70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
// Copyright 2010-2017 Google
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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 "ortools/sat/cp_model.pb.h"
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#include "ortools/sat/cp_model_solver.h"
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#include "ortools/sat/cp_model_utils.h"
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#include "ortools/sat/model.h"
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namespace operations_research {
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namespace sat {
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void ReifiedSample() {
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CpModelProto cp_model;
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auto new_boolean_variable = [&cp_model]() {
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const int index = cp_model.variables_size();
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IntegerVariableProto* const var = cp_model.add_variables();
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var->add_domain(0);
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var->add_domain(1);
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return index;
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};
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auto add_bool_or = [&cp_model](const std::vector<int>& literals) {
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BoolArgumentProto* const bool_or =
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cp_model.add_constraints()->mutable_bool_or();
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for (const int lit : literals) {
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bool_or->add_literals(lit);
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}
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};
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auto add_reified_bool_and = [&cp_model](const std::vector<int>& literals,
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const int literal) {
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ConstraintProto* const ct = cp_model.add_constraints();
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ct->add_enforcement_literal(literal);
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for (const int lit : literals) {
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ct->mutable_bool_and()->add_literals(lit);
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}
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};
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const int x = new_boolean_variable();
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const int y = new_boolean_variable();
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const int b = new_boolean_variable();
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// First version using a half-reified bool and.
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add_reified_bool_and({x, NegatedRef(y)}, b);
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// Second version using bool or.
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add_bool_or({NegatedRef(b), x});
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add_bool_or({NegatedRef(b), NegatedRef(y)});
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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::ReifiedSample();
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return EXIT_SUCCESS;
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}
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