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_LP_SKELETON_H |
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20 | #define LEMON_LP_SKELETON_H |
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21 | |
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22 | #include <lemon/lp_base.h> |
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23 | |
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24 | ///\file |
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25 | ///\brief Skeleton file to implement LP/MIP solver interfaces |
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26 | /// |
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27 | ///The classes in this file do nothing, but they can serve as skeletons when |
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28 | ///implementing an interface to new solvers. |
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29 | namespace lemon { |
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30 | |
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31 | ///A skeleton class to implement LP/MIP solver base interface |
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32 | |
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33 | ///This class does nothing, but it can serve as a skeleton when |
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34 | ///implementing an interface to new solvers. |
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35 | class SkeletonSolverBase : public virtual LpBase { |
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36 | int col_num,row_num; |
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37 | |
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38 | protected: |
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39 | |
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40 | SkeletonSolverBase() |
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41 | : col_num(-1), row_num(-1) {} |
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42 | |
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43 | /// \e |
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44 | virtual int _addCol(); |
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45 | /// \e |
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46 | virtual int _addRow(); |
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47 | /// \e |
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48 | virtual int _addRow(Value l, ExprIterator b, ExprIterator e, Value u); |
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49 | /// \e |
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50 | virtual void _eraseCol(int i); |
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51 | /// \e |
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52 | virtual void _eraseRow(int i); |
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53 | |
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54 | /// \e |
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55 | virtual void _getColName(int col, std::string& name) const; |
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56 | /// \e |
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57 | virtual void _setColName(int col, const std::string& name); |
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58 | /// \e |
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59 | virtual int _colByName(const std::string& name) const; |
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60 | |
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61 | /// \e |
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62 | virtual void _getRowName(int row, std::string& name) const; |
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63 | /// \e |
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64 | virtual void _setRowName(int row, const std::string& name); |
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65 | /// \e |
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66 | virtual int _rowByName(const std::string& name) const; |
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67 | |
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68 | /// \e |
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69 | virtual void _setRowCoeffs(int i, ExprIterator b, ExprIterator e); |
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70 | /// \e |
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71 | virtual void _getRowCoeffs(int i, InsertIterator b) const; |
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72 | /// \e |
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73 | virtual void _setColCoeffs(int i, ExprIterator b, ExprIterator e); |
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74 | /// \e |
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75 | virtual void _getColCoeffs(int i, InsertIterator b) const; |
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76 | |
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77 | /// Set one element of the coefficient matrix |
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78 | virtual void _setCoeff(int row, int col, Value value); |
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79 | |
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80 | /// Get one element of the coefficient matrix |
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81 | virtual Value _getCoeff(int row, int col) const; |
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82 | |
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83 | /// The lower bound of a variable (column) have to be given by an |
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84 | /// extended number of type Value, i.e. a finite number of type |
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85 | /// Value or -\ref INF. |
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86 | virtual void _setColLowerBound(int i, Value value); |
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87 | /// \e |
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88 | |
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89 | /// The lower bound of a variable (column) is an |
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90 | /// extended number of type Value, i.e. a finite number of type |
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91 | /// Value or -\ref INF. |
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92 | virtual Value _getColLowerBound(int i) const; |
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93 | |
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94 | /// The upper bound of a variable (column) have to be given by an |
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95 | /// extended number of type Value, i.e. a finite number of type |
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96 | /// Value or \ref INF. |
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97 | virtual void _setColUpperBound(int i, Value value); |
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98 | /// \e |
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99 | |
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100 | /// The upper bound of a variable (column) is an |
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101 | /// extended number of type Value, i.e. a finite number of type |
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102 | /// Value or \ref INF. |
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103 | virtual Value _getColUpperBound(int i) const; |
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104 | |
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105 | /// The lower bound of a constraint (row) have to be given by an |
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106 | /// extended number of type Value, i.e. a finite number of type |
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107 | /// Value or -\ref INF. |
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108 | virtual void _setRowLowerBound(int i, Value value); |
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109 | /// \e |
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110 | |
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111 | /// The lower bound of a constraint (row) is an |
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112 | /// extended number of type Value, i.e. a finite number of type |
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113 | /// Value or -\ref INF. |
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114 | virtual Value _getRowLowerBound(int i) const; |
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115 | |
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116 | /// The upper bound of a constraint (row) have to be given by an |
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117 | /// extended number of type Value, i.e. a finite number of type |
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118 | /// Value or \ref INF. |
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119 | virtual void _setRowUpperBound(int i, Value value); |
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120 | /// \e |
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121 | |
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122 | /// The upper bound of a constraint (row) is an |
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123 | /// extended number of type Value, i.e. a finite number of type |
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124 | /// Value or \ref INF. |
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125 | virtual Value _getRowUpperBound(int i) const; |
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126 | |
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127 | /// \e |
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128 | virtual void _setObjCoeffs(ExprIterator b, ExprIterator e); |
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129 | /// \e |
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130 | virtual void _getObjCoeffs(InsertIterator b) const; |
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131 | |
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132 | /// \e |
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133 | virtual void _setObjCoeff(int i, Value obj_coef); |
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134 | /// \e |
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135 | virtual Value _getObjCoeff(int i) const; |
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136 | |
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137 | ///\e |
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138 | virtual void _setSense(Sense); |
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139 | ///\e |
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140 | virtual Sense _getSense() const; |
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141 | |
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142 | ///\e |
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143 | virtual void _clear(); |
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144 | |
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145 | ///\e |
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146 | virtual void _messageLevel(MessageLevel); |
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147 | }; |
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148 | |
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149 | /// \brief Skeleton class for an LP solver interface |
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150 | /// |
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151 | ///This class does nothing, but it can serve as a skeleton when |
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152 | ///implementing an interface to new solvers. |
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153 | |
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154 | ///\ingroup lp_group |
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155 | class LpSkeleton : public LpSolver, public SkeletonSolverBase { |
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156 | public: |
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157 | ///\e |
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158 | LpSkeleton() : LpSolver(), SkeletonSolverBase() {} |
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159 | ///\e |
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160 | virtual LpSkeleton* newSolver() const; |
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161 | ///\e |
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162 | virtual LpSkeleton* cloneSolver() const; |
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163 | protected: |
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164 | |
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165 | ///\e |
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166 | virtual SolveExitStatus _solve(); |
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167 | |
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168 | ///\e |
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169 | virtual Value _getPrimal(int i) const; |
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170 | ///\e |
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171 | virtual Value _getDual(int i) const; |
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172 | |
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173 | ///\e |
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174 | virtual Value _getPrimalValue() const; |
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175 | |
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176 | ///\e |
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177 | virtual Value _getPrimalRay(int i) const; |
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178 | ///\e |
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179 | virtual Value _getDualRay(int i) const; |
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180 | |
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181 | ///\e |
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182 | virtual ProblemType _getPrimalType() const; |
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183 | ///\e |
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184 | virtual ProblemType _getDualType() const; |
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185 | |
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186 | ///\e |
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187 | virtual VarStatus _getColStatus(int i) const; |
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188 | ///\e |
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189 | virtual VarStatus _getRowStatus(int i) const; |
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190 | |
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191 | ///\e |
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192 | virtual const char* _solverName() const; |
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193 | |
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194 | }; |
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195 | |
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196 | /// \brief Skeleton class for a MIP solver interface |
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197 | /// |
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198 | ///This class does nothing, but it can serve as a skeleton when |
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199 | ///implementing an interface to new solvers. |
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200 | ///\ingroup lp_group |
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201 | class MipSkeleton : public MipSolver, public SkeletonSolverBase { |
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202 | public: |
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203 | ///\e |
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204 | MipSkeleton() : MipSolver(), SkeletonSolverBase() {} |
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205 | ///\e |
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206 | virtual MipSkeleton* newSolver() const; |
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207 | ///\e |
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208 | virtual MipSkeleton* cloneSolver() const; |
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209 | |
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210 | protected: |
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211 | ///\e |
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212 | virtual SolveExitStatus _solve(); |
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213 | |
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214 | ///\e |
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215 | virtual Value _getSol(int i) const; |
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216 | |
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217 | ///\e |
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218 | virtual Value _getSolValue() const; |
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219 | |
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220 | ///\e |
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221 | virtual ProblemType _getType() const; |
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222 | |
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223 | ///\e |
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224 | virtual const char* _solverName() const; |
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225 | }; |
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226 | |
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227 | } //namespace lemon |
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228 | |
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229 | #endif |
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