1 | /* $Id: CbcBranchBase.cpp 1573 2011-01-05 01:12:36Z stefan $ */ |
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2 | // Copyright (C) 2002, International Business Machines |
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3 | // Corporation and others. All Rights Reserved. |
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4 | // This code is licensed under the terms of the Eclipse Public License (EPL). |
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5 | |
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6 | #if defined(_MSC_VER) |
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7 | // Turn off compiler warning about long names |
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8 | # pragma warning(disable:4786) |
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9 | #endif |
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10 | #include <cassert> |
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11 | #include <cstdlib> |
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12 | #include <cmath> |
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13 | #include <cfloat> |
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14 | |
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15 | #include "OsiSolverInterface.hpp" |
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16 | #include "OsiSolverBranch.hpp" |
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17 | #include "OsiChooseVariable.hpp" |
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18 | #include "CbcModel.hpp" |
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19 | #include "CbcMessage.hpp" |
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20 | #include "CbcBranchBase.hpp" |
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21 | |
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22 | |
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23 | // Default Constructor |
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24 | CbcObject::CbcObject() |
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25 | : OsiObject(), |
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26 | model_(NULL), |
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27 | id_(-1), |
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28 | position_(-1), |
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29 | preferredWay_(0) |
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30 | { |
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31 | } |
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32 | |
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33 | // Constructor from model |
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34 | CbcObject::CbcObject(CbcModel * model) |
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35 | : OsiObject(), |
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36 | model_(model), |
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37 | id_(-1), |
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38 | position_(-1), |
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39 | preferredWay_(0) |
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40 | { |
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41 | } |
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42 | |
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43 | |
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44 | // Destructor |
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45 | CbcObject::~CbcObject () |
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46 | { |
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47 | } |
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48 | |
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49 | // Copy constructor |
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50 | CbcObject::CbcObject ( const CbcObject & rhs) |
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51 | : OsiObject(rhs) |
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52 | { |
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53 | model_ = rhs.model_; |
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54 | id_ = rhs.id_; |
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55 | position_ = rhs.position_; |
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56 | preferredWay_ = rhs.preferredWay_; |
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57 | } |
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58 | |
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59 | // Assignment operator |
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60 | CbcObject & |
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61 | CbcObject::operator=( const CbcObject & rhs) |
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62 | { |
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63 | if (this != &rhs) { |
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64 | OsiObject::operator=(rhs); |
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65 | model_ = rhs.model_; |
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66 | id_ = rhs.id_; |
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67 | position_ = rhs.position_; |
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68 | preferredWay_ = rhs.preferredWay_; |
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69 | } |
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70 | return *this; |
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71 | } |
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72 | |
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73 | /* Returns floor and ceiling i.e. closest valid points |
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74 | */ |
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75 | void |
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76 | CbcObject::floorCeiling(double & floorValue, double & ceilingValue, double value, |
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77 | double tolerance) const |
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78 | { |
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79 | if (fabs(floor(value + 0.5) - value) > tolerance) { |
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80 | floorValue = floor(value); |
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81 | } else { |
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82 | floorValue = floor(value + 0.5); |
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83 | } |
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84 | ceilingValue = floorValue + 1.0; |
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85 | } |
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86 | /* For the variable(s) referenced by the object, |
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87 | look at the current solution and set bounds to match the solution. |
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88 | Returns measure of how much it had to move solution to make feasible |
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89 | */ |
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90 | double |
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91 | CbcObject::feasibleRegion(OsiSolverInterface * /*solver*/) const |
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92 | { |
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93 | //assert (solver==model_->solver()); |
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94 | CbcObject * fudge = const_cast<CbcObject *>(this); |
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95 | fudge->feasibleRegion(); |
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96 | return 0.0; |
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97 | } |
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98 | |
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99 | /* For the variable(s) referenced by the object, |
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100 | look at the current solution and set bounds to match the solution. |
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101 | Returns measure of how much it had to move solution to make feasible |
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102 | */ |
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103 | double |
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104 | CbcObject::feasibleRegion(OsiSolverInterface * /*solver*/, |
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105 | const OsiBranchingInformation * /*info*/) const |
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106 | { |
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107 | //assert (solver==model_->solver()); |
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108 | CbcObject * fudge = const_cast<CbcObject *>(this); |
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109 | fudge->feasibleRegion(); |
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110 | return 0.0; |
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111 | } |
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112 | /* Create a branching object and indicate which way to branch first. |
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113 | |
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114 | The branching object has to know how to create branches (fix |
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115 | variables, etc.) |
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116 | */ |
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117 | OsiBranchingObject * |
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118 | CbcObject::createOsiBranch(OsiSolverInterface * solver, |
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119 | const OsiBranchingInformation * info, |
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120 | int way) const |
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121 | { |
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122 | //assert (solver==model_->solver()); |
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123 | CbcObject * fudge = const_cast<CbcObject *>(this); |
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124 | return fudge->createBranch(solver, info, way); |
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125 | } |
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126 | /* Create an OsiSolverBranch object |
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127 | |
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128 | This returns NULL if branch not represented by bound changes |
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129 | */ |
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130 | OsiSolverBranch * |
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131 | CbcObject::solverBranch() const |
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132 | { |
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133 | return NULL; |
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134 | } |
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135 | /* Pass in information on branch just done and create CbcObjectUpdateData instance. |
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136 | If object does not need data then backward pointer will be NULL. |
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137 | Assumes can get information from solver */ |
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138 | CbcObjectUpdateData |
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139 | CbcObject::createUpdateInformation(const OsiSolverInterface * /*solver*/, |
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140 | const CbcNode * /*node*/, |
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141 | const CbcBranchingObject * /*branchingObject*/) |
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142 | { |
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143 | return CbcObjectUpdateData(); |
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144 | } |
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145 | |
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146 | // Default Constructor |
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147 | CbcBranchingObject::CbcBranchingObject() |
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148 | : OsiBranchingObject() |
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149 | { |
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150 | model_ = NULL; |
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151 | originalCbcObject_ = NULL; |
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152 | variable_ = -1; |
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153 | way_ = 0; |
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154 | } |
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155 | |
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156 | // Useful constructor |
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157 | CbcBranchingObject::CbcBranchingObject (CbcModel * model, int variable, int way , double value) |
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158 | : OsiBranchingObject(model->solver(), value) |
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159 | { |
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160 | model_ = model; |
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161 | originalCbcObject_ = NULL; |
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162 | variable_ = variable; |
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163 | way_ = way; |
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164 | } |
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165 | |
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166 | // Copy constructor |
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167 | CbcBranchingObject::CbcBranchingObject ( const CbcBranchingObject & rhs) |
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168 | : OsiBranchingObject(rhs) |
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169 | { |
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170 | model_ = rhs.model_; |
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171 | originalCbcObject_ = rhs.originalCbcObject_; |
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172 | variable_ = rhs.variable_; |
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173 | way_ = rhs.way_; |
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174 | value_ = rhs.value_; |
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175 | } |
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176 | |
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177 | // Assignment operator |
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178 | CbcBranchingObject & |
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179 | CbcBranchingObject::operator=( const CbcBranchingObject & rhs) |
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180 | { |
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181 | if (this != &rhs) { |
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182 | OsiBranchingObject::operator=(rhs); |
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183 | model_ = rhs.model_; |
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184 | originalCbcObject_ = rhs.originalCbcObject_; |
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185 | variable_ = rhs.variable_; |
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186 | way_ = rhs.way_; |
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187 | } |
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188 | return *this; |
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189 | } |
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190 | |
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191 | // Destructor |
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192 | CbcBranchingObject::~CbcBranchingObject () |
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193 | { |
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194 | } |
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195 | // Default Constructor |
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196 | CbcBranchDecision::CbcBranchDecision () |
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197 | : object_(NULL), model_(NULL), chooseMethod_(NULL) |
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198 | { |
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199 | } |
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200 | |
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201 | // Copy Constructor |
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202 | CbcBranchDecision::CbcBranchDecision (const CbcBranchDecision &rhs) |
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203 | : object_(NULL), model_(rhs.model_), chooseMethod_(NULL) |
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204 | { |
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205 | if (rhs.chooseMethod_) |
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206 | chooseMethod_ = rhs.chooseMethod_->clone(); |
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207 | } |
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208 | |
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209 | CbcBranchDecision::~CbcBranchDecision() |
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210 | { |
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211 | delete object_; |
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212 | delete chooseMethod_; |
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213 | } |
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214 | /* Compare N branching objects. Return index of best |
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215 | and sets way of branching in chosen object. |
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216 | |
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217 | This routine is used only after strong branching. |
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218 | This is reccommended version as it can be more sophisticated |
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219 | */ |
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220 | |
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221 | int |
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222 | CbcBranchDecision::bestBranch (CbcBranchingObject ** objects, int numberObjects, |
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223 | int /*numberUnsatisfied*/, |
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224 | double * changeUp, int * numberInfeasibilitiesUp, |
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225 | double * changeDown, int * numberInfeasibilitiesDown, |
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226 | double /*objectiveValue*/) |
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227 | { |
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228 | int bestWay = 0; |
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229 | int whichObject = -1; |
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230 | if (numberObjects) { |
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231 | initialize(objects[0]->model()); |
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232 | CbcBranchingObject * bestObject = NULL; |
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233 | for (int i = 0 ; i < numberObjects ; i++) { |
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234 | int betterWay = betterBranch(objects[i], |
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235 | bestObject, |
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236 | changeUp[i], |
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237 | numberInfeasibilitiesUp [i], |
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238 | changeDown[i], |
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239 | numberInfeasibilitiesDown[i] ); |
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240 | if (betterWay) { |
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241 | bestObject = objects[i]; |
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242 | bestWay = betterWay; |
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243 | whichObject = i; |
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244 | } |
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245 | } |
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246 | // set way in best |
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247 | if (whichObject >= 0) |
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248 | objects[whichObject]->way(bestWay); |
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249 | } |
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250 | return whichObject; |
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251 | } |
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252 | // Set (clone) chooseMethod |
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253 | void |
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254 | CbcBranchDecision::setChooseMethod(const OsiChooseVariable & method) |
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255 | { |
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256 | delete chooseMethod_; |
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257 | chooseMethod_ = method.clone(); |
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258 | } |
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259 | // Default constructor |
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260 | CbcConsequence::CbcConsequence() |
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261 | { |
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262 | } |
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263 | |
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264 | |
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265 | // Destructor |
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266 | CbcConsequence::~CbcConsequence () |
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267 | { |
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268 | } |
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269 | |
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270 | // Copy constructor |
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271 | CbcConsequence::CbcConsequence ( const CbcConsequence & /*rhs*/) |
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272 | { |
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273 | } |
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274 | |
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275 | // Assignment operator |
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276 | CbcConsequence & |
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277 | CbcConsequence::operator=( const CbcConsequence & rhs) |
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278 | { |
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279 | if (this != &rhs) { |
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280 | } |
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281 | return *this; |
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282 | } |
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283 | // Default constructor |
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284 | CbcObjectUpdateData::CbcObjectUpdateData() |
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285 | : object_(NULL), |
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286 | way_(0), |
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287 | objectNumber_(-1), |
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288 | change_(0.0), |
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289 | status_(0), |
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290 | intDecrease_(0), |
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291 | branchingValue_(0.0), |
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292 | originalObjective_(COIN_DBL_MAX), |
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293 | cutoff_(COIN_DBL_MAX) |
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294 | { |
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295 | } |
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296 | |
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297 | // Useful constructor |
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298 | CbcObjectUpdateData::CbcObjectUpdateData (CbcObject * object, |
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299 | int way, |
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300 | double change, |
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301 | int status, |
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302 | int intDecrease, |
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303 | double branchingValue) |
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304 | : object_(object), |
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305 | way_(way), |
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306 | objectNumber_(-1), |
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307 | change_(change), |
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308 | status_(status), |
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309 | intDecrease_(intDecrease), |
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310 | branchingValue_(branchingValue), |
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311 | originalObjective_(COIN_DBL_MAX), |
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312 | cutoff_(COIN_DBL_MAX) |
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313 | { |
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314 | } |
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315 | |
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316 | // Destructor |
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317 | CbcObjectUpdateData::~CbcObjectUpdateData () |
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318 | { |
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319 | } |
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320 | |
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321 | // Copy constructor |
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322 | CbcObjectUpdateData::CbcObjectUpdateData ( const CbcObjectUpdateData & rhs) |
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323 | : object_(rhs.object_), |
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324 | way_(rhs.way_), |
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325 | objectNumber_(rhs.objectNumber_), |
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326 | change_(rhs.change_), |
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327 | status_(rhs.status_), |
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328 | intDecrease_(rhs.intDecrease_), |
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329 | branchingValue_(rhs.branchingValue_), |
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330 | originalObjective_(rhs.originalObjective_), |
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331 | cutoff_(rhs.cutoff_) |
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332 | { |
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333 | } |
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334 | |
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335 | // Assignment operator |
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336 | CbcObjectUpdateData & |
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337 | CbcObjectUpdateData::operator=( const CbcObjectUpdateData & rhs) |
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338 | { |
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339 | if (this != &rhs) { |
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340 | object_ = rhs.object_; |
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341 | way_ = rhs.way_; |
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342 | objectNumber_ = rhs.objectNumber_; |
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343 | change_ = rhs.change_; |
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344 | status_ = rhs.status_; |
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345 | intDecrease_ = rhs.intDecrease_; |
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346 | branchingValue_ = rhs.branchingValue_; |
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347 | originalObjective_ = rhs.originalObjective_; |
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348 | cutoff_ = rhs.cutoff_; |
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349 | } |
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350 | return *this; |
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351 | } |
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352 | |
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353 | |
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