4f381f6d07
* bump abseil to 20250814 * bump protobuf to v32.0 * cmake: add ccache auto support * backport flatzinc, math_opt and sat update
60 lines
2.3 KiB
C++
60 lines
2.3 KiB
C++
// Copyright 2010-2025 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_COMBINE_SOLUTIONS_H_
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#define OR_TOOLS_SAT_COMBINE_SOLUTIONS_H_
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#include <cstdint>
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#include <memory>
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#include <optional>
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#include <string>
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#include <vector>
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#include "absl/strings/string_view.h"
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#include "absl/types/span.h"
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#include "ortools/sat/cp_model.pb.h"
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#include "ortools/sat/model.h"
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#include "ortools/sat/synchronization.h"
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namespace operations_research {
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namespace sat {
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// Given a `new_solution` that was created by changing a bit a `base_solution`,
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// try to apply the same changes to the other solutions stored in the
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// `response_manager` and return any such generated solution that is valid.
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std::optional<std::vector<int64_t>> FindCombinedSolution(
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const CpModelProto& model, absl::Span<const int64_t> new_solution,
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absl::Span<const int64_t> base_solution,
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const SharedResponseManager* response_manager, std::string* solution_info);
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// This is equivalent to calling SharedResponseManager::NewSolution() then, if
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// `base_solution` is non-empty, trying to find a combined solution and calling
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// SharedResponseManager::NewSolution() again if an improved solution is found.
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struct PushedSolutionPointers {
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std::shared_ptr<const SharedSolutionRepository<int64_t>::Solution>
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pushed_solution;
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// nullptr if no improvement was found.
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std::shared_ptr<const SharedSolutionRepository<int64_t>::Solution>
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improved_solution;
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};
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PushedSolutionPointers PushAndMaybeCombineSolution(
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SharedResponseManager* response_manager, const CpModelProto& model_proto,
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absl::Span<const int64_t> new_solution, absl::string_view solution_info,
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std::shared_ptr<const SharedSolutionRepository<int64_t>::Solution>
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base_solution);
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} // namespace sat
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} // namespace operations_research
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#endif // OR_TOOLS_SAT_COMBINE_SOLUTIONS_H_
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