2d_mandatory_overlap_propagator.h

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// Copyright 2010-2025 Google LLC
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#ifndef OR_TOOLS_SAT_2D_MANDATORY_OVERLAP_PROPAGATOR_H_
#define OR_TOOLS_SAT_2D_MANDATORY_OVERLAP_PROPAGATOR_H_
 
#include <cstdint>
#include <vector>
 
#include "ortools/sat/diffn_util.h"
#include "ortools/sat/integer.h"
#include "ortools/sat/model.h"
#include "ortools/sat/no_overlap_2d_helper.h"
#include "ortools/sat/synchronization.h"
 
namespace operations_research {
namespace sat {
 
// Propagator that checks that no mandatory area of two boxes overlap in
// O(N * log N) time.
void CreateAndRegisterMandatoryOverlapPropagator(
    NoOverlap2DConstraintHelper* helper, Model* model,
    GenericLiteralWatcher* watcher, int priority);
 
// Exposed for testing.
class MandatoryOverlapPropagator : public PropagatorInterface {
 public:
  MandatoryOverlapPropagator(NoOverlap2DConstraintHelper* helper, Model* model)
      : helper_(*helper),
        shared_stats_(model->GetOrCreate<SharedStatistics>()) {}
 
  ~MandatoryOverlapPropagator() override;
 
  bool Propagate() final;
  int RegisterWith(GenericLiteralWatcher* watcher);
 
 private:
  NoOverlap2DConstraintHelper& helper_;
  SharedStatistics* shared_stats_;
  std::vector<Rectangle> mandatory_regions_;
  std::vector<int> mandatory_regions_index_;
 
  int64_t num_conflicts_ = 0;
  int64_t num_calls_zero_area_ = 0;
  int64_t num_calls_nonzero_area_ = 0;
 
  MandatoryOverlapPropagator(const MandatoryOverlapPropagator&) = delete;
  MandatoryOverlapPropagator& operator=(const MandatoryOverlapPropagator&) =
      delete;
};
 
}  // namespace sat
}  // namespace operations_research
 
#endif  // OR_TOOLS_SAT_2D_MANDATORY_OVERLAP_PROPAGATOR_H_