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< a href = "adaptative__parameter__value_8h.html" > Go to the documentation of this file.< / a > < div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright 2010-2021 Google LLC< / span > < / div >
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< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > // Licensed under the Apache License, Version 2.0 (the " License" );< / span > < / div >
< div class = "line" > < a name = "l00003" > < / a > < span class = "lineno" > 3< / span >   < span class = "comment" > // you may not use this file except in compliance with the License.< / span > < / div >
< div class = "line" > < a name = "l00004" > < / a > < span class = "lineno" > 4< / span >   < span class = "comment" > // You may obtain a copy of the License at< / span > < / div >
< div class = "line" > < a name = "l00005" > < / a > < span class = "lineno" > 5< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00006" > < / a > < span class = "lineno" > 6< / span >   < span class = "comment" > // http://www.apache.org/licenses/LICENSE-2.0< / span > < / div >
< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < span class = "comment" > // Unless required by applicable law or agreed to in writing, software< / span > < / div >
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< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "comment" > // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.< / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "comment" > // See the License for the specific language governing permissions and< / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < span class = "comment" > // limitations under the License.< / span > < / div >
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< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "preprocessor" > #ifndef OR_TOOLS_UTIL_ADAPTATIVE_PARAMETER_VALUE_H_< / span > < / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "preprocessor" > #define OR_TOOLS_UTIL_ADAPTATIVE_PARAMETER_VALUE_H_< / span > < / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "preprocessor" > #include < algorithm> < / span > < / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < span class = "preprocessor" > #include < cmath> < / span > < / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "preprocessor" > #include < cstdint> < / span > < / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < span class = "preprocessor" > #include " < a class = "code" href = "integral__types_8h.html" > ortools/base/integral_types.h< / a > " < / span > < / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   < span class = "keyword" > namespace < / span > < a class = "code" href = "namespaceoperations__research.html" > operations_research< / a > {< / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "comment" > // Basic adaptive [0.0, 1.0] parameter that can be increased or decreased with a< / span > < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < span class = "comment" > // step that get smaller and smaller with the number of updates.< / span > < / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "comment" > // After a while, if the probability of getting a Decrease() vs Increase() when< / span > < / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < span class = "comment" > // running at a given value is f(value), then this should converge towards a< / span > < / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "comment" > // value such that f(value) = 0.5 provided f is a non-decreasing function over< / span > < / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   < span class = "comment" > // [0.0, 1.0].< / span > < / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < span class = "comment" > // TODO(user): The current logic work well in practice, but has no strong< / span > < / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "comment" > // theoretical foundation. We should be able to come up with a better understood< / span > < / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "comment" > // formula that converge way faster. It will also be nice to generalize the 0.5< / span > < / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "comment" > // above to a target probability p.< / span > < / div >
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< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1_adaptive_parameter_value.html" > 37< / a > < / span >   < span class = "keyword" > class < / span > < a class = "code" href = "classoperations__research_1_1_adaptive_parameter_value.html" > AdaptiveParameterValue< / a > {< / div >
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< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   < span class = "keyword" > public< / span > :< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < span class = "comment" > // Initial value is in [0.0, 1.0], both 0.0 and 1.0 are valid.< / span > < / div >
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< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1_adaptive_parameter_value.html#a5910cbe817fbb6a65be0c3ddf2534f35" > 40< / a > < / span >   < span class = "keyword" > explicit< / span > < a class = "code" href = "classoperations__research_1_1_adaptive_parameter_value.html#a5910cbe817fbb6a65be0c3ddf2534f35" > AdaptiveParameterValue< / a > (< span class = "keywordtype" > double< / span > initial_value)< / div >
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< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   : value_(initial_value) {}< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   < / div >
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< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1_adaptive_parameter_value.html#a372de693ad40b3f42839c8ec6ac845f4" > 43< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "classoperations__research_1_1_adaptive_parameter_value.html#a372de693ad40b3f42839c8ec6ac845f4" > Reset< / a > () { num_changes_ = 0; }< / div >
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< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   < / div >
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< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1_adaptive_parameter_value.html#ab7ff2156358799e542088856d0629b4d" > 45< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "classoperations__research_1_1_adaptive_parameter_value.html#ab7ff2156358799e542088856d0629b4d" > Increase< / a > () {< / div >
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< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > double< / span > factor = IncreaseNumChangesAndGetFactor();< / div >
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< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   value_ = < a class = "code" href = "alldiff__cst_8cc.html#ad10edae0a852d72fb76afb1c77735045" > std::min< / a > (1.0 - (1.0 - value_) / factor, value_ * factor);< / div >
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< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   }< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < / div >
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< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1_adaptive_parameter_value.html#a1279941cc24e4b9a3f35ff075b7943ac" > 50< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "classoperations__research_1_1_adaptive_parameter_value.html#a1279941cc24e4b9a3f35ff075b7943ac" > Decrease< / a > () {< / div >
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< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > double< / span > factor = IncreaseNumChangesAndGetFactor();< / div >
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< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   value_ = < a class = "code" href = "alldiff__cst_8cc.html#a26e6db9bcc64b584051ecc28171ed11f" > std::max< / a > (value_ / factor, 1.0 - (1.0 - value_) * factor);< / div >
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< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   }< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < span class = "comment" > // If we get more than 1 datapoints from the same value(), we use a formula< / span > < / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "comment" > // that is more sound than calling n times Increase()/Decrease() which depends< / span > < / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "comment" > // on the order of calls.< / span > < / div >
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< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1_adaptive_parameter_value.html#af9bf551154d37f48132472bd0f6dd848" > 58< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "classoperations__research_1_1_adaptive_parameter_value.html#af9bf551154d37f48132472bd0f6dd848" > Update< / a > (< span class = "keywordtype" > int< / span > num_decreases, < span class = "keywordtype" > int< / span > num_increases) {< / div >
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< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "keywordflow" > if< / span > (num_decreases == num_increases) {< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   num_changes_ += num_decreases + num_increases;< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   } < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (num_decreases < num_increases) {< / div >
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< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = num_decreases; i < num_increases; ++i) < a class = "code" href = "classoperations__research_1_1_adaptive_parameter_value.html#ab7ff2156358799e542088856d0629b4d" > Increase< / a > ();< / div >
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< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   num_changes_ += 2 * num_decreases;< / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   } < span class = "keywordflow" > else< / span > {< / div >
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< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = num_increases; i < num_decreases; ++i) < a class = "code" href = "classoperations__research_1_1_adaptive_parameter_value.html#a1279941cc24e4b9a3f35ff075b7943ac" > Decrease< / a > ();< / div >
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< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   num_changes_ += 2 * num_increases;< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   }< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   }< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   < / div >
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< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1_adaptive_parameter_value.html#a374f9f0250d7e270cc4bf301edb46523" > 70< / a > < / span >   < span class = "keywordtype" > double< / span > < a class = "code" href = "classoperations__research_1_1_adaptive_parameter_value.html#a374f9f0250d7e270cc4bf301edb46523" > value< / a > ()< span class = "keyword" > const < / span > { < span class = "keywordflow" > return< / span > value_; }< / div >
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< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   < / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   < span class = "keyword" > private< / span > :< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   < span class = "comment" > // We want to change the parameters more and more slowly.< / span > < / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   < span class = "keywordtype" > double< / span > IncreaseNumChangesAndGetFactor() {< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   ++num_changes_;< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   < span class = "keywordflow" > return< / span > 1.0 + 1.0 / std::sqrt(num_changes_ + 1);< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   }< / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   < / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   < span class = "keywordtype" > double< / span > value_;< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   int64_t num_changes_ = 0;< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   };< / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   < / div >
< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   } < span class = "comment" > // namespace operations_research< / span > < / div >
< div class = "line" > < a name = "l00084" > < / a > < span class = "lineno" > 84< / span >   < / div >
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< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   < span class = "preprocessor" > #endif < / span > < span class = "comment" > // OR_TOOLS_UTIL_ADAPTATIVE_PARAMETER_VALUE_H_< / span > < / div >
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< div class = "ttc" id = "aalldiff__cst_8cc_html_a26e6db9bcc64b584051ecc28171ed11f" > < div class = "ttname" > < a href = "alldiff__cst_8cc.html#a26e6db9bcc64b584051ecc28171ed11f" > max< / a > < / div > < div class = "ttdeci" > int64_t max< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "alldiff__cst_8cc_source.html#l00140" > alldiff_cst.cc:140< / a > < / div > < / div >
< div class = "ttc" id = "aalldiff__cst_8cc_html_ad10edae0a852d72fb76afb1c77735045" > < div class = "ttname" > < a href = "alldiff__cst_8cc.html#ad10edae0a852d72fb76afb1c77735045" > min< / a > < / div > < div class = "ttdeci" > int64_t min< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "alldiff__cst_8cc_source.html#l00139" > alldiff_cst.cc:139< / a > < / div > < / div >
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< div class = "ttc" id = "aclassoperations__research_1_1_adaptive_parameter_value_html" > < div class = "ttname" > < a href = "classoperations__research_1_1_adaptive_parameter_value.html" > operations_research::AdaptiveParameterValue< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "adaptative__parameter__value_8h_source.html#l00037" > adaptative_parameter_value.h:37< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1_adaptive_parameter_value_html_a1279941cc24e4b9a3f35ff075b7943ac" > < div class = "ttname" > < a href = "classoperations__research_1_1_adaptive_parameter_value.html#a1279941cc24e4b9a3f35ff075b7943ac" > operations_research::AdaptiveParameterValue::Decrease< / a > < / div > < div class = "ttdeci" > void Decrease()< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "adaptative__parameter__value_8h_source.html#l00050" > adaptative_parameter_value.h:50< / a > < / div > < / div >
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< div class = "ttc" id = "aclassoperations__research_1_1_adaptive_parameter_value_html_a372de693ad40b3f42839c8ec6ac845f4" > < div class = "ttname" > < a href = "classoperations__research_1_1_adaptive_parameter_value.html#a372de693ad40b3f42839c8ec6ac845f4" > operations_research::AdaptiveParameterValue::Reset< / a > < / div > < div class = "ttdeci" > void Reset()< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "adaptative__parameter__value_8h_source.html#l00043" > adaptative_parameter_value.h:43< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1_adaptive_parameter_value_html_a374f9f0250d7e270cc4bf301edb46523" > < div class = "ttname" > < a href = "classoperations__research_1_1_adaptive_parameter_value.html#a374f9f0250d7e270cc4bf301edb46523" > operations_research::AdaptiveParameterValue::value< / a > < / div > < div class = "ttdeci" > double value() const< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "adaptative__parameter__value_8h_source.html#l00070" > adaptative_parameter_value.h:70< / a > < / div > < / div >
2020-10-09 12:00:09 +02:00
< div class = "ttc" id = "aclassoperations__research_1_1_adaptive_parameter_value_html_a5910cbe817fbb6a65be0c3ddf2534f35" > < div class = "ttname" > < a href = "classoperations__research_1_1_adaptive_parameter_value.html#a5910cbe817fbb6a65be0c3ddf2534f35" > operations_research::AdaptiveParameterValue::AdaptiveParameterValue< / a > < / div > < div class = "ttdeci" > AdaptiveParameterValue(double initial_value)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "adaptative__parameter__value_8h_source.html#l00040" > adaptative_parameter_value.h:40< / a > < / div > < / div >
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< div class = "ttc" id = "aclassoperations__research_1_1_adaptive_parameter_value_html_ab7ff2156358799e542088856d0629b4d" > < div class = "ttname" > < a href = "classoperations__research_1_1_adaptive_parameter_value.html#ab7ff2156358799e542088856d0629b4d" > operations_research::AdaptiveParameterValue::Increase< / a > < / div > < div class = "ttdeci" > void Increase()< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "adaptative__parameter__value_8h_source.html#l00045" > adaptative_parameter_value.h:45< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1_adaptive_parameter_value_html_af9bf551154d37f48132472bd0f6dd848" > < div class = "ttname" > < a href = "classoperations__research_1_1_adaptive_parameter_value.html#af9bf551154d37f48132472bd0f6dd848" > operations_research::AdaptiveParameterValue::Update< / a > < / div > < div class = "ttdeci" > void Update(int num_decreases, int num_increases)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "adaptative__parameter__value_8h_source.html#l00058" > adaptative_parameter_value.h:58< / a > < / div > < / div >
< div class = "ttc" id = "aintegral__types_8h_html" > < div class = "ttname" > < a href = "integral__types_8h.html" > integral_types.h< / a > < / div > < / div >
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< div class = "ttc" id = "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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