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<a href="solve_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// Copyright 2010-2021 Google LLC</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div>
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<div class="line"><a id="l00003" 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>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment">// You may obtain a copy of the License at</span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment">//</span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">//</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment">// See the License for the specific language governing permissions and</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment">// limitations under the License.</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment">// Functions and classes used to solve a Model.</span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment">//</span></div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment">// The main entry point is the Solve() function.</span></div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment">//</span></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment">// For users that need incremental solving, there is the IncrementalSolver</span></div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment">// class.</span></div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#ifndef OR_TOOLS_MATH_OPT_CPP_SOLVE_H_</span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#define OR_TOOLS_MATH_OPT_CPP_SOLVE_H_</span></div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="preprocessor">#include <memory></span></div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include <optional></span></div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#include <utility></span></div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="preprocessor">#include "absl/status/statusor.h"</span></div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#include "<a class="code" href="model__storage_8h.html">ortools/math_opt/core/model_storage.h</a>"</span></div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#include "<a class="code" href="solver_8h.html">ortools/math_opt/core/solver.h</a>"</span></div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#include "<a class="code" href="math__opt_2cpp_2model_8h.html">ortools/math_opt/cpp/model.h</a>"</span></div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include "<a class="code" href="parameters_8h.html">ortools/math_opt/cpp/parameters.h</a>"</span> <span class="comment">// IWYU pragma: export</span></div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="preprocessor">#include "<a class="code" href="solve__arguments_8h.html">ortools/math_opt/cpp/solve_arguments.h</a>"</span> <span class="comment">// IWYU pragma: export</span></div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="preprocessor">#include "<a class="code" href="solve__result_8h.html">ortools/math_opt/cpp/solve_result.h</a>"</span> <span class="comment">// IWYU pragma: export</span></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="preprocessor">#include "<a class="code" href="solver__init__arguments_8h.html">ortools/math_opt/cpp/solver_init_arguments.h</a>"</span> <span class="comment">// IWYU pragma: export</span></div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="preprocessor">#include "ortools/math_opt/parameters.pb.h"</span> <span class="comment">// IWYU pragma: export</span></div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceoperations__research.html">operations_research</a> {</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceoperations__research_1_1math__opt.html">math_opt</a> {</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="comment">// Solves the input model.</span></div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment">//</span></div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment">// A Status error will be returned if there is an unexpected failure in an</span></div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment">// underlying solver or for some internal math_opt errors. Otherwise, check</span></div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="comment">// SolveResult::termination.reason to see if an optimal solution was found.</span></div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="comment">//</span></div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="comment">// Memory model: the returned SolveResult owns its own memory (for solutions,</span></div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="comment">// solve stats, etc.), EXPECT for a pointer back to the model. As a result:</span></div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="comment">// * Keep the model alive to access SolveResult,</span></div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="comment">// * Avoid unnecessarily copying SolveResult,</span></div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span><span class="comment">// * The result is generally accessible after mutating the model, but some care</span></div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="comment">// is needed if variables or linear constraints are added or deleted.</span></div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="comment">//</span></div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="comment">// Asserts (using CHECK) that the inputs solve_args.model_parameters and</span></div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="comment">// solve_args.callback_registration only contain variables and constraints from</span></div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="comment">// the input model.</span></div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="comment">//</span></div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><span class="comment">// Thread-safety: this method is safe to call concurrently on the same Model.</span></div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="comment">//</span></div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span><span class="comment">// Some solvers may add more restrictions regarding threading. Please see</span></div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="comment">// SolverType::kXxx documentation for details.</span></div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span>absl::StatusOr<SolveResult> <a class="code hl_function" href="namespaceoperations__research_1_1math__opt.html#a5767ee23f380e72488d3c7ebf2d742b1">Solve</a>(<span class="keyword">const</span> Model& <a class="code hl_variable" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>, <a class="code hl_enumeration" href="namespaceoperations__research_1_1math__opt.html#a8b06041d7c1fb05f379714f4312306ec">SolverType</a> solver_type,</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keyword">const</span> SolveArguments& solve_args = {},</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="keyword">const</span> SolverInitArguments& init_args = {});</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> </div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="comment">// Incremental solve of a model.</span></div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="comment">//</span></div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span><span class="comment">// This is a feature for advance users. Most users should only use the Solve()</span></div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span><span class="comment">// function above.</span></div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span><span class="comment">//</span></div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="comment">// Here incremental means that the we try to reuse the existing underlying</span></div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span><span class="comment">// solver internals between each solve. There is no guarantee though that the</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span><span class="comment">// solver supports all possible model changes. Hence there is not guarantee that</span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="comment">// performances will be improved when using this class; this is solver</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="comment">// dependent. Typically LPs have more to gain from incremental solve than</span></div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="comment">// MIPs. In both cases, even if the solver supports the model changes,</span></div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="comment">// incremental solve may actually be slower.</span></div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span><span class="comment">//</span></div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span><span class="comment">// The New() function instantiates the solver, setup it from the current state</span></div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="comment">// of the Model and register on it to listen to changes. Calling Solve() will</span></div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="comment">// update the underlying solver with latest model changes and solve this model.</span></div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span><span class="comment">//</span></div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span><span class="comment">// Usage:</span></div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span><span class="comment">// Model model = ...;</span></div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span><span class="comment">// ASSIGN_OR_RETURN(</span></div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span><span class="comment">// const std::unique_ptr<IncrementalSolver> incremental_solve,</span></div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span><span class="comment">// IncrementalSolver::New(&model, SolverType::kXxx));</span></div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span><span class="comment">//</span></div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span><span class="comment">// ASSIGN_OR_RETURN(const SolveResult result1, incremental_solve->Solve());</span></div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span><span class="comment">//</span></div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span><span class="comment">// model.AddVariable(...);</span></div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span><span class="comment">// ...</span></div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="comment">//</span></div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><span class="comment">// ASSIGN_OR_RETURN(const SolveResult result2, incremental_solve->Solve());</span></div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span><span class="comment">//</span></div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span><span class="comment">// ...</span></div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span><span class="comment">//</span></div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span><span class="comment">// Lifecycle: The IncrementalSolver is only keeping a std::weak_ref on Model's</span></div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span><span class="comment">// internal data and thus it returns an error if Update() or Solve() are called</span></div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span><span class="comment">// after the Model has been destroyed. It is fine to destroy the</span></div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span><span class="comment">// IncrementalSolver after the associated Model though.</span></div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span><span class="comment">//</span></div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span><span class="comment">// Thread-safety: The New(), Solve() and Update() methods must not be called</span></div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span><span class="comment">// while modifying the Model() (adding variables...). The user is expected to</span></div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span><span class="comment">// use proper synchronization primitives to serialize changes to the model and</span></div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span><span class="comment">// the use of this object. Note though that it is safe to call methods from</span></div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span><span class="comment">// different IncrementalSolver instances on the same Model concurrently.</span></div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span><span class="comment">//</span></div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span><span class="comment">// There is no problem calling SolveWithoutUpdate() concurrently on different</span></div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span><span class="comment">// instances of IncrementalSolver or while the model is being modified (unless</span></div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span><span class="comment">// of course the underlying solver itself is not thread-safe and can only be</span></div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span><span class="comment">// called from a single-thread).</span></div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span><span class="comment">//</span></div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><span class="comment">// Note that Solve(), Update() and SolveWithoutUpdate() are not reentrant so</span></div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span><span class="comment">// they should not be called concurrently on the same instance of</span></div>
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span><span class="comment">// IncrementalSolver.</span></div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span><span class="comment">//</span></div>
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<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span><span class="comment">// Some solvers may add more restrictions regarding threading. Please see</span></div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span><span class="comment">// SolverType::kXxx documentation for details.</span></div>
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"><a class="line" href="classoperations__research_1_1math__opt_1_1_incremental_solver.html"> 119</a></span><span class="keyword">class </span><a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_incremental_solver.html">IncrementalSolver</a> {</div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> <span class="keyword">public</span>:</div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"><a class="line" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html"> 121</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html">UpdateResult</a> {</div>
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<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"><a class="line" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#aca60964d8edb7692ec22cac7575a2309"> 122</a></span> <a class="code hl_function" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#aca60964d8edb7692ec22cac7575a2309">UpdateResult</a>(<span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code hl_variable" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#abbb69ae0e3fd45152c94cff90ca8b05f">did_update</a>, std::optional<ModelUpdateProto> <a class="code hl_variable" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#ab53ed1375e845374b0463cb03dafa53e">update</a>)</div>
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<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> : <a class="code hl_variable" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#abbb69ae0e3fd45152c94cff90ca8b05f">did_update</a>(<a class="code hl_variable" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#abbb69ae0e3fd45152c94cff90ca8b05f">did_update</a>), <a class="code hl_variable" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#ab53ed1375e845374b0463cb03dafa53e">update</a>(<a class="code hl_namespace" href="namespacestd.html">std</a>::move(<a class="code hl_variable" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#ab53ed1375e845374b0463cb03dafa53e">update</a>)) {}</div>
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<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> </div>
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<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> <span class="comment">// True if the solver has been successfully updated or if no update was</span></div>
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<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> <span class="comment">// necessary (in which case `update` will be nullopt). False if the solver</span></div>
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<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> <span class="comment">// had to be recreated.</span></div>
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<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"><a class="line" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#abbb69ae0e3fd45152c94cff90ca8b05f"> 128</a></span> <span class="keywordtype">bool</span> <a class="code hl_variable" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#abbb69ae0e3fd45152c94cff90ca8b05f">did_update</a>;</div>
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<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> </div>
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<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="comment">// The update that was attempted on the solver. Can be nullopt when no</span></div>
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<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> <span class="comment">// update was needed (the model was not changed).</span></div>
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<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"><a class="line" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#ab53ed1375e845374b0463cb03dafa53e"> 132</a></span> std::optional<ModelUpdateProto> <a class="code hl_variable" href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#ab53ed1375e845374b0463cb03dafa53e">update</a>;</div>
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<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> };</div>
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<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> </div>
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<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="comment">// Creates a new incremental solve for the given model. It may returns an</span></div>
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<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> <span class="comment">// error if the parameters are invalid (for example if the selected solver is</span></div>
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<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> <span class="comment">// not linked in the binary).</span></div>
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<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> <span class="comment">// The returned IncrementalSolver keeps a copy of `arguments`. Thus the</span></div>
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<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> <span class="comment">// content of arguments.non_streamable (for example pointers to solver</span></div>
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<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> <span class="comment">// specific struct) must be valid until the destruction of the</span></div>
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<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <span class="comment">// IncrementalSolver. It also registers on the Model to keep track of updates</span></div>
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<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> <span class="comment">// (see class documentation for details).</span></div>
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<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> <span class="keyword">static</span> absl::StatusOr<std::unique_ptr<IncrementalSolver>> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_incremental_solver.html#ae216d134c8146dadaa9c16ef2ed1f7c4">New</a>(</div>
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<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> <a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_model.html">Model</a>* <a class="code hl_variable" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>, <a class="code hl_enumeration" href="namespaceoperations__research_1_1math__opt.html#a8b06041d7c1fb05f379714f4312306ec">SolverType</a> solver_type, <a class="code hl_struct" href="structoperations__research_1_1math__opt_1_1_solver_init_arguments.html">SolverInitArguments</a> arguments = {});</div>
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<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> </div>
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<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> <span class="comment">// Updates the underlying solver with latest model changes and runs the solve.</span></div>
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<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> <span class="comment">// A Status error will be returned if there is an unexpected failure in an</span></div>
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<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> <span class="comment">// underlying solver or for some internal math_opt errors. Otherwise, check</span></div>
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<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> <span class="comment">// SolveResult::termination.reason to see if an optimal solution was found.</span></div>
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<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> <span class="comment">// Memory model: the returned SolveResult owns its own memory (for solutions,</span></div>
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<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> <span class="comment">// solve stats, etc.), EXPECT for a pointer back to the model. As a result:</span></div>
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<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> <span class="comment">// * Keep the model alive to access SolveResult,</span></div>
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<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="comment">// * Avoid unnecessarily copying SolveResult,</span></div>
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<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> <span class="comment">// * The result is generally accessible after mutating this, but some care</span></div>
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<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> <span class="comment">// is needed if variables or linear constraints are added or deleted.</span></div>
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<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> <span class="comment">// Asserts (using CHECK) that the inputs arguments.model_parameters and</span></div>
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<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> <span class="comment">// arguments.callback_registration only contain variables and constraints from</span></div>
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<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> <span class="comment">// the input model.</span></div>
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<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> <span class="comment">// See callback.h for documentation on arguments.callback and</span></div>
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<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> <span class="comment">// arguments.callback_registration.</span></div>
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<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> absl::StatusOr<SolveResult> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_incremental_solver.html#a09edb28db4787bb2ab7f784443cf5d49">Solve</a>(<span class="keyword">const</span> <a class="code hl_struct" href="structoperations__research_1_1math__opt_1_1_solve_arguments.html">SolveArguments</a>& arguments = {});</div>
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<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> </div>
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<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> <span class="comment">// Updates the model to solve.</span></div>
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<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> <span class="comment">// This is an advanced API, most users should use Solve() above that does the</span></div>
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<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> <span class="comment">// update and before calling the solver. Calling this function is only useful</span></div>
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<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> <span class="comment">// for users that want to access to update data or users that need to use</span></div>
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<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> <span class="comment">// SolveWithoutUpdate() (which should not be common).</span></div>
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<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> <span class="comment">// The returned value indicates if the update was possible or if the solver</span></div>
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<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> <span class="comment">// had to be recreated from scratch (which may happen when the solver does not</span></div>
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<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> <span class="comment">// support this specific update or any update at all). It also contains the</span></div>
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<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> <span class="comment">// attempted update data.</span></div>
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<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> <span class="comment">// A status error will be returned if the underlying solver has an internal</span></div>
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<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> <span class="comment">// error.</span></div>
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<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> absl::StatusOr<UpdateResult> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_incremental_solver.html#a0e4c8a75b3b5cff81a7b59d710f81c92">Update</a>();</div>
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<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> </div>
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<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> <span class="comment">// Same as Solve() but does not update the underlying solver with the latest</span></div>
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<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> <span class="comment">// changes to the model.</span></div>
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<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> <span class="comment">// This is an advanced API, most users should use Solve().</span></div>
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<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> absl::StatusOr<SolveResult> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_incremental_solver.html#aafad5fca2fdbc339c7ff5a76d9211eaf">SolveWithoutUpdate</a>(</div>
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<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> <span class="keyword">const</span> SolveArguments& arguments = {}) <span class="keyword">const</span>;</div>
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<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> </div>
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<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> <span class="keyword">private</span>:</div>
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<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> IncrementalSolver(<a class="code hl_enumeration" href="namespaceoperations__research_1_1math__opt.html#a8b06041d7c1fb05f379714f4312306ec">SolverType</a> solver_type, SolverInitArguments init_args,</div>
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<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> <span class="keyword">const</span> ModelStorage* expected_storage,</div>
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<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> std::unique_ptr<UpdateTracker> update_tracker,</div>
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<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> std::unique_ptr<Solver> solver);</div>
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<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> </div>
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<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> <span class="keyword">const</span> <a class="code hl_enumeration" href="namespaceoperations__research_1_1math__opt.html#a8b06041d7c1fb05f379714f4312306ec">SolverType</a> solver_type_;</div>
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<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> <span class="keyword">const</span> SolverInitArguments init_args_;</div>
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<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span> <span class="keyword">const</span> ModelStorage* <span class="keyword">const</span> expected_storage_;</div>
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<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> <span class="keyword">const</span> std::unique_ptr<UpdateTracker> update_tracker_;</div>
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<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span> std::unique_ptr<Solver> solver_;</div>
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<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span>};</div>
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<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span> </div>
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<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span>} <span class="comment">// namespace math_opt</span></div>
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<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span>} <span class="comment">// namespace operations_research</span></div>
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<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> </div>
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<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span><span class="preprocessor">#endif </span><span class="comment">// OR_TOOLS_MATH_OPT_CPP_SOLVE_H_</span></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_incremental_solver_html"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_incremental_solver.html">operations_research::math_opt::IncrementalSolver</a></div><div class="ttdef"><b>Definition:</b> <a href="solve_8h_source.html#l00119">solve.h:119</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_incremental_solver_html_a09edb28db4787bb2ab7f784443cf5d49"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_incremental_solver.html#a09edb28db4787bb2ab7f784443cf5d49">operations_research::math_opt::IncrementalSolver::Solve</a></div><div class="ttdeci">absl::StatusOr< SolveResult > Solve(const SolveArguments &arguments={})</div><div class="ttdef"><b>Definition:</b> <a href="solve_8cc_source.html#l00131">solve.cc:131</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_incremental_solver_html_a0e4c8a75b3b5cff81a7b59d710f81c92"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_incremental_solver.html#a0e4c8a75b3b5cff81a7b59d710f81c92">operations_research::math_opt::IncrementalSolver::Update</a></div><div class="ttdeci">absl::StatusOr< UpdateResult > Update()</div><div class="ttdef"><b>Definition:</b> <a href="solve_8cc_source.html#l00137">solve.cc:137</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_incremental_solver_html_aafad5fca2fdbc339c7ff5a76d9211eaf"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_incremental_solver.html#aafad5fca2fdbc339c7ff5a76d9211eaf">operations_research::math_opt::IncrementalSolver::SolveWithoutUpdate</a></div><div class="ttdeci">absl::StatusOr< SolveResult > SolveWithoutUpdate(const SolveArguments &arguments={}) const</div><div class="ttdef"><b>Definition:</b> <a href="solve_8cc_source.html#l00159">solve.cc:159</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_incremental_solver_html_ae216d134c8146dadaa9c16ef2ed1f7c4"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_incremental_solver.html#ae216d134c8146dadaa9c16ef2ed1f7c4">operations_research::math_opt::IncrementalSolver::New</a></div><div class="ttdeci">static absl::StatusOr< std::unique_ptr< IncrementalSolver > > New(Model *model, SolverType solver_type, SolverInitArguments arguments={})</div><div class="ttdef"><b>Definition:</b> <a href="solve_8cc_source.html#l00104">solve.cc:104</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_model_html"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_model.html">operations_research::math_opt::Model</a></div><div class="ttdef"><b>Definition:</b> <a href="math__opt_2cpp_2model_8h_source.html#l00091">math_opt/cpp/model.h:91</a></div></div>
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<div class="ttc" id="agurobi__interface_8cc_html_a0728f23c9a47655d38e0bf1a2f200bcf"><div class="ttname"><a href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a></div><div class="ttdeci">GRBmodel * model</div><div class="ttdef"><b>Definition:</b> <a href="gurobi__interface_8cc_source.html#l00274">gurobi_interface.cc:274</a></div></div>
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<div class="ttc" id="amath__opt_2cpp_2model_8h_html"><div class="ttname"><a href="math__opt_2cpp_2model_8h.html">model.h</a></div></div>
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<div class="ttc" id="amodel__storage_8h_html"><div class="ttname"><a href="model__storage_8h.html">model_storage.h</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_1_1math__opt_html"><div class="ttname"><a href="namespaceoperations__research_1_1math__opt.html">operations_research::math_opt</a></div><div class="ttdef"><b>Definition:</b> <a href="arrow__operator__proxy_8h_source.html#l00020">arrow_operator_proxy.h:20</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_1_1math__opt_html_a5767ee23f380e72488d3c7ebf2d742b1"><div class="ttname"><a href="namespaceoperations__research_1_1math__opt.html#a5767ee23f380e72488d3c7ebf2d742b1">operations_research::math_opt::Solve</a></div><div class="ttdeci">absl::StatusOr< SolveResult > Solve(const Model &model, const SolverType solver_type, const SolveArguments &solve_args, const SolverInitArguments &init_args)</div><div class="ttdef"><b>Definition:</b> <a href="solve_8cc_source.html#l00094">solve.cc:94</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_1_1math__opt_html_a8b06041d7c1fb05f379714f4312306ec"><div class="ttname"><a href="namespaceoperations__research_1_1math__opt.html#a8b06041d7c1fb05f379714f4312306ec">operations_research::math_opt::SolverType</a></div><div class="ttdeci">SolverType</div><div class="ttdef"><b>Definition:</b> <a href="parameters_8h_source.html#l00037">parameters.h:37</a></div></div>
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<div class="ttc" id="anamespaceoperations__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="anamespacestd_html"><div class="ttname"><a href="namespacestd.html">std</a></div><div class="ttdoc">STL namespace.</div></div>
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<div class="ttc" id="aparameters_8h_html"><div class="ttname"><a href="parameters_8h.html">parameters.h</a></div></div>
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<div class="ttc" id="asolve__arguments_8h_html"><div class="ttname"><a href="solve__arguments_8h.html">solve_arguments.h</a></div></div>
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<div class="ttc" id="asolve__result_8h_html"><div class="ttname"><a href="solve__result_8h.html">solve_result.h</a></div></div>
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<div class="ttc" id="asolver_8h_html"><div class="ttname"><a href="solver_8h.html">solver.h</a></div></div>
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<div class="ttc" id="asolver__init__arguments_8h_html"><div class="ttname"><a href="solver__init__arguments_8h.html">solver_init_arguments.h</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result_html"><div class="ttname"><a href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html">operations_research::math_opt::IncrementalSolver::UpdateResult</a></div><div class="ttdef"><b>Definition:</b> <a href="solve_8h_source.html#l00121">solve.h:121</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result_html_ab53ed1375e845374b0463cb03dafa53e"><div class="ttname"><a href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#ab53ed1375e845374b0463cb03dafa53e">operations_research::math_opt::IncrementalSolver::UpdateResult::update</a></div><div class="ttdeci">std::optional< ModelUpdateProto > update</div><div class="ttdef"><b>Definition:</b> <a href="solve_8h_source.html#l00132">solve.h:132</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result_html_abbb69ae0e3fd45152c94cff90ca8b05f"><div class="ttname"><a href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#abbb69ae0e3fd45152c94cff90ca8b05f">operations_research::math_opt::IncrementalSolver::UpdateResult::did_update</a></div><div class="ttdeci">bool did_update</div><div class="ttdef"><b>Definition:</b> <a href="solve_8h_source.html#l00128">solve.h:128</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result_html_aca60964d8edb7692ec22cac7575a2309"><div class="ttname"><a href="structoperations__research_1_1math__opt_1_1_incremental_solver_1_1_update_result.html#aca60964d8edb7692ec22cac7575a2309">operations_research::math_opt::IncrementalSolver::UpdateResult::UpdateResult</a></div><div class="ttdeci">UpdateResult(const bool did_update, std::optional< ModelUpdateProto > update)</div><div class="ttdef"><b>Definition:</b> <a href="solve_8h_source.html#l00122">solve.h:122</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1math__opt_1_1_solve_arguments_html"><div class="ttname"><a href="structoperations__research_1_1math__opt_1_1_solve_arguments.html">operations_research::math_opt::SolveArguments</a></div><div class="ttdef"><b>Definition:</b> <a href="solve__arguments_8h_source.html#l00027">solve_arguments.h:27</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1math__opt_1_1_solver_init_arguments_html"><div class="ttname"><a href="structoperations__research_1_1math__opt_1_1_solver_init_arguments.html">operations_research::math_opt::SolverInitArguments</a></div><div class="ttdef"><b>Definition:</b> <a href="solver__init__arguments_8h_source.html#l00053">solver_init_arguments.h:53</a></div></div>
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