Abseil Common Libraries (C++) (grcp 依赖)
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55 lines
1.7 KiB
55 lines
1.7 KiB
// Copyright 2022 The Abseil Authors |
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// |
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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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// https://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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#ifndef ABSL_STRINGS_INTERNAL_HAS_ABSL_STRINGIFY_H_ |
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#define ABSL_STRINGS_INTERNAL_HAS_ABSL_STRINGIFY_H_ |
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#include <string> |
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#include <type_traits> |
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#include <utility> |
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#include "absl/strings/string_view.h" |
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namespace absl { |
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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 |
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// `HasAbslStringify` can reference a universal class rather than needing to be |
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// copied for each new sink. |
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class UnimplementedSink { |
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public: |
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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...)`. |
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friend void AbslFormatFlush(UnimplementedSink* sink, absl::string_view v); |
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}; |
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template <typename T, typename = void> |
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struct HasAbslStringify : std::false_type {}; |
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template <typename T> |
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struct HasAbslStringify< |
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T, std::enable_if_t<std::is_void<decltype(AbslStringify( |
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std::declval<strings_internal::UnimplementedSink&>(), |
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std::declval<const T&>()))>::value>> : std::true_type {}; |
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} // namespace strings_internal |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_STRINGS_INTERNAL_HAS_ABSL_STRINGIFY_H_
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