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<a href="linear__solver__callback_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2010-2021 Google LLC</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// You may obtain a copy of the License at</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">//</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// See the License for the specific language governing permissions and</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// limitations under the License.</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// See go/mpsolver-callbacks for documentation on how to use this file.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#ifndef OR_TOOLS_LINEAR_SOLVER_LINEAR_SOLVER_CALLBACK_H_</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#define OR_TOOLS_LINEAR_SOLVER_LINEAR_SOLVER_CALLBACK_H_</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <cstdint></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <string></span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <vector></span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "absl/container/flat_hash_map.h"</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "<a class="code" href="integral__types_8h.html">ortools/base/integral_types.h</a>"</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">namespace </span><a class="code" href="namespaceoperations__research.html">operations_research</a> {</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keyword">class </span>LinearExpr;</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">class </span>LinearRange;</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">class </span>MPVariable;</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// The current state of the solver when the callback is invoked.</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">//</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// For Gurobi, similar to the int 'where' in the Gurobi callback API.</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// See http://www.gurobi.com/documentation/8.0/refman/callback_codes.html</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// for details.</span></div><div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831"> 37</a></span> <span class="keyword">enum class</span> <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831">MPCallbackEvent</a> {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a25c2dc47991b3df171ed5192bcf70390">kUnknown</a>,</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="comment">// For regaining control of the main thread in single threaded applications,</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// not for interacting with the solver.</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a68ecbabf5f60cdbc5b8d5737fae095b5">kPolling</a>,</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// The solver is currently running presolve.</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831aac5d782c5d5407f4f333a40c2cc681ba">kPresolve</a>,</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="comment">// The solver is currently running the simplex method.</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831ae97d1190dcdbe357a2cf9498ce213335">kSimplex</a>,</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// The solver is in the MIP loop (called periodically before starting a new</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// node). Useful to early termination.</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a2cf6e729c26edab22a90defbd8af7d67">kMip</a>,</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// Called every time a new MIP incumbent is found.</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a744c240a000894a88cd9f4740db5b87f">kMipSolution</a>,</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// Called once per pass of the cut loop inside each MIP node.</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831af29c26bf194553ac39cae68e31d6175c">kMipNode</a>,</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// Called in each iterate of IPM/barrier method.</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831affa5976cb7170d234d6b69921bf0f085">kBarrier</a>,</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// The solver is about to log out a message, use this callback to capture it.</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a9b74dc5b6954a9e2ba62b24c1f8c01e0">kMessage</a>,</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// The solver is in multi-objective optimization.</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a181258232152ad012fb0f7430248eef2">kMultiObj</a>,</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> };</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> std::string <a class="code" href="namespaceoperations__research.html#a23fc0ff92a3f47fe0bd2ad3eac3c9b57">ToString</a>(<a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831">MPCallbackEvent</a> event);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// When querying solution values or modifying the model during a callback, use</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// this API, rather than manipulating MPSolver directly. You should only</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// interact with this object from within MPCallback::RunCallback().</span></div><div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_m_p_callback_context.html"> 66</a></span> <span class="keyword">class </span><a class="code" href="classoperations__research_1_1_m_p_callback_context.html">MPCallbackContext</a> {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00068"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_m_p_callback_context.html#acd15f7b9f561c710a6bfab60cdb2849a"> 68</a></span>  <span class="keyword">virtual</span> <a class="code" href="classoperations__research_1_1_m_p_callback_context.html#acd15f7b9f561c710a6bfab60cdb2849a">~MPCallbackContext</a>() {}</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">// What the solver is currently doing. How you can interact with the solver</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// from the callback depends on this value.</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">virtual</span> <a class="code" href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831">MPCallbackEvent</a> <a class="code" href="classoperations__research_1_1_m_p_callback_context.html#a114b177c99f427b6d0d6b1b379b5838a">Event</a>() = 0;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// Always false if event is not kMipSolution or kMipNode, otherwise behavior</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// may be solver dependent.</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">//</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// For Gurobi, under kMipNode, may be false if the node was not solved to</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">// optimality, see MIPNODE_REL here for details:</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="comment">// http://www.gurobi.com/documentation/8.0/refman/callback_codes.html</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code" href="classoperations__research_1_1_m_p_callback_context.html#acb9490649ae0b6ce2fd9b7d5ec79409e">CanQueryVariableValues</a>() = 0;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// Returns the value of variable from the solver's current state.</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">//</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">// Call only when CanQueryVariableValues() is true.</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="comment">//</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="comment">// At kMipSolution, the solution is integer feasible, while at kMipNode, the</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">// solution solves the current node's LP relaxation (so integer variables may</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">// be fractional).</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">virtual</span> <span class="keywordtype">double</span> <a class="code" href="classoperations__research_1_1_m_p_callback_context.html#a83fb66141e4b17ee11bfa9e04dc66563">VariableValue</a>(<span class="keyword">const</span> <a class="code" href="classoperations__research_1_1_m_p_variable.html">MPVariable</a>* variable) = 0;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// Adds a constraint to the model that strengths the LP relaxation.</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">//</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// Call only when the event is kMipNode.</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">//</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">// Requires that MPCallback::might_add_cuts() is true.</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">//</span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="comment">// This constraint must not cut off integer solutions, it should only</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// strengthen the LP (behavior is undefined otherwise). Use</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">// MPCallbackContext::AddLazyConstriant() if you are cutting off integer</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// solutions.</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_m_p_callback_context.html#aad0fd4b98cffeb1caa42d0bf3032607b">AddCut</a>(<span class="keyword">const</span> <a class="code" href="classoperations__research_1_1_linear_range.html">LinearRange</a>& cutting_plane) = 0;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// Adds a constraint to the model that cuts off an undesired integer solution.</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">//</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// Call only when the event is kMipSolution or kMipNode.</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">//</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="comment">// Requires that MPCallback::might_add_lazy_constraints() is true.</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">//</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// Use this to avoid adding a large number of constraints to the model where</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">// most are expected to not be needed.</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">//</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// Given an integral solution, AddLazyConstraint() MUST be able to detect if</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="comment">// there is a violated constraint, and it is guaranteed that every integer</span></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="comment">// solution will be checked by AddLazyConstraint().</span></div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">//</span></div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// Warning(rander): in some solvers, e.g. Gurobi, an integer solution may not</span></div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="comment">// respect a previously added lazy constraint, so you may need to add a</span></div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="comment">// constraint more than once (e.g. due to threading issues).</span></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_m_p_callback_context.html#aa1db5c0051875f7406a147aed7a13649">AddLazyConstraint</a>(<span class="keyword">const</span> <a class="code" href="classoperations__research_1_1_linear_range.html">LinearRange</a>& lazy_constraint) = 0;</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// Suggests a (potentially partial) variable assignment to the solver, to be</span></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// used as a feasible solution (or part of one). If the assignment is partial,</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">// certain solvers (e.g. Gurobi) will try to compute a feasible solution from</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// the partial assignment. Returns the objective value of the solution if the</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="comment">// solver supports it.</span></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="comment">//</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// Call only when the event is kMipNode.</span></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keyword">virtual</span> <span class="keywordtype">double</span> <a class="code" href="classoperations__research_1_1_m_p_callback_context.html#aef6f1a998a5e8be2a006cc8d0728975d">SuggestSolution</a>(</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keyword">const</span> absl::flat_hash_map<const MPVariable*, double>& solution) = 0;</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">// Returns the number of nodes explored so far in the branch and bound tree,</span></div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="comment">// which 0 at the root node and > 0 otherwise.</span></div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">//</span></div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// Call only when the event is kMipSolution or kMipNode.</span></div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">virtual</span> int64_t <a class="code" href="classoperations__research_1_1_m_p_callback_context.html#a44b21129261e8cdc93d44c39212ba1dd">NumExploredNodes</a>() = 0;</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> };</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment">// Extend this class with model specific logic, and register through</span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment">// MPSolver::SetCallback, passing a pointer to this object.</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment">//</span></div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment">// See go/mpsolver-callbacks for additional documentation.</span></div><div class="line"><a name="l00142"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_m_p_callback.html"> 142</a></span> <span class="keyword">class </span><a class="code" href="classoperations__research_1_1_m_p_callback.html">MPCallback</a> {</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="comment">// If you intend to call call MPCallbackContext::AddCut(), you must set</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">// might_add_cuts below to be true. Likewise for</span></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="comment">// MPCallbackContext::AddLazyConstraint() and might_add_lazy_constraints.</span></div><div class="line"><a name="l00147"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_m_p_callback.html#a6da3cbc1e9119318f3d44a6e4d49f02f"> 147</a></span>  <a class="code" href="classoperations__research_1_1_m_p_callback.html#a6da3cbc1e9119318f3d44a6e4d49f02f">MPCallback</a>(<span class="keywordtype">bool</span> <a class="code" href="classoperations__research_1_1_m_p_callback.html#a908b5e074d2670fb495f6e899efdf3d3">might_add_cuts</a>, <span class="keywordtype">bool</span> <a class="code" href="classoperations__research_1_1_m_p_callback.html#aba25bfa60f26f0275a683ce9ec618de3">might_add_lazy_constraints</a>)</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  : might_add_cuts_(<a class="code" href="classoperations__research_1_1_m_p_callback.html#a908b5e074d2670fb495f6e899efdf3d3">might_add_cuts</a>),</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  might_add_lazy_constraints_(<a class="code" href="classoperations__research_1_1_m_p_callback.html#aba25bfa60f26f0275a683ce9ec618de3">might_add_lazy_constraints</a>) {}</div><div class="line"><a name="l00150"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_m_p_callback.html#a519c91052e0070bc1097e35746025e37"> 150</a></span>  <span class="keyword">virtual</span> <a class="code" href="classoperations__research_1_1_m_p_callback.html#a519c91052e0070bc1097e35746025e37">~MPCallback</a>() {}</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">// Threading behavior may be solver dependent:</span></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">// * Gurobi: RunCallback always runs on the same thread that you called</span></div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="comment">// MPSolver::Solve() on, even when Gurobi uses multiple threads.</span></div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_m_p_callback.html#abddae1c9b6bfbbdbfc71179ecfff625e">RunCallback</a>(<a class="code" href="classoperations__research_1_1_m_p_callback_context.html">MPCallbackContext</a>* callback_context) = 0;</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div><div class="line"><a name="l00157"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_m_p_callback.html#a908b5e074d2670fb495f6e899efdf3d3"> 157</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classoperations__research_1_1_m_p_callback.html#a908b5e074d2670fb495f6e899efdf3d3">might_add_cuts</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> might_add_cuts_; }</div><div class="line"><a name="l00158"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_m_p_callback.html#aba25bfa60f26f0275a683ce9ec618de3"> 158</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classoperations__research_1_1_m_p_callback.html#aba25bfa60f26f0275a683ce9ec618de3">might_add_lazy_constraints</a>()<span class="keyword"> const </span>{</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">return</span> might_add_lazy_constraints_;</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  }</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordtype">bool</span> might_add_cuts_;</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordtype">bool</span> might_add_lazy_constraints_;</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span> };</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment">// Single callback that runs the list of callbacks given at construction, in</span></div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment">// sequence.</span></div><div class="line"><a name="l00169"></a><span class="lineno"><a class="line" href="classoperations__research_1_1_m_p_callback_list.html"> 169</a></span> <span class="keyword">class </span><a class="code" href="classoperations__research_1_1_m_p_callback_list.html">MPCallbackList</a> : <span class="keyword">public</span> <a class="code" href="classoperations__research_1_1_m_p_callback.html">MPCallback</a> {</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keyword">explicit</span> <a class="code" href="classoperations__research_1_1_m_p_callback_list.html#abb47cd17f712efd8141cc579d6b9649a">MPCallbackList</a>(<span class="keyword">const</span> std::vector<MPCallback*>& callbacks);</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span> </div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="comment">// Runs all callbacks from the list given at construction, in sequence.</span></div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1_m_p_callback_list.html#a0619d58e42c894eeb17561753709d495">RunCallback</a>(<a class="code" href="classoperations__research_1_1_m_p_callback_context.html">MPCallbackContext</a>* <a class="code" href="gurobi__interface_8cc.html#a5f287b83a753915ae862fed64f8640a6">context</a>) <span class="keyword">override</span>;</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keyword">const</span> std::vector<MPCallback*> callbacks_;</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span> };</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span> </div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> } <span class="comment">// namespace operations_research</span></div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="preprocessor">#endif // OR_TOOLS_LINEAR_SOLVER_LINEAR_SOLVER_CALLBACK_H_</span></div><div class="ttc" id="classoperations__research_1_1_m_p_callback_context_html_acb9490649ae0b6ce2fd9b7d5ec79409e"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_context.html#acb9490649ae0b6ce2fd9b7d5ec79409e">operations_research::MPCallbackContext::CanQueryVariableValues</a></div><div class="ttdeci">virtual bool CanQueryVariableValues()=0</div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831a181258232152ad012fb0f7430248eef2"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a181258232152ad012fb0f7430248eef2">operations_research::MPCallbackEvent::kMultiObj</a></div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831affa5976cb7170d234d6b69921bf0f085"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831affa5976cb7170d234d6b69921bf0f085">operations_research::MPCallbackEvent::kBarrier</a></div></div>
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<div class="ttc" id="namespaceoperations__research_html_a23fc0ff92a3f47fe0bd2ad3eac3c9b57"><div class="ttname"><a href="namespaceoperations__research.html#a23fc0ff92a3f47fe0bd2ad3eac3c9b57">operations_research::ToString</a></div><div class="ttdeci">const absl::string_view ToString(MPSolver::OptimizationProblemType optimization_problem_type)</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver_8cc_source.html#l00576">linear_solver.cc:576</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_list_html_abb47cd17f712efd8141cc579d6b9649a"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_list.html#abb47cd17f712efd8141cc579d6b9649a">operations_research::MPCallbackList::MPCallbackList</a></div><div class="ttdeci">MPCallbackList(const std::vector< MPCallback * > &callbacks)</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8cc_source.html#l00072">linear_solver_callback.cc:72</a></div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831aac5d782c5d5407f4f333a40c2cc681ba"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831aac5d782c5d5407f4f333a40c2cc681ba">operations_research::MPCallbackEvent::kPresolve</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_context_html_acd15f7b9f561c710a6bfab60cdb2849a"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_context.html#acd15f7b9f561c710a6bfab60cdb2849a">operations_research::MPCallbackContext::~MPCallbackContext</a></div><div class="ttdeci">virtual ~MPCallbackContext()</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8h_source.html#l00068">linear_solver_callback.h:68</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_context_html"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_context.html">operations_research::MPCallbackContext</a></div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8h_source.html#l00066">linear_solver_callback.h:66</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_list_html"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_list.html">operations_research::MPCallbackList</a></div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8h_source.html#l00169">linear_solver_callback.h:169</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_context_html_a44b21129261e8cdc93d44c39212ba1dd"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_context.html#a44b21129261e8cdc93d44c39212ba1dd">operations_research::MPCallbackContext::NumExploredNodes</a></div><div class="ttdeci">virtual int64_t NumExploredNodes()=0</div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_context_html_aa1db5c0051875f7406a147aed7a13649"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_context.html#aa1db5c0051875f7406a147aed7a13649">operations_research::MPCallbackContext::AddLazyConstraint</a></div><div class="ttdeci">virtual void AddLazyConstraint(const LinearRange &lazy_constraint)=0</div></div>
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<div class="ttc" id="integral__types_8h_html"><div class="ttname"><a href="integral__types_8h.html">integral_types.h</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_variable_html"><div class="ttname"><a href="classoperations__research_1_1_m_p_variable.html">operations_research::MPVariable</a></div><div class="ttdoc">The class for variables of a Mathematical Programming (MP) model.</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver_8h_source.html#l01087">linear_solver.h:1087</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_html_a519c91052e0070bc1097e35746025e37"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback.html#a519c91052e0070bc1097e35746025e37">operations_research::MPCallback::~MPCallback</a></div><div class="ttdeci">virtual ~MPCallback()</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8h_source.html#l00150">linear_solver_callback.h:150</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_list_html_a0619d58e42c894eeb17561753709d495"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_list.html#a0619d58e42c894eeb17561753709d495">operations_research::MPCallbackList::RunCallback</a></div><div class="ttdeci">void RunCallback(MPCallbackContext *context) override</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8cc_source.html#l00077">linear_solver_callback.cc:77</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_context_html_a83fb66141e4b17ee11bfa9e04dc66563"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_context.html#a83fb66141e4b17ee11bfa9e04dc66563">operations_research::MPCallbackContext::VariableValue</a></div><div class="ttdeci">virtual double VariableValue(const MPVariable *variable)=0</div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_html_abddae1c9b6bfbbdbfc71179ecfff625e"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback.html#abddae1c9b6bfbbdbfc71179ecfff625e">operations_research::MPCallback::RunCallback</a></div><div class="ttdeci">virtual void RunCallback(MPCallbackContext *callback_context)=0</div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831ae97d1190dcdbe357a2cf9498ce213335"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831ae97d1190dcdbe357a2cf9498ce213335">operations_research::MPCallbackEvent::kSimplex</a></div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831a68ecbabf5f60cdbc5b8d5737fae095b5"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a68ecbabf5f60cdbc5b8d5737fae095b5">operations_research::MPCallbackEvent::kPolling</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_html_a6da3cbc1e9119318f3d44a6e4d49f02f"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback.html#a6da3cbc1e9119318f3d44a6e4d49f02f">operations_research::MPCallback::MPCallback</a></div><div class="ttdeci">MPCallback(bool might_add_cuts, bool might_add_lazy_constraints)</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8h_source.html#l00147">linear_solver_callback.h:147</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_context_html_aef6f1a998a5e8be2a006cc8d0728975d"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_context.html#aef6f1a998a5e8be2a006cc8d0728975d">operations_research::MPCallbackContext::SuggestSolution</a></div><div class="ttdeci">virtual double SuggestSolution(const absl::flat_hash_map< const MPVariable *, double > &solution)=0</div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_context_html_aad0fd4b98cffeb1caa42d0bf3032607b"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_context.html#aad0fd4b98cffeb1caa42d0bf3032607b">operations_research::MPCallbackContext::AddCut</a></div><div class="ttdeci">virtual void AddCut(const LinearRange &cutting_plane)=0</div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831af29c26bf194553ac39cae68e31d6175c"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831af29c26bf194553ac39cae68e31d6175c">operations_research::MPCallbackEvent::kMipNode</a></div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831a2cf6e729c26edab22a90defbd8af7d67"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a2cf6e729c26edab22a90defbd8af7d67">operations_research::MPCallbackEvent::kMip</a></div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831a9b74dc5b6954a9e2ba62b24c1f8c01e0"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a9b74dc5b6954a9e2ba62b24c1f8c01e0">operations_research::MPCallbackEvent::kMessage</a></div></div>
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<div class="ttc" id="namespaceoperations__research_html"><div class="ttname"><a href="namespaceoperations__research.html">operations_research</a></div><div class="ttdoc">Collection of objects used to extend the Constraint Solver library.</div><div class="ttdef"><b>Definition:</b> <a href="dense__doubly__linked__list_8h_source.html#l00021">dense_doubly_linked_list.h:21</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_html"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback.html">operations_research::MPCallback</a></div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8h_source.html#l00142">linear_solver_callback.h:142</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_html_a908b5e074d2670fb495f6e899efdf3d3"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback.html#a908b5e074d2670fb495f6e899efdf3d3">operations_research::MPCallback::might_add_cuts</a></div><div class="ttdeci">bool might_add_cuts() const</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8h_source.html#l00157">linear_solver_callback.h:157</a></div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831a25c2dc47991b3df171ed5192bcf70390"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a25c2dc47991b3df171ed5192bcf70390">operations_research::MPCallbackEvent::kUnknown</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_linear_range_html"><div class="ttname"><a href="classoperations__research_1_1_linear_range.html">operations_research::LinearRange</a></div><div class="ttdoc">An expression of the form:</div><div class="ttdef"><b>Definition:</b> <a href="linear__expr_8h_source.html#l00192">linear_expr.h:192</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_context_html_a114b177c99f427b6d0d6b1b379b5838a"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback_context.html#a114b177c99f427b6d0d6b1b379b5838a">operations_research::MPCallbackContext::Event</a></div><div class="ttdeci">virtual MPCallbackEvent Event()=0</div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831a744c240a000894a88cd9f4740db5b87f"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831a744c240a000894a88cd9f4740db5b87f">operations_research::MPCallbackEvent::kMipSolution</a></div></div>
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<div class="ttc" id="classoperations__research_1_1_m_p_callback_html_aba25bfa60f26f0275a683ce9ec618de3"><div class="ttname"><a href="classoperations__research_1_1_m_p_callback.html#aba25bfa60f26f0275a683ce9ec618de3">operations_research::MPCallback::might_add_lazy_constraints</a></div><div class="ttdeci">bool might_add_lazy_constraints() const</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8h_source.html#l00158">linear_solver_callback.h:158</a></div></div>
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<div class="ttc" id="gurobi__interface_8cc_html_a5f287b83a753915ae862fed64f8640a6"><div class="ttname"><a href="gurobi__interface_8cc.html#a5f287b83a753915ae862fed64f8640a6">context</a></div><div class="ttdeci">GurobiMPCallbackContext * context</div><div class="ttdef"><b>Definition:</b> <a href="gurobi__interface_8cc_source.html#l00514">gurobi_interface.cc:514</a></div></div>
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<div class="ttc" id="namespaceoperations__research_html_a4f0b2adea9a4297f27df941fe3ed3831"><div class="ttname"><a href="namespaceoperations__research.html#a4f0b2adea9a4297f27df941fe3ed3831">operations_research::MPCallbackEvent</a></div><div class="ttdeci">MPCallbackEvent</div><div class="ttdef"><b>Definition:</b> <a href="linear__solver__callback_8h_source.html#l00037">linear_solver_callback.h:37</a></div></div>
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