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<div class="headertitle"><div class="title">glpk_solver.h</div></div>
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<a href="glpk__solver_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="preprocessor">#ifndef OR_TOOLS_MATH_OPT_SOLVERS_GLPK_SOLVER_H_</span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="preprocessor">#define OR_TOOLS_MATH_OPT_SOLVERS_GLPK_SOLVER_H_</span></div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include <cstdint></span></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#include <memory></span></div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include <optional></span></div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#include <vector></span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#include "absl/container/flat_hash_map.h"</span></div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="preprocessor">#include "absl/status/status.h"</span></div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include "absl/status/statusor.h"</span></div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#include "<a class="code" href="base_2logging_8h.html">ortools/base/logging.h</a>"</span></div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="preprocessor">#include "ortools/math_opt/callback.pb.h"</span></div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="preprocessor">#include "<a class="code" href="solve__interrupter_8h.html">ortools/math_opt/core/solve_interrupter.h</a>"</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="solver__interface_8h.html">ortools/math_opt/core/solver_interface.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 "ortools/math_opt/model.pb.h"</span></div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#include "ortools/math_opt/model_parameters.pb.h"</span></div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include "ortools/math_opt/model_update.pb.h"</span></div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="preprocessor">#include "ortools/math_opt/parameters.pb.h"</span></div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="preprocessor">#include "ortools/math_opt/result.pb.h"</span></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="preprocessor">#include <glpk.h></span></div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span>}</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> </div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</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="l00040" name="l00040"></a><span class="lineno"> 40</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="l00041" name="l00041"></a><span class="lineno"> 41</span> </div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"><a class="line" href="classoperations__research_1_1math__opt_1_1_glpk_solver.html"> 42</a></span><span class="keyword">class </span><a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_glpk_solver.html">GlpkSolver</a> : <span class="keyword">public</span> <a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_solver_interface.html">SolverInterface</a> {</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">public</span>:</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keyword">static</span> absl::StatusOr<std::unique_ptr<SolverInterface>> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a61ac0bc6afed786de631c4a91faeb866">New</a>(</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keyword">const</span> ModelProto& <a class="code hl_variable" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>, <span class="keyword">const</span> <a class="code hl_struct" href="structoperations__research_1_1math__opt_1_1_solver_interface_1_1_init_args.html">InitArgs</a>& init_args);</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a76b75fc352b0c95032a58aa7600a47f4">~GlpkSolver</a>() <span class="keyword">override</span>;</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> </div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> absl::StatusOr<SolveResultProto> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a7875bc8ab28e1cf6cefc688d7b70ac7e">Solve</a>(</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keyword">const</span> SolveParametersProto& <a class="code hl_variable" href="cp__model__fz__solver_8cc.html#a10a1eab179b472c030bdc2a2efef7219">parameters</a>,</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">const</span> ModelSolveParametersProto& model_parameters,</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <a class="code hl_typedef" href="classoperations__research_1_1math__opt_1_1_solver_interface.html#aad3360b1947c772bebf3d3cfb2105a15">MessageCallback</a> message_cb,</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="keyword">const</span> CallbackRegistrationProto& callback_registration, <a class="code hl_typedef" href="classoperations__research_1_1math__opt_1_1_solver_interface.html#ab47a61ca53ae9cdf35dd4f2dfc9ecadb">Callback</a> cb,</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_solve_interrupter.html">SolveInterrupter</a>* interrupter) <span class="keyword">override</span>;</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> absl::Status <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a4dc835d3171da48778de1bbea39f8448">Update</a>(<span class="keyword">const</span> ModelUpdateProto& model_update) <span class="keyword">override</span>;</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a1dcbb1374e91747a2db097361b091c8b">CanUpdate</a>(<span class="keyword">const</span> ModelUpdateProto& model_update) <span class="keyword">override</span>;</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> </div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keyword">private</span>:</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// The columns of the GPLK problem.</span></div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// This structures is intentionally similar to LinearConstraints so that some</span></div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// template function can accept either of those to share code between rows and</span></div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// columns. For this purpose it also defines some aliases to some GLPK</span></div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// functions and the IsInteger() (which is trivially implemented for</span></div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// LinearConstraints).</span></div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keyword">struct </span>Variables {</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kSetBounds = glp_set_col_bnds;</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kGetLb = glp_get_col_lb;</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kGetUb = glp_get_col_ub;</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kGetType = glp_get_col_type;</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kDelElts = glp_del_cols;</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// Returns true if the given one-based column is an integer variable.</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> IsInteger(glp_prob* <span class="keyword">const</span> problem, <span class="keyword">const</span> <span class="keywordtype">int</span> j);</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> </div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// The MathOpt variable id of each column in GLPK. This is zero-based, the</span></div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// first column corresponds to the 0 and the ids.size() matches the number</span></div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="comment">// of columns.</span></div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="comment">// The id_to_index map can be used to get the GLPK column index of a given</span></div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// MathOpt variable id but the return value will be one-based (the</span></div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// convention used in GLPK). Thus this invariant holds:</span></div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="comment">// for all i in [0, num_cols), id_to_index.at(ids[i]) == i + 1</span></div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> std::vector<int64_t> ids;</div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="comment">// Map each MathOpt variable id to the column one-based index in GLPK (thus</span></div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// values are in [1, num_cols]). See the ids vector for the counter part.</span></div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> absl::flat_hash_map<int64_t, int> id_to_index;</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> </div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="comment">// The unrounded lower bound value of each column.</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">// We keep this value since GLPK's glp_intopt() expects integer bounds for</span></div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="comment">// integer variables. We need the unrounded value when the type of a</span></div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> <span class="comment">// variable is changed to continuous though by an update.</span></div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> std::vector<double> unrounded_lower_bounds;</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> </div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <span class="comment">// The unrounded upper bound value of each column.</span></div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="comment">// See unrounded_lower_bounds documentation for details..</span></div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> std::vector<double> unrounded_upper_bounds;</div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> };</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> </div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> <span class="comment">// The columns of the GPLK problem.</span></div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> <span class="comment">// See the comment on Variables for details.</span></div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> <span class="keyword">struct </span>LinearConstraints {</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kSetBounds = glp_set_row_bnds;</div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kGetLb = glp_get_row_lb;</div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kGetUb = glp_get_row_ub;</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kGetType = glp_get_row_type;</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> kDelElts = glp_del_rows;</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> </div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> <span class="comment">// Returns false. This function mirrors Variables::IsInteger() and enables</span></div>
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> <span class="comment">// sharing code between variables and constraints.</span></div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keyword">static</span> <span class="keywordtype">bool</span> IsInteger(glp_prob*, <span class="keywordtype">int</span>) { <span class="keywordflow">return</span> <span class="keyword">false</span>; }</div>
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<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> </div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> <span class="comment">// The MathOpt linear constraint id of each row in GLPK. This is zero-based,</span></div>
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> <span class="comment">// the first row corresponds to the 0 and ids.size() matches the number of</span></div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> <span class="comment">// rows.</span></div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> <span class="comment">// The id_to_index map can be used to get the GLPK row index of a given</span></div>
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<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> <span class="comment">// MathOpt variable id but the return value will be one-based (the</span></div>
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<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> <span class="comment">// convention used in GLPK). Thus this invariant holds:</span></div>
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<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> <span class="comment">// for all i in [0, num_rows), id_to_index.at(ids[i]) == i + 1</span></div>
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<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> std::vector<int64_t> ids;</div>
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<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> </div>
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<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> <span class="comment">// Map each MathOpt linear constraint id to the row one-based index in GLPK</span></div>
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<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="comment">// (thus values are in [1, num_rows]). See the ids vector for the counter</span></div>
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<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> <span class="comment">// part.</span></div>
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<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> absl::flat_hash_map<int64_t, int> id_to_index;</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="keyword">explicit</span> <a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_glpk_solver.html">GlpkSolver</a>(<span class="keyword">const</span> ModelProto& <a class="code hl_variable" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>);</div>
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<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> </div>
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<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> <span class="comment">// Appends the variables to GLPK cols.</span></div>
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<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> <span class="keywordtype">void</span> AddVariables(<span class="keyword">const</span> VariablesProto& new_variables);</div>
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<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> </div>
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<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> <span class="comment">// Appends the variables to GLPK rows.</span></div>
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<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> <span class="keywordtype">void</span> AddLinearConstraints(</div>
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<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <span class="keyword">const</span> LinearConstraintsProto& new_linear_constraints);</div>
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<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> </div>
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<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> <span class="comment">// Updates the objective coefficients with the new values in</span></div>
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<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> <span class="comment">// coefficients_proto.</span></div>
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<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> <span class="keywordtype">void</span> UpdateObjectiveCoefficients(</div>
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<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> <span class="keyword">const</span> SparseDoubleVectorProto& coefficients_proto);</div>
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<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> </div>
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<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> <span class="comment">// Updates the constraints matrix with the new values in matrix_updates.</span></div>
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<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> <span class="comment">// The first_new_(var|cstr)_id are the smallest ids of the new</span></div>
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<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="comment">// variables/constraints (in MathOpt the same id is never reused thus all</span></div>
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<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> <span class="comment">// variables with ids greater or equal to these values are new). A nullopt</span></div>
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<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> <span class="comment">// value means that there are not new variables/constraints.</span></div>
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<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> <span class="keywordtype">void</span> UpdateLinearConstraintMatrix(</div>
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<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> <span class="keyword">const</span> SparseDoubleMatrixProto& matrix_updates,</div>
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<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> std::optional<int64_t> first_new_var_id,</div>
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<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> std::optional<int64_t> first_new_cstr_id);</div>
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<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> </div>
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<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> <span class="comment">// Adds the primal solution (if it exists) to the result using the provided</span></div>
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<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> <span class="comment">// functions to get the status of the solution (GLP_FEAS, ...), its</span></div>
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<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> <span class="comment">// objective value and the structural variables values.</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">// Here `col_val` is a functions that takes a column index (i.e. the index of</span></div>
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<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> <span class="comment">// a structural variable) and returns its primal value in the solution.</span></div>
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<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> <span class="keywordtype">void</span> AddPrimalSolution(<span class="keywordtype">int</span> (*get_prim_stat)(glp_prob*),</div>
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<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> <span class="keywordtype">double</span> (*obj_val)(glp_prob*),</div>
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<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> <span class="keywordtype">double</span> (*col_val)(glp_prob*, <span class="keywordtype">int</span>),</div>
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<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> <span class="keyword">const</span> ModelSolveParametersProto& model_parameters,</div>
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<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> SolutionProto& solution_proto);</div>
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<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> </div>
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<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> <span class="comment">// Adds the dual solution (if it exists) to the result. This function must</span></div>
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<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> <span class="comment">// only be called after having solved an LP, with the provided methods</span></div>
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<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> <span class="comment">// depending on the type of LP solved.</span></div>
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<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> <span class="comment">// Here `col_dual` is a function that takes a column index (i.e. the index of</span></div>
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<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> <span class="comment">// a structural variable) and returns its dual value in the solution. The</span></div>
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<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> <span class="comment">// `row_dual` does the same for a row index (i.e. the index of an auxiliary</span></div>
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<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> <span class="comment">// variable associated to a constraint).</span></div>
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<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> <span class="keywordtype">void</span> AddDualSolution(<span class="keywordtype">int</span> (*get_dual_stat)(glp_prob*),</div>
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<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> <span class="keywordtype">double</span> (*obj_val)(glp_prob*),</div>
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<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> <span class="keywordtype">double</span> (*row_dual)(glp_prob*, <span class="keywordtype">int</span>),</div>
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<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> <span class="keywordtype">double</span> (*col_dual)(glp_prob*, <span class="keywordtype">int</span>),</div>
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<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> <span class="keyword">const</span> ModelSolveParametersProto& model_parameters,</div>
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<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> SolutionProto& solution_proto);</div>
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<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> </div>
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<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> <span class="comment">// Adds a primal or dual ray to the result depending on the value returned by</span></div>
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<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> <span class="comment">// glp_get_unbnd_ray().</span></div>
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<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> absl::Status AddPrimalOrDualRay(</div>
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<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> <span class="keyword">const</span> ModelSolveParametersProto& model_parameters,</div>
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<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> SolveResultProto& result);</div>
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<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> </div>
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<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> glp_prob* <span class="keyword">const</span> problem_;</div>
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<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> </div>
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<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> Variables variables_;</div>
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<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> LinearConstraints linear_constraints_;</div>
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<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span>};</div>
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<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> </div>
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<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span><span class="comment">// Inline functions implementation.</span></div>
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<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span><span class="comment"></span> </div>
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<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span><span class="keywordtype">bool</span> GlpkSolver::Variables::IsInteger(glp_prob* <span class="keyword">const</span> problem, <span class="keyword">const</span> <span class="keywordtype">int</span> j) {</div>
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<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> <span class="keyword">const</span> <span class="keywordtype">int</span> kind = glp_get_col_kind(problem, j);</div>
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<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> <span class="keywordflow">switch</span> (kind) {</div>
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<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> <span class="keywordflow">case</span> GLP_IV:</div>
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<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> <span class="keywordflow">case</span> GLP_BV:</div>
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<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> <span class="comment">// GLP_BV is returned when the GLPK internal kind is GLP_IV and the</span></div>
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<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> <span class="comment">// bounds are [0,1].</span></div>
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<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> <span class="keywordflow">case</span> GLP_CV:</div>
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<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span> <span class="keywordflow">default</span>:</div>
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<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span> <a class="code hl_define" href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a>(<a class="code hl_variable" href="log__severity_8h.html#acdd38e3c9f22f127d7776920e3079eda">FATAL</a>) << <span class="stringliteral">"Unexpected column kind: "</span> << kind;</div>
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<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span> }</div>
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<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span>}</div>
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<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span> </div>
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<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span>} <span class="comment">// namespace math_opt</span></div>
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<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span>} <span class="comment">// namespace operations_research</span></div>
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<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span> </div>
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<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span><span class="preprocessor">#endif </span><span class="comment">// OR_TOOLS_MATH_OPT_SOLVERS_GLPK_SOLVER_H_</span></div>
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<div class="ttc" id="abase_2logging_8h_html"><div class="ttname"><a href="base_2logging_8h.html">logging.h</a></div></div>
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<div class="ttc" id="abase_2logging_8h_html_accad43a85d781d53381cd53a9894b6ae"><div class="ttname"><a href="base_2logging_8h.html#accad43a85d781d53381cd53a9894b6ae">LOG</a></div><div class="ttdeci">#define LOG(severity)</div><div class="ttdef"><b>Definition:</b> <a href="base_2logging_8h_source.html#l00420">base/logging.h:420</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_glpk_solver_html"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_glpk_solver.html">operations_research::math_opt::GlpkSolver</a></div><div class="ttdef"><b>Definition:</b> <a href="glpk__solver_8h_source.html#l00042">glpk_solver.h:42</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_glpk_solver_html_a1dcbb1374e91747a2db097361b091c8b"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a1dcbb1374e91747a2db097361b091c8b">operations_research::math_opt::GlpkSolver::CanUpdate</a></div><div class="ttdeci">bool CanUpdate(const ModelUpdateProto &model_update) override</div><div class="ttdef"><b>Definition:</b> <a href="glpk__solver_8cc_source.html#l01737">glpk_solver.cc:1737</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_glpk_solver_html_a4dc835d3171da48778de1bbea39f8448"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a4dc835d3171da48778de1bbea39f8448">operations_research::math_opt::GlpkSolver::Update</a></div><div class="ttdeci">absl::Status Update(const ModelUpdateProto &model_update) override</div><div class="ttdef"><b>Definition:</b> <a href="glpk__solver_8cc_source.html#l01651">glpk_solver.cc:1651</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_glpk_solver_html_a61ac0bc6afed786de631c4a91faeb866"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a61ac0bc6afed786de631c4a91faeb866">operations_research::math_opt::GlpkSolver::New</a></div><div class="ttdeci">static absl::StatusOr< std::unique_ptr< SolverInterface > > New(const ModelProto &model, const InitArgs &init_args)</div><div class="ttdef"><b>Definition:</b> <a href="glpk__solver_8cc_source.html#l00844">glpk_solver.cc:844</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_glpk_solver_html_a76b75fc352b0c95032a58aa7600a47f4"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a76b75fc352b0c95032a58aa7600a47f4">operations_research::math_opt::GlpkSolver::~GlpkSolver</a></div><div class="ttdeci">~GlpkSolver() override</div><div class="ttdef"><b>Definition:</b> <a href="glpk__solver_8cc_source.html#l00881">glpk_solver.cc:881</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_glpk_solver_html_a7875bc8ab28e1cf6cefc688d7b70ac7e"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_glpk_solver.html#a7875bc8ab28e1cf6cefc688d7b70ac7e">operations_research::math_opt::GlpkSolver::Solve</a></div><div class="ttdeci">absl::StatusOr< SolveResultProto > Solve(const SolveParametersProto &parameters, const ModelSolveParametersProto &model_parameters, MessageCallback message_cb, const CallbackRegistrationProto &callback_registration, Callback cb, SolveInterrupter *interrupter) override</div><div class="ttdef"><b>Definition:</b> <a href="glpk__solver_8cc_source.html#l01006">glpk_solver.cc:1006</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_solve_interrupter_html"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_solve_interrupter.html">operations_research::math_opt::SolveInterrupter</a></div><div class="ttdef"><b>Definition:</b> <a href="solve__interrupter_8h_source.html#l00039">solve_interrupter.h:39</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_solver_interface_html"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_solver_interface.html">operations_research::math_opt::SolverInterface</a></div><div class="ttdef"><b>Definition:</b> <a href="solver__interface_8h_source.html#l00059">solver_interface.h:59</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_solver_interface_html_aad3360b1947c772bebf3d3cfb2105a15"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_solver_interface.html#aad3360b1947c772bebf3d3cfb2105a15">operations_research::math_opt::SolverInterface::MessageCallback</a></div><div class="ttdeci">std::function< void(const std::vector< std::string > &)> MessageCallback</div><div class="ttdef"><b>Definition:</b> <a href="solver__interface_8h_source.html#l00075">solver_interface.h:75</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_solver_interface_html_ab47a61ca53ae9cdf35dd4f2dfc9ecadb"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_solver_interface.html#ab47a61ca53ae9cdf35dd4f2dfc9ecadb">operations_research::math_opt::SolverInterface::Callback</a></div><div class="ttdeci">std::function< absl::StatusOr< CallbackResultProto >(const CallbackDataProto &)> Callback</div><div class="ttdef"><b>Definition:</b> <a href="solver__interface_8h_source.html#l00083">solver_interface.h:84</a></div></div>
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<div class="ttc" id="acp__model__fz__solver_8cc_html_a10a1eab179b472c030bdc2a2efef7219"><div class="ttname"><a href="cp__model__fz__solver_8cc.html#a10a1eab179b472c030bdc2a2efef7219">parameters</a></div><div class="ttdeci">SatParameters parameters</div><div class="ttdef"><b>Definition:</b> <a href="cp__model__fz__solver_8cc_source.html#l00119">cp_model_fz_solver.cc:119</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="alog__severity_8h_html_acdd38e3c9f22f127d7776920e3079eda"><div class="ttname"><a href="log__severity_8h.html#acdd38e3c9f22f127d7776920e3079eda">FATAL</a></div><div class="ttdeci">const int FATAL</div><div class="ttdef"><b>Definition:</b> <a href="log__severity_8h_source.html#l00032">log_severity.h:32</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_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="asolve__interrupter_8h_html"><div class="ttname"><a href="solve__interrupter_8h.html">solve_interrupter.h</a></div></div>
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<div class="ttc" id="asolver__interface_8h_html"><div class="ttname"><a href="solver__interface_8h.html">solver_interface.h</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1math__opt_1_1_solver_interface_1_1_init_args_html"><div class="ttname"><a href="structoperations__research_1_1math__opt_1_1_solver_interface_1_1_init_args.html">operations_research::math_opt::SolverInterface::InitArgs</a></div><div class="ttdef"><b>Definition:</b> <a href="solver__interface_8h_source.html#l00062">solver_interface.h:62</a></div></div>
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