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<a href="update__tracker_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_CPP_UPDATE_TRACKER_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_CPP_UPDATE_TRACKER_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/status/status.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/statusor.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/strings/string_view.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 "<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="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include "ortools/math_opt/model.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 "ortools/math_opt/model_update.pb.h"</span> <span class="comment">// IWYU pragma: export</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="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="l00028" name="l00028"></a><span class="lineno"> 28</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="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="comment">// Tracks the changes of the model.</span></div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="comment">//</span></div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="comment">// This is an advanced feature that most users won't need. It is used internally</span></div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="comment">// to implement incrementalism but users don't have to understand how it works</span></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment">// to use incremental solve.</span></div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="comment">//</span></div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="comment">// For each update tracker we define a checkpoint that is the starting point</span></div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="comment">// used to compute the ModelUpdateProto.</span></div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="comment">//</span></div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment">// No member function should be called after the destruction of the Model</span></div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="comment">// object. Note though that it is safe to call the destructor of UpdateTracker</span></div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment">// even if the Model object has been destroyed already.</span></div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment">//</span></div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment">// Thread-safety: UpdateTracker methods must not be used while modifying the</span></div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="comment">// model (variables, constraints, ...). The user is expected to use proper</span></div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="comment">// synchronization primitives to serialize changes to the model and the use of</span></div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="comment">// the update trackers. The methods of different instances of UpdateTracker are</span></div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="comment">// safe to be called concurrently (i.e. multiple trackers can be called</span></div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="comment">// concurrently on ExportModelUpdate() or Checkpoint()). The destructor of</span></div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="comment">// UpdateTracker is thread-safe.</span></div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span><span class="comment">//</span></div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="comment">// Example:</span></div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="comment">// Model model;</span></div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="comment">// ...</span></div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="comment">// const std::unique_ptr<UpdateTracker> update_tracker =</span></div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="comment">// model.NewUpdateTracker();</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">// model.AddVariable(0.0, 1.0, true, "y");</span></div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="comment">// model.set_maximize(true);</span></div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span><span class="comment">//</span></div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="comment">// ASSIGN_OR_RETURN(const std::optional<ModelUpdateProto> update_proto,</span></div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="comment">// update_tracker.ExportModelUpdate());</span></div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="comment">// RETURN_IF_ERROR(update_tracker.Checkpoint());</span></div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span><span class="comment">//</span></div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span><span class="comment">// if (update_proto) {</span></div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="comment">// ... use *update_proto here ...</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"><a class="line" href="classoperations__research_1_1math__opt_1_1_update_tracker.html"> 67</a></span><span class="keyword">class </span><a class="code hl_class" href="classoperations__research_1_1math__opt_1_1_update_tracker.html">UpdateTracker</a> {</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">public</span>:</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="comment">// This constructor should not be used directly. Instead use</span></div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// Model::NewUpdateTracker().</span></div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="keyword">explicit</span> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_update_tracker.html#ac2a332eb6368f4284b4a4df05c4d908e">UpdateTracker</a>(<span class="keyword">const</span> std::shared_ptr<ModelStorage>& storage);</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> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_update_tracker.html#a78d9c1d19dd2c2dfb6676e86467a26ab">~UpdateTracker</a>();</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> </div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="comment">// Returns a proto representation of the changes to the model since the most</span></div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// recent checkpoint (i.e. last time Checkpoint() was called); nullopt if</span></div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// the update would have been empty.</span></div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="comment">// If fails if the Model has been destroyed.</span></div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> absl::StatusOr<std::optional<ModelUpdateProto>> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_update_tracker.html#adb1db469f9f630df9d30765b6e979421">ExportModelUpdate</a>();</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">// Uses the current model state as the starting point to calculate the</span></div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="comment">// ModelUpdateProto next time ExportModelUpdate() is called.</span></div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="comment">// If fails if the Model has been destroyed.</span></div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> absl::Status <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_update_tracker.html#aa0cbaa0e5ce68b2d2632d5d6dc1e7298">Checkpoint</a>();</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">// Returns a proto representation of the whole model.</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">// This is a shortcut method that is equivalent to calling</span></div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="comment">// Model::ExportModel(). It is there so that users of the UpdateTracker</span></div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> <span class="comment">// can avoid having to keep a reference to the Model model.</span></div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="comment">//</span></div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="comment">// If fails if the Model has been destroyed.</span></div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> absl::StatusOr<ModelProto> <a class="code hl_function" href="classoperations__research_1_1math__opt_1_1_update_tracker.html#a0decc84a2c495861a7ef695bba267b3b">ExportModel</a>() <span class="keyword">const</span>;</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> <span class="keyword">private</span>:</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <span class="keyword">const</span> std::weak_ptr<ModelStorage> storage_;</div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="keyword">const</span> UpdateTrackerId update_tracker_;</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> </div>
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceinternal.html">internal</a> {</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 failure message used when a function of UpdateTracker is called after the</span></div>
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<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span><span class="comment">// destruction of the model..</span></div>
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<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"><a class="line" href="namespaceoperations__research_1_1math__opt_1_1internal.html#ad9f690e3188dfbed5cebc3eb8dfb2c3f"> 106</a></span><span class="keyword">constexpr</span> absl::string_view <a class="code hl_variable" href="namespaceoperations__research_1_1math__opt_1_1internal.html#ad9f690e3188dfbed5cebc3eb8dfb2c3f">kModelIsDestroyed</a> =</div>
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<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> <span class="stringliteral">"can't call this function after the associated model has been destroyed"</span>;</div>
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<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> </div>
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span>} <span class="comment">// namespace internal</span></div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> </div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span>} <span class="comment">// namespace math_opt</span></div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span>} <span class="comment">// namespace operations_research</span></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="preprocessor">#endif </span><span class="comment">// OR_TOOLS_MATH_OPT_CPP_UPDATE_TRACKER_H_</span></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_update_tracker_html"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_update_tracker.html">operations_research::math_opt::UpdateTracker</a></div><div class="ttdef"><b>Definition:</b> <a href="update__tracker_8h_source.html#l00067">update_tracker.h:67</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_update_tracker_html_a0decc84a2c495861a7ef695bba267b3b"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_update_tracker.html#a0decc84a2c495861a7ef695bba267b3b">operations_research::math_opt::UpdateTracker::ExportModel</a></div><div class="ttdeci">absl::StatusOr< ModelProto > ExportModel() const</div><div class="ttdef"><b>Definition:</b> <a href="update__tracker_8cc_source.html#l00060">update_tracker.cc:60</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_update_tracker_html_a78d9c1d19dd2c2dfb6676e86467a26ab"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_update_tracker.html#a78d9c1d19dd2c2dfb6676e86467a26ab">operations_research::math_opt::UpdateTracker::~UpdateTracker</a></div><div class="ttdeci">~UpdateTracker()</div><div class="ttdef"><b>Definition:</b> <a href="update__tracker_8cc_source.html#l00028">update_tracker.cc:28</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_update_tracker_html_aa0cbaa0e5ce68b2d2632d5d6dc1e7298"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_update_tracker.html#aa0cbaa0e5ce68b2d2632d5d6dc1e7298">operations_research::math_opt::UpdateTracker::Checkpoint</a></div><div class="ttdeci">absl::Status Checkpoint()</div><div class="ttdef"><b>Definition:</b> <a href="update__tracker_8cc_source.html#l00051">update_tracker.cc:51</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_update_tracker_html_ac2a332eb6368f4284b4a4df05c4d908e"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_update_tracker.html#ac2a332eb6368f4284b4a4df05c4d908e">operations_research::math_opt::UpdateTracker::UpdateTracker</a></div><div class="ttdeci">UpdateTracker(const std::shared_ptr< ModelStorage > &storage)</div><div class="ttdef"><b>Definition:</b> <a href="update__tracker_8cc_source.html#l00038">update_tracker.cc:38</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1math__opt_1_1_update_tracker_html_adb1db469f9f630df9d30765b6e979421"><div class="ttname"><a href="classoperations__research_1_1math__opt_1_1_update_tracker.html#adb1db469f9f630df9d30765b6e979421">operations_research::math_opt::UpdateTracker::ExportModelUpdate</a></div><div class="ttdeci">absl::StatusOr< std::optional< ModelUpdateProto > > ExportModelUpdate()</div><div class="ttdef"><b>Definition:</b> <a href="update__tracker_8cc_source.html#l00043">update_tracker.cc:43</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="anamespaceinternal_html"><div class="ttname"><a href="namespaceinternal.html">internal</a></div><div class="ttdef"><b>Definition:</b> <a href="connected__components_8h_source.html#l00138">connected_components.h:138</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_1_1math__opt_1_1internal_html_ad9f690e3188dfbed5cebc3eb8dfb2c3f"><div class="ttname"><a href="namespaceoperations__research_1_1math__opt_1_1internal.html#ad9f690e3188dfbed5cebc3eb8dfb2c3f">operations_research::math_opt::internal::kModelIsDestroyed</a></div><div class="ttdeci">constexpr absl::string_view kModelIsDestroyed</div><div class="ttdef"><b>Definition:</b> <a href="update__tracker_8h_source.html#l00106">update_tracker.h:106</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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<li class="navelem"><a class="el" href="dir_a7cc1eeded8f693d0da6c729bc88c45a.html">ortools</a></li><li class="navelem"><a class="el" href="dir_1defc00030ff81d309105e053121082f.html">math_opt</a></li><li class="navelem"><a class="el" href="dir_dd5645fbbabcdccb47d1d6db92f0f35b.html">cpp</a></li><li class="navelem"><a class="el" href="update__tracker_8h.html">update_tracker.h</a></li>
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