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Expose add_exactly_one and add_at_most_one #98

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Expose add_exactly_one and add_at_most_one #98

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10 changes: 10 additions & 0 deletions ext/or-tools/constraint.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -765,6 +765,16 @@ void init_constraint(Rice::Module& m) {
[](CpModelBuilder& self, const std::vector<BoolVar>& literals) {
return self.AddBoolXor(literals);
})
.define_method(
"add_at_most_one",
[](CpModelBuilder& self, const std::vector<BoolVar>& literals) {
return self.AddAtMostOne(literals);
})
.define_method(
"add_exactly_one",
[](CpModelBuilder& self, const std::vector<BoolVar>& literals) {
return self.AddExactlyOne(literals);
})
.define_method(
"add_implication",
[](CpModelBuilder& self, const BoolVar& a, const BoolVar& b) {
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42 changes: 42 additions & 0 deletions test/constraint_test.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -305,6 +305,48 @@ def test_sum_empty_false
assert_equal expected, model.inspect
end

def test_add_at_most_one
model = ORTools::CpModel.new
x = model.new_bool_var("x")
y = model.new_bool_var("y")
z = model.new_bool_var("z")
model.add_at_most_one([x, y, z])
model.maximize(model.sum([x, y, z]))

solver = ORTools::CpSolver.new
assert_equal :optimal, solver.solve(model)
assert_equal 1, solver.objective_value
assert_equal 1, [x, y, z].count { |v| solver.value(v) }
end

def test_add_exactly_one
model = ORTools::CpModel.new
x = model.new_bool_var("x")
y = model.new_bool_var("y")
z = model.new_bool_var("z")
model.add_exactly_one([x, y, z])
model.minimize(model.sum([x, y, z]))

solver = ORTools::CpSolver.new
assert_equal :optimal, solver.solve(model)
assert_equal 1, solver.objective_value
assert_equal 1, [x, y, z].count { |v| solver.value(v) }
end

def test_add_at_most_one_enforced
model = ORTools::CpModel.new
x = model.new_bool_var("x")
y = model.new_bool_var("y")
guard = model.new_bool_var("guard")
model.add_at_most_one([x, y]).only_enforce_if(guard)
model.add(guard == 1)
model.maximize(model.sum([x, y]))

solver = ORTools::CpSolver.new
assert_equal :optimal, solver.solve(model)
assert_equal 1, solver.objective_value
end

def test_add_not_supported
model = ORTools::CpModel.new
error = assert_raises(TypeError) do
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