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<a href="gscip__solver__callback_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_GSCIP_SOLVER_CALLBACK_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_GSCIP_SOLVER_CALLBACK_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 <memory></span></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#include <optional></span></div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> </div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#include "absl/base/thread_annotations.h"</span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#include "absl/status/status.h"</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/synchronization/mutex.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/time/time.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 "ortools/math_opt/callback.pb.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="solver__interface_8h.html">ortools/math_opt/core/solver_interface.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 "scip/type_scip.h"</span></div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</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="l00029" name="l00029"></a><span class="lineno"> 29</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="l00030" name="l00030"></a><span class="lineno"> 30</span> </div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="comment">// Handler for user callbacks for GScipSolver.</span></div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="comment">//</span></div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="comment">// It deals with solve interruption when the user request it or when an error</span></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment">// occurs during the call of the user callback. Any such error is returned by</span></div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="comment">// Flush().</span></div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="comment">//</span></div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="comment">// TODO(b/193537362): see if we need to share code with the handling of</span></div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="comment">// SolveInterrupter. It is likely that it could the case to make sure the</span></div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment">// `userinterrupt` flag is not lost. It may require sharing the same SCIP event</span></div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="comment">// handler to make sure the user callback is called first; but maybe that is not</span></div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment">// necessary.</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_g_scip_solver_callback_handler.html"> 42</a></span><span class="keyword">class </span><a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html">GScipSolverCallbackHandler</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="comment">// Returns a non null handler if needed (there are supported events that we</span></div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="comment">// register to).</span></div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// The caller will also have to use MessageHandler() when calling</span></div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// GScip::Solve() when the result is not nullptr.</span></div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="comment">// At the end of the solve, Flush() must be called (when everything else</span></div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="comment">// succeeded) to make the final user callback calls and return the first error</span></div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="comment">// that occurred when calling the user callback.</span></div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="keyword">static</span> std::unique_ptr<GScipSolverCallbackHandler> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#a22cd7715028df18c5f7fc75837b3975b">RegisterIfNeeded</a>(</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="keyword">const</span> CallbackRegistrationProto& callback_registration,</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <a class="code hl_typedef" href="classoperations__research_1_1math__opt_1_1_solver_interface.html#ab47a61ca53ae9cdf35dd4f2dfc9ecadb">SolverInterface::Callback</a> <a class="code hl_variable" href="gurobi__interface_8cc.html#a6627a3800ac768bb5528ef54c9cace36">callback</a>, absl::Time solve_start, SCIP* scip);</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> </div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"><a class="line" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#af73659e6ed12390aa474bb5819a93f92"> 57</a></span> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#af73659e6ed12390aa474bb5819a93f92">GScipSolverCallbackHandler</a>(<span class="keyword">const</span> <a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html">GScipSolverCallbackHandler</a>&) = <span class="keyword">delete</span>;</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"><a class="line" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#a15964415c4071c2be07265c2fa7de92b"> 58</a></span> <a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html">GScipSolverCallbackHandler</a>& <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#a15964415c4071c2be07265c2fa7de92b">operator=</a>(<span class="keyword">const</span> <a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html">GScipSolverCallbackHandler</a>&) =</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keyword">delete</span>;</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> </div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// Makes any last pending calls and returns the first error that occurred</span></div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// while calling the user callback. Returns OkStatus if no error has occurred.</span></div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> absl::Status <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#a58544266058bce093b84364979af75ba">Flush</a>();</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="keyword">private</span>:</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#af73659e6ed12390aa474bb5819a93f92">GScipSolverCallbackHandler</a>(<a class="code hl_typedef" href="classoperations__research_1_1math__opt_1_1_solver_interface.html#ab47a61ca53ae9cdf35dd4f2dfc9ecadb">SolverInterface::Callback</a> <a class="code hl_variable" href="gurobi__interface_8cc.html#a6627a3800ac768bb5528ef54c9cace36">callback</a>,</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> absl::Time solve_start, SCIP* scip);</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="comment">// Makes a call to the user callback, updating the status_ and interrupting</span></div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// the solve if needed (in case of error or if requested by the user).</span></div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// This function will ignores calls when status_ is not ok. It returns the</span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// result of the call of the callback when the call has successfully been made</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// and the user has not requested the termination of the solve.</span></div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// This function will hold the callback_mutex_ while making the call to the</span></div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// user callback to serialize calls.</span></div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> std::optional<CallbackResultProto> CallUserCallback(</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="keyword">const</span> CallbackDataProto& callback_data)</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> ABSL_LOCKS_EXCLUDED(callback_mutex_);</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> </div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// The user callback. Should be called via CallUserCallback().</span></div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keyword">const</span> <a class="code hl_typedef" href="classoperations__research_1_1math__opt_1_1_solver_interface.html#ab47a61ca53ae9cdf35dd4f2dfc9ecadb">SolverInterface::Callback</a> callback_;</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> </div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="comment">// Start time of the solve.</span></div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="keyword">const</span> absl::Time solve_start_;</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> </div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// The SCIP solver, used for interruptions.</span></div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> SCIP* <span class="keyword">const</span> scip_;</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">// Mutex serializing calls to the user callback and the access to status_.</span></div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> absl::Mutex callback_mutex_;</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> </div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="comment">// The first error status returned by the user callback.</span></div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> absl::Status status_ ABSL_GUARDED_BY(callback_mutex_);</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span>};</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">// namespace math_opt</span></div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span>} <span class="comment">// namespace operations_research</span></div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> </div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span><span class="preprocessor">#endif </span><span class="comment">// OR_TOOLS_MATH_OPT_SOLVERS_GSCIP_SOLVER_CALLBACK_H_</span></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler_html"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html">operations_research::math_opt::GScipSolverCallbackHandler</a></div><div class="ttdef"><b>Definition:</b> <a href="gscip__solver__callback_8h_source.html#l00042">gscip_solver_callback.h:42</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler_html_a15964415c4071c2be07265c2fa7de92b"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#a15964415c4071c2be07265c2fa7de92b">operations_research::math_opt::GScipSolverCallbackHandler::operator=</a></div><div class="ttdeci">GScipSolverCallbackHandler & operator=(const GScipSolverCallbackHandler &)=delete</div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler_html_a22cd7715028df18c5f7fc75837b3975b"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#a22cd7715028df18c5f7fc75837b3975b">operations_research::math_opt::GScipSolverCallbackHandler::RegisterIfNeeded</a></div><div class="ttdeci">static std::unique_ptr< GScipSolverCallbackHandler > RegisterIfNeeded(const CallbackRegistrationProto &callback_registration, SolverInterface::Callback callback, absl::Time solve_start, SCIP *scip)</div><div class="ttdef"><b>Definition:</b> <a href="gscip__solver__callback_8cc_source.html#l00038">gscip_solver_callback.cc:38</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler_html_a58544266058bce093b84364979af75ba"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#a58544266058bce093b84364979af75ba">operations_research::math_opt::GScipSolverCallbackHandler::Flush</a></div><div class="ttdeci">absl::Status Flush()</div><div class="ttdef"><b>Definition:</b> <a href="gscip__solver__callback_8cc_source.html#l00053">gscip_solver_callback.cc:53</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler_html_af73659e6ed12390aa474bb5819a93f92"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_g_scip_solver_callback_handler.html#af73659e6ed12390aa474bb5819a93f92">operations_research::math_opt::GScipSolverCallbackHandler::GScipSolverCallbackHandler</a></div><div class="ttdeci">GScipSolverCallbackHandler(const GScipSolverCallbackHandler &)=delete</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="agurobi__interface_8cc_html_a6627a3800ac768bb5528ef54c9cace36"><div class="ttname"><a href="gurobi__interface_8cc.html#a6627a3800ac768bb5528ef54c9cace36">callback</a></div><div class="ttdeci">MPCallback * callback</div><div class="ttdef"><b>Definition:</b> <a href="gurobi__interface_8cc_source.html#l00515">gurobi_interface.cc:515</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="asolver__interface_8h_html"><div class="ttname"><a href="solver__interface_8h.html">solver_interface.h</a></div></div>
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