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) 2003-2013 |
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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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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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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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58 | _solver_bits::VoidPtr lp; |
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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 | virtual int _addRow(Value l, ExprIterator b, ExprIterator e, Value u); |
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69 | |
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70 | virtual void _eraseCol(int i); |
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71 | virtual void _eraseRow(int i); |
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72 | |
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73 | virtual void _eraseColId(int i); |
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74 | virtual void _eraseRowId(int i); |
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75 | |
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76 | virtual void _getColName(int col, std::string& name) const; |
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77 | virtual void _setColName(int col, const std::string& name); |
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78 | virtual int _colByName(const std::string& name) const; |
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79 | |
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80 | virtual void _getRowName(int row, std::string& name) const; |
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81 | virtual void _setRowName(int row, const std::string& name); |
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82 | virtual int _rowByName(const std::string& name) const; |
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83 | |
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84 | virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e); |
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85 | virtual void _getRowCoeffs(int i, InsertIterator b) const; |
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86 | |
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87 | virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e); |
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88 | virtual void _getColCoeffs(int i, InsertIterator b) const; |
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89 | |
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90 | virtual void _setCoeff(int row, int col, Value value); |
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91 | virtual Value _getCoeff(int row, int col) const; |
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92 | |
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93 | virtual void _setColLowerBound(int i, Value value); |
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94 | virtual Value _getColLowerBound(int i) const; |
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95 | |
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96 | virtual void _setColUpperBound(int i, Value value); |
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97 | virtual Value _getColUpperBound(int i) const; |
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98 | |
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99 | virtual void _setRowLowerBound(int i, Value value); |
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100 | virtual Value _getRowLowerBound(int i) const; |
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101 | |
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102 | virtual void _setRowUpperBound(int i, Value value); |
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103 | virtual Value _getRowUpperBound(int i) const; |
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104 | |
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105 | virtual void _setObjCoeffs(ExprIterator b, ExprIterator e); |
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106 | virtual void _getObjCoeffs(InsertIterator b) const; |
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107 | |
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108 | virtual void _setObjCoeff(int i, Value obj_coef); |
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109 | virtual Value _getObjCoeff(int i) const; |
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110 | |
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111 | virtual void _setSense(Sense); |
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112 | virtual Sense _getSense() const; |
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113 | |
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114 | virtual void _clear(); |
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115 | |
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116 | virtual void _messageLevel(MessageLevel level); |
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117 | |
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118 | virtual void _write(std::string file, std::string format) const; |
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119 | |
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120 | private: |
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121 | |
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122 | static void freeEnv(); |
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123 | |
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124 | struct FreeEnvHelper { |
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125 | ~FreeEnvHelper() { |
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126 | freeEnv(); |
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127 | } |
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128 | }; |
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129 | |
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130 | static FreeEnvHelper freeEnvHelper; |
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131 | |
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132 | protected: |
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133 | |
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134 | int _message_level; |
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135 | |
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136 | public: |
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137 | |
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138 | ///Pointer to the underlying GLPK data structure. |
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139 | _solver_bits::VoidPtr lpx() {return lp;} |
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140 | ///Const pointer to the underlying GLPK data structure. |
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141 | _solver_bits::VoidPtr lpx() const {return lp;} |
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142 | |
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143 | ///Returns the constraint identifier understood by GLPK. |
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144 | int lpxRow(Row r) const { return _rows(id(r)); } |
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145 | |
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146 | ///Returns the variable identifier understood by GLPK. |
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147 | int lpxCol(Col c) const { return _cols(id(c)); } |
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148 | |
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149 | #ifdef DOXYGEN |
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150 | /// Write the problem or the solution to a file in the given format |
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151 | |
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152 | /// This function writes the problem or the solution |
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153 | /// to a file in the given format. |
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154 | /// Trying to write in an unsupported format will trigger |
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155 | /// \ref LpBase::UnsupportedFormatError. |
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156 | /// \param file The file path |
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157 | /// \param format The output file format. |
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158 | /// Supportted formats are "MPS" and "LP". |
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159 | void write(std::string file, std::string format = "MPS") const {} |
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160 | #endif |
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161 | |
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162 | }; |
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163 | |
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164 | /// \brief Interface for the GLPK LP solver |
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165 | /// |
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166 | /// This class implements an interface for the GLPK LP solver. |
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167 | ///\ingroup lp_group |
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168 | class GlpkLp : public LpSolver, public GlpkBase { |
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169 | public: |
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170 | |
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171 | ///\e |
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172 | GlpkLp(); |
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173 | ///\e |
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174 | GlpkLp(const GlpkLp&); |
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175 | |
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176 | ///\e |
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177 | virtual GlpkLp* cloneSolver() const; |
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178 | ///\e |
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179 | virtual GlpkLp* newSolver() const; |
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180 | |
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181 | private: |
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182 | |
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183 | mutable std::vector<double> _primal_ray; |
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184 | mutable std::vector<double> _dual_ray; |
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185 | |
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186 | void _clear_temporals(); |
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187 | |
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188 | protected: |
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189 | |
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190 | virtual const char* _solverName() const; |
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191 | |
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192 | virtual SolveExitStatus _solve(); |
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193 | virtual Value _getPrimal(int i) const; |
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194 | virtual Value _getDual(int i) const; |
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195 | |
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196 | virtual Value _getPrimalValue() const; |
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197 | |
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198 | virtual VarStatus _getColStatus(int i) const; |
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199 | virtual VarStatus _getRowStatus(int i) const; |
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200 | |
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201 | virtual Value _getPrimalRay(int i) const; |
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202 | virtual Value _getDualRay(int i) const; |
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203 | |
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204 | virtual ProblemType _getPrimalType() const; |
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205 | virtual ProblemType _getDualType() const; |
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206 | |
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207 | public: |
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208 | |
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209 | ///Solve with primal simplex |
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210 | SolveExitStatus solvePrimal(); |
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211 | |
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212 | ///Solve with dual simplex |
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213 | SolveExitStatus solveDual(); |
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214 | |
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215 | private: |
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216 | |
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217 | bool _presolve; |
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218 | |
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219 | public: |
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220 | |
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221 | ///Turns on or off the presolver |
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222 | |
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223 | ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver |
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224 | /// |
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225 | ///The presolver is off by default. |
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226 | void presolver(bool presolve); |
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227 | |
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228 | }; |
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229 | |
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230 | /// \brief Interface for the GLPK MIP solver |
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231 | /// |
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232 | /// This class implements an interface for the GLPK MIP solver. |
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233 | ///\ingroup lp_group |
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234 | class GlpkMip : public MipSolver, public GlpkBase { |
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235 | public: |
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236 | |
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237 | ///\e |
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238 | GlpkMip(); |
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239 | ///\e |
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240 | GlpkMip(const GlpkMip&); |
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241 | |
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242 | virtual GlpkMip* cloneSolver() const; |
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243 | virtual GlpkMip* newSolver() const; |
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244 | |
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245 | protected: |
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246 | |
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247 | virtual const char* _solverName() const; |
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248 | |
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249 | virtual ColTypes _getColType(int col) const; |
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250 | virtual void _setColType(int col, ColTypes col_type); |
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251 | |
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252 | virtual SolveExitStatus _solve(); |
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253 | virtual ProblemType _getType() const; |
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254 | virtual Value _getSol(int i) const; |
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255 | virtual Value _getSolValue() const; |
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256 | |
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257 | }; |
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258 | |
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259 | |
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260 | } //END OF NAMESPACE LEMON |
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261 | |
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262 | #endif //LEMON_GLPK_H |
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263 | |
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