int xn, fn = impl.cross.size();
 		        if (impl.first_free == -1) {
 		          xn = impl.index.size();
 		          impl.index.push_back(fn);
 		        } else {
 		          xn = impl.first_free;
 		          impl.first_free = impl.index[impl.first_free];
 		          impl.index[xn] = fn;
+		        }
 		        impl.cross.push_back(xn);
 		        return xn;
+		      }
 		      virtual void eraseId(LpIdImpl& impl, int xn) {
 		        int fn = impl.index[xn];
 		        impl.index[xn] = impl.first_free;
 		        impl.first_free = xn;
 		        impl.cross[fn] = impl.cross.back();
 		        impl.index[impl.cross.back()] = fn;
 		        impl.cross.pop_back();
+		      }
 		    };
+		  }
+		}
 		#endif

lemon/mip_cplex.cc

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 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2008
 		 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 		 * (Egervary Research Group on Combinatorial Optimization, EGRES).
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		///\file
 		///\brief Implementation of the LEMON-CPLEX mip solver interface.
 		#include <lemon/mip_cplex.h>
 		extern "C" {
 		#include <ilcplex/cplex.h>
+		}
 		namespace lemon {
 		  MipCplex::MipCplex() {
 		    //This is unnecessary: setting integrality constraints on
 		    //variables will set this, too
 		    ///\todo The constant CPXPROB_MIP is
 		    ///called CPXPROB_MILP in later versions
 		#if CPX_VERSION < 800
 		    CPXchgprobtype( env,  lp, CPXPROB_MIP);
 		#else
 		    CPXchgprobtype( env,  lp, CPXPROB_MILP);
 		#endif
+		  }
 		  void MipCplex::_colType(int i, MipCplex::ColTypes col_type){
 		    // Note If a variable is to be changed to binary, a call to CPXchgbds
 		    // should also be made to change the bounds to 0 and 1.
 		    int indices[1];
 		    indices[0]=i;
 		    char ctype[1];
 		    switch (col_type){
 		      case INT:
 		        ctype[0]=CPX_INTEGER;//'I'
 		        break;
 		      case REAL:
 		        ctype[0]=CPX_CONTINUOUS        ;//'C'
 		        break;
 		    default:;
 		        //FIXME problem
+		    }
 		    CPXchgctype (env, lp, 1, indices, ctype);
+		  }
 		  MipCplex::ColTypes MipCplex::_colType(int i) const {
 		    char ctype[1];
 		    CPXgetctype (env, lp, ctype, i, i);
 		    switch (ctype[0]){
 		    case CPX_INTEGER:
 		      return INT;
 		    case CPX_CONTINUOUS:
 		      return REAL;
 		    default:
 		      return REAL;//Error!
+		    }
+		  }
 		  LpCplex::SolveExitStatus MipCplex::_solve(){
 		    status = CPXmipopt (env, lp);
 		    if (status==0)
 		      return SOLVED;
 		    else
 		      return UNSOLVED;
+		  }
 		  LpCplex::SolutionStatus MipCplex::_getMipStatus() const {
 		    int stat = CPXgetstat(env, lp);
 		    //Fortunately, MIP statuses did not change for cplex 8.0
 		    switch (stat)
+		    {
 		      case CPXMIP_OPTIMAL:
 		        // Optimal integer solution has been found.
 		      case CPXMIP_OPTIMAL_TOL:
 		        // Optimal soluton with the tolerance defined by epgap or epagap has
 		        // been found.
 		        return OPTIMAL;
 		        //This also exists in later issues
 		        //    case CPXMIP_UNBOUNDED:
 		        //return INFINITE;
 		      case CPXMIP_INFEASIBLE:
 		        return INFEASIBLE;
 		      default:
 		        return UNDEFINED;
+		    }
 		    //Unboundedness not treated well: the following is from cplex 9.0 doc
 		    // About Unboundedness
 		    // The treatment of models that are unbounded involves a few
 		    // subtleties. Specifically, a declaration of unboundedness means that
 		    // ILOG CPLEX has determined that the model has an unbounded
 		    // ray. Given any feasible solution x with objective z, a multiple of
 		    // the unbounded ray can be added to x to give a feasible solution
 		    // with objective z-1 (or z+1 for maximization models). Thus, if a
 		    // feasible solution exists, then the optimal objective is
 		    // unbounded. Note that ILOG CPLEX has not necessarily concluded that
 		    // a feasible solution exists. Users can call the routine CPXsolninfo
 		    // to determine whether ILOG CPLEX has also concluded that the model
 		    // has a feasible solution.
+		  }
 		  MipCplex::Value MipCplex::_getPrimal(int i) const {
 		    Value x;
 		    CPXgetmipx(env, lp, &x, i, i);
 		    return x;
+		  }
 		  MipCplex::Value MipCplex::_getPrimalValue() const {
 		    Value objval;
 		    CPXgetmipobjval(env, lp, &objval);
 		    return objval;
+		  }
 		} //END OF NAMESPACE LEMON

lemon/mip_cplex.h

Show inline comments

 		/* -*- mode: C++; indent-tabs-mode: nil; -*-
+		 *
 		 * This file is a part of LEMON, a generic C++ optimization library.
+		 *
 		 * Copyright (C) 2003-2008
 		 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 		 * (Egervary Research Group on Combinatorial Optimization, EGRES).
+		 *
 		 * Permission to use, modify and distribute this software is granted
 		 * provided that this copyright notice appears in all copies. For
 		 * precise terms see the accompanying LICENSE file.
+		 *
 		 * This software is provided "AS IS" with no warranty of any kind,
 		 * express or implied, and with no claim as to its suitability for any
 		 * purpose.
+		 *
 		 */
 		#ifndef LEMON_MIP_CPLEX_H
 		#define LEMON_MIP_CPLEX_H
 		///\file
 		///\brief Header of the LEMON-CPLEX mip solver interface.
 		///\ingroup lp_group
 		#include <lemon/lp_cplex.h>
 		namespace lemon {
 		  /// \brief Interface for the CPLEX MIP solver
 		  ///
 		  /// This class implements an interface for the CPLEX MIP solver.
 		  ///\ingroup lp_group
 		  class MipCplex : public MipSolverBase, public LpCplex{
 		  public:
 		    typedef MipSolverBase ParentMip;
 		    typedef LpCplex ParentLp;
 		    MipCplex();
 		    //~MipCplex();
 		  protected:
 		    virtual ColTypes _colType(int col) const;
 		    virtual void _colType(int col, ColTypes col_type);
 		    virtual LpCplex::SolveExitStatus _solve();
 		    virtual LpCplex::SolutionStatus _getMipStatus() const;
 		    virtual ParentLp::Value _getPrimal(int i) const;
 		    virtual ParentLp::Value _getPrimalValue() const;
 		  };
 		} //END OF NAMESPACE LEMON
 		#endif // END OF LEMON_MIP_CPLEX_H

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