64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
// Copyright 2010-2021 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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#include <stdlib.h>
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#include "ortools/base/logging.h"
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#include "ortools/sat/cp_model.h"
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#include "ortools/util/sorted_interval_list.h"
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namespace operations_research {
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namespace sat {
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void OptionalIntervalSampleSat() {
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CpModelBuilder cp_model;
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const int kHorizon = 100;
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const Domain horizon(0, kHorizon);
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// An optional interval can be created from three affine expressions and a
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// BoolVar.
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const IntVar x = cp_model.NewIntVar(horizon).WithName("x");
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const IntVar y = cp_model.NewIntVar({2, 4}).WithName("y");
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const IntVar z = cp_model.NewIntVar(horizon).WithName("z");
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const BoolVar presence_var = cp_model.NewBoolVar().WithName("presence");
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const IntervalVar interval_var =
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cp_model.NewOptionalIntervalVar(x, y, z + 2, presence_var)
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.WithName("interval");
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LOG(INFO) << "start = " << interval_var.StartExpr()
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<< ", size = " << interval_var.SizeExpr()
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<< ", end = " << interval_var.EndExpr()
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<< ", presence = " << interval_var.PresenceBoolVar()
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<< ", interval_var = " << interval_var;
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// If the size is fixed, a simpler version uses the start expression and the
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// size.
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const IntervalVar fixed_size_interval_var =
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cp_model.NewOptionalFixedSizeIntervalVar(x, 10, presence_var)
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.WithName("fixed_size_interval_var");
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LOG(INFO) << "start = " << fixed_size_interval_var.StartExpr()
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<< ", size = " << fixed_size_interval_var.SizeExpr()
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<< ", end = " << fixed_size_interval_var.EndExpr()
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<< ", presence = " << fixed_size_interval_var.PresenceBoolVar()
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<< ", interval_var = " << fixed_size_interval_var;
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}
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} // namespace sat
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} // namespace operations_research
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int main() {
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operations_research::sat::OptionalIntervalSampleSat();
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return EXIT_SUCCESS;
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}
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