69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
// Copyright 2010-2024 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef OR_TOOLS_SAT_LINEAR_MODEL_H_
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#define OR_TOOLS_SAT_LINEAR_MODEL_H_
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#include <vector>
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#include "ortools/sat/cp_model.pb.h"
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namespace operations_research {
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namespace sat {
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// This class is meant to be a view on the full CpModelProto, with hidden and
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// additional constraints.
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// Currently, this class is meant to be used by the feasibility jump subsolver.
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// It could also contains the linear relaxation at level 1 or 2 of the model and
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// could be computed once for all workers of a given linearization level.
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class LinearModel {
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public:
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explicit LinearModel(const CpModelProto& model_proto);
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const CpModelProto& model_proto() const { return model_proto_; }
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// Mask on the constraints of the model passed to the ctor.
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const std::vector<bool>& ignored_constraints() const {
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return ignored_constraints_;
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}
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// Additional constraints created during the initialization.
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const std::vector<ConstraintProto>& additional_constraints() const {
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return additional_constraints_;
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}
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int num_ignored_constraints() const { return num_ignored_constraints_; }
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int num_exactly_ones() const { return num_exactly_ones_; }
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int num_full_encodings() const { return num_full_encodings_; }
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int num_element_encodings() const { return num_element_encodings_; }
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private:
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// Initial model.
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const CpModelProto& model_proto_;
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// Model delta.
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std::vector<bool> ignored_constraints_;
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std::vector<ConstraintProto> additional_constraints_;
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// Statistics.
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int num_ignored_constraints_ = 0;
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int num_exactly_ones_ = 0;
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int num_full_encodings_ = 0;
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int num_element_encodings_ = 0;
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};
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} // namespace sat
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} // namespace operations_research
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#endif // OR_TOOLS_SAT_LINEAR_MODEL_H_
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