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// Copyright 2022 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. | ||
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#ifndef ABSL_STRINGS_HAS_ABSL_STRINGIFY_H_ | ||
#define ABSL_STRINGS_HAS_ABSL_STRINGIFY_H_ | ||
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#include <type_traits> | ||
#include <utility> | ||
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#include "absl/strings/string_view.h" | ||
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namespace absl { | ||
ABSL_NAMESPACE_BEGIN | ||
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namespace strings_internal { | ||
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// This is an empty class not intended to be used. It exists so that | ||
// `HasAbslStringify` can reference a universal class rather than needing to be | ||
// copied for each new sink. | ||
class UnimplementedSink { | ||
public: | ||
void Append(size_t count, char ch); | ||
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void Append(string_view v); | ||
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// Support `absl::Format(&sink, format, args...)`. | ||
friend void AbslFormatFlush(UnimplementedSink* sink, absl::string_view v); | ||
}; | ||
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} // namespace strings_internal | ||
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// `HasAbslStringify<T>` detects if type `T` supports the `AbslStringify()` | ||
// customization point (see | ||
// https://abseil.io/docs/cpp/guides/format#abslstringify for the | ||
// documentation). | ||
// | ||
// Note that there are types that can be `StrCat`-ed that do not use the | ||
// `AbslStringify` customization point (for example, `int`). | ||
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template <typename T, typename = void> | ||
struct HasAbslStringify : std::false_type {}; | ||
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template <typename T> | ||
struct HasAbslStringify< | ||
T, std::enable_if_t<std::is_void<decltype(AbslStringify( | ||
std::declval<strings_internal::UnimplementedSink&>(), | ||
std::declval<const T&>()))>::value>> : std::true_type {}; | ||
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ABSL_NAMESPACE_END | ||
} // namespace absl | ||
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#endif // ABSL_STRINGS_HAS_ABSL_STRINGIFY_H_ |
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// 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. | ||
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#include "absl/strings/has_absl_stringify.h" | ||
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#include <string> | ||
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#include "gtest/gtest.h" | ||
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namespace { | ||
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struct TypeWithoutAbslStringify {}; | ||
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struct TypeWithAbslStringify { | ||
template <typename Sink> | ||
friend void AbslStringify(Sink&, const TypeWithAbslStringify&) {} | ||
}; | ||
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TEST(HasAbslStringifyTest, Works) { | ||
EXPECT_FALSE(absl::HasAbslStringify<int>::value); | ||
EXPECT_FALSE(absl::HasAbslStringify<std::string>::value); | ||
EXPECT_FALSE(absl::HasAbslStringify<TypeWithoutAbslStringify>::value); | ||
EXPECT_TRUE(absl::HasAbslStringify<TypeWithAbslStringify>::value); | ||
} | ||
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} // namespace |
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