diff --git a/lemon/clp.cc b/lemon/clp.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.
+ *
+ */
+
+#include <lemon/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