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Diffstat (limited to 'absl/strings/has_ostream_operator_test.cc')
-rw-r--r-- | absl/strings/has_ostream_operator_test.cc | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/absl/strings/has_ostream_operator_test.cc b/absl/strings/has_ostream_operator_test.cc new file mode 100644 index 00000000..9ef41366 --- /dev/null +++ b/absl/strings/has_ostream_operator_test.cc @@ -0,0 +1,41 @@ +// Copyright 2023 The Abseil Authors +// +// 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 +// +// https://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. + +#include "absl/strings/has_ostream_operator.h" + +#include <ostream> +#include <string> + +#include "gtest/gtest.h" +#include "absl/types/optional.h" + +namespace { + +struct TypeWithoutOstreamOp {}; + +struct TypeWithOstreamOp { + friend std::ostream& operator<<(std::ostream& os, const TypeWithOstreamOp&) { + return os; + } +}; + +TEST(HasOstreamOperatorTest, Works) { + EXPECT_TRUE(absl::HasOstreamOperator<int>::value); + EXPECT_TRUE(absl::HasOstreamOperator<std::string>::value); + EXPECT_FALSE(absl::HasOstreamOperator<absl::optional<int>>::value); + EXPECT_FALSE(absl::HasOstreamOperator<TypeWithoutOstreamOp>::value); + EXPECT_TRUE(absl::HasOstreamOperator<TypeWithOstreamOp>::value); +} + +} // namespace |