[461] | 1 | /* -*- mode: C++; indent-tabs-mode: nil; -*- |
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| 2 | * |
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| 3 | * This file is a part of LEMON, a generic C++ optimization library. |
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| 4 | * |
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| 5 | * Copyright (C) 2003-2008 |
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| 6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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| 7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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| 8 | * |
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| 9 | * Permission to use, modify and distribute this software is granted |
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| 10 | * provided that this copyright notice appears in all copies. For |
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| 11 | * precise terms see the accompanying LICENSE file. |
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| 12 | * |
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| 13 | * This software is provided "AS IS" with no warranty of any kind, |
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| 14 | * express or implied, and with no claim as to its suitability for any |
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| 15 | * purpose. |
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| 16 | * |
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| 17 | */ |
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| 18 | |
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| 19 | #ifndef LEMON_GLPK_H |
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| 20 | #define LEMON_GLPK_H |
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| 21 | |
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| 22 | ///\file |
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| 23 | ///\brief Header of the LEMON-GLPK lp solver interface. |
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| 24 | ///\ingroup lp_group |
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| 25 | |
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| 26 | #include <lemon/lp_base.h> |
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| 27 | |
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| 28 | namespace lemon { |
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| 29 | |
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[832] | 30 | namespace _solver_bits { |
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| 31 | class VoidPtr { |
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| 32 | private: |
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| 33 | void *_ptr; |
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| 34 | public: |
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| 35 | VoidPtr() : _ptr(0) {} |
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| 36 | |
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| 37 | template <typename T> |
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| 38 | VoidPtr(T* ptr) : _ptr(reinterpret_cast<void*>(ptr)) {} |
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| 39 | |
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| 40 | template <typename T> |
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| 41 | VoidPtr& operator=(T* ptr) { |
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| 42 | _ptr = reinterpret_cast<void*>(ptr); |
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| 43 | return *this; |
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| 44 | } |
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| 45 | |
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| 46 | template <typename T> |
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| 47 | operator T*() const { return reinterpret_cast<T*>(_ptr); } |
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| 48 | }; |
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| 49 | } |
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[461] | 50 | |
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| 51 | /// \brief Base interface for the GLPK LP and MIP solver |
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| 52 | /// |
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| 53 | /// This class implements the common interface of the GLPK LP and MIP solver. |
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| 54 | /// \ingroup lp_group |
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| 55 | class GlpkBase : virtual public LpBase { |
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| 56 | protected: |
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| 57 | |
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[832] | 58 | _solver_bits::VoidPtr lp; |
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[461] | 59 | |
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| 60 | GlpkBase(); |
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| 61 | GlpkBase(const GlpkBase&); |
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| 62 | virtual ~GlpkBase(); |
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| 63 | |
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| 64 | protected: |
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| 65 | |
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| 66 | virtual int _addCol(); |
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| 67 | virtual int _addRow(); |
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| 68 | |
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| 69 | virtual void _eraseCol(int i); |
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| 70 | virtual void _eraseRow(int i); |
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| 71 | |
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| 72 | virtual void _eraseColId(int i); |
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| 73 | virtual void _eraseRowId(int i); |
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| 74 | |
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| 75 | virtual void _getColName(int col, std::string& name) const; |
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| 76 | virtual void _setColName(int col, const std::string& name); |
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| 77 | virtual int _colByName(const std::string& name) const; |
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| 78 | |
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| 79 | virtual void _getRowName(int row, std::string& name) const; |
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| 80 | virtual void _setRowName(int row, const std::string& name); |
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| 81 | virtual int _rowByName(const std::string& name) const; |
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| 82 | |
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| 83 | virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e); |
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| 84 | virtual void _getRowCoeffs(int i, InsertIterator b) const; |
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| 85 | |
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| 86 | virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e); |
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| 87 | virtual void _getColCoeffs(int i, InsertIterator b) const; |
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| 88 | |
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| 89 | virtual void _setCoeff(int row, int col, Value value); |
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| 90 | virtual Value _getCoeff(int row, int col) const; |
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| 91 | |
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| 92 | virtual void _setColLowerBound(int i, Value value); |
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| 93 | virtual Value _getColLowerBound(int i) const; |
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| 94 | |
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| 95 | virtual void _setColUpperBound(int i, Value value); |
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| 96 | virtual Value _getColUpperBound(int i) const; |
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| 97 | |
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| 98 | virtual void _setRowLowerBound(int i, Value value); |
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| 99 | virtual Value _getRowLowerBound(int i) const; |
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| 100 | |
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| 101 | virtual void _setRowUpperBound(int i, Value value); |
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| 102 | virtual Value _getRowUpperBound(int i) const; |
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| 103 | |
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| 104 | virtual void _setObjCoeffs(ExprIterator b, ExprIterator e); |
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| 105 | virtual void _getObjCoeffs(InsertIterator b) const; |
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| 106 | |
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| 107 | virtual void _setObjCoeff(int i, Value obj_coef); |
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| 108 | virtual Value _getObjCoeff(int i) const; |
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| 109 | |
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| 110 | virtual void _setSense(Sense); |
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| 111 | virtual Sense _getSense() const; |
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| 112 | |
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| 113 | virtual void _clear(); |
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| 114 | |
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[576] | 115 | virtual void _messageLevel(MessageLevel level); |
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| 116 | |
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[538] | 117 | private: |
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| 118 | |
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| 119 | static void freeEnv(); |
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| 120 | |
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| 121 | struct FreeEnvHelper { |
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| 122 | ~FreeEnvHelper() { |
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| 123 | freeEnv(); |
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| 124 | } |
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| 125 | }; |
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| 126 | |
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| 127 | static FreeEnvHelper freeEnvHelper; |
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[576] | 128 | |
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| 129 | protected: |
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| 130 | |
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| 131 | int _message_level; |
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[538] | 132 | |
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[461] | 133 | public: |
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| 134 | |
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| 135 | ///Pointer to the underlying GLPK data structure. |
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[832] | 136 | _solver_bits::VoidPtr lpx() {return lp;} |
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[461] | 137 | ///Const pointer to the underlying GLPK data structure. |
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[832] | 138 | _solver_bits::VoidPtr lpx() const {return lp;} |
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[461] | 139 | |
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| 140 | ///Returns the constraint identifier understood by GLPK. |
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| 141 | int lpxRow(Row r) const { return rows(id(r)); } |
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| 142 | |
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| 143 | ///Returns the variable identifier understood by GLPK. |
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| 144 | int lpxCol(Col c) const { return cols(id(c)); } |
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| 145 | |
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| 146 | }; |
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| 147 | |
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| 148 | /// \brief Interface for the GLPK LP solver |
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| 149 | /// |
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| 150 | /// This class implements an interface for the GLPK LP solver. |
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| 151 | ///\ingroup lp_group |
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[540] | 152 | class GlpkLp : public LpSolver, public GlpkBase { |
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[461] | 153 | public: |
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| 154 | |
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| 155 | ///\e |
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[462] | 156 | GlpkLp(); |
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[461] | 157 | ///\e |
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[462] | 158 | GlpkLp(const GlpkLp&); |
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[461] | 159 | |
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[540] | 160 | ///\e |
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| 161 | virtual GlpkLp* cloneSolver() const; |
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| 162 | ///\e |
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| 163 | virtual GlpkLp* newSolver() const; |
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| 164 | |
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[461] | 165 | private: |
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| 166 | |
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| 167 | mutable std::vector<double> _primal_ray; |
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| 168 | mutable std::vector<double> _dual_ray; |
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| 169 | |
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| 170 | void _clear_temporals(); |
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| 171 | |
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| 172 | protected: |
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| 173 | |
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| 174 | virtual const char* _solverName() const; |
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| 175 | |
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| 176 | virtual SolveExitStatus _solve(); |
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| 177 | virtual Value _getPrimal(int i) const; |
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| 178 | virtual Value _getDual(int i) const; |
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| 179 | |
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| 180 | virtual Value _getPrimalValue() const; |
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| 181 | |
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| 182 | virtual VarStatus _getColStatus(int i) const; |
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| 183 | virtual VarStatus _getRowStatus(int i) const; |
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| 184 | |
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| 185 | virtual Value _getPrimalRay(int i) const; |
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| 186 | virtual Value _getDualRay(int i) const; |
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| 187 | |
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| 188 | virtual ProblemType _getPrimalType() const; |
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| 189 | virtual ProblemType _getDualType() const; |
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| 190 | |
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| 191 | public: |
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| 192 | |
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| 193 | ///Solve with primal simplex |
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| 194 | SolveExitStatus solvePrimal(); |
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| 195 | |
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| 196 | ///Solve with dual simplex |
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| 197 | SolveExitStatus solveDual(); |
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| 198 | |
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[565] | 199 | private: |
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| 200 | |
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| 201 | bool _presolve; |
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| 202 | |
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| 203 | public: |
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| 204 | |
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[461] | 205 | ///Turns on or off the presolver |
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| 206 | |
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| 207 | ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver |
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| 208 | /// |
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| 209 | ///The presolver is off by default. |
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[565] | 210 | void presolver(bool presolve); |
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[461] | 211 | |
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| 212 | }; |
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| 213 | |
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| 214 | /// \brief Interface for the GLPK MIP solver |
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| 215 | /// |
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| 216 | /// This class implements an interface for the GLPK MIP solver. |
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| 217 | ///\ingroup lp_group |
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[540] | 218 | class GlpkMip : public MipSolver, public GlpkBase { |
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[461] | 219 | public: |
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| 220 | |
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| 221 | ///\e |
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[462] | 222 | GlpkMip(); |
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[461] | 223 | ///\e |
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[462] | 224 | GlpkMip(const GlpkMip&); |
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[461] | 225 | |
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[540] | 226 | virtual GlpkMip* cloneSolver() const; |
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| 227 | virtual GlpkMip* newSolver() const; |
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| 228 | |
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[461] | 229 | protected: |
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| 230 | |
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| 231 | virtual const char* _solverName() const; |
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| 232 | |
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| 233 | virtual ColTypes _getColType(int col) const; |
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| 234 | virtual void _setColType(int col, ColTypes col_type); |
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| 235 | |
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| 236 | virtual SolveExitStatus _solve(); |
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| 237 | virtual ProblemType _getType() const; |
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| 238 | virtual Value _getSol(int i) const; |
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| 239 | virtual Value _getSolValue() const; |
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| 240 | |
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| 241 | }; |
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| 242 | |
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| 243 | |
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| 244 | } //END OF NAMESPACE LEMON |
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| 245 | |
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| 246 | #endif //LEMON_GLPK_H |
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| 247 | |
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