Abseil Common Libraries (C++) (grcp 依赖)
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48 lines
1.4 KiB
48 lines
1.4 KiB
// Copyright 2018 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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// 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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#ifndef ABSL_CONTAINER_INTERNAL_CONTAINER_H_ |
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#define ABSL_CONTAINER_INTERNAL_CONTAINER_H_ |
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#include <type_traits> |
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#include "absl/meta/type_traits.h" |
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namespace absl { |
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namespace container_internal { |
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template <class, class = void> |
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struct IsTransparent : std::false_type {}; |
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template <class T> |
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struct IsTransparent<T, absl::void_t<typename T::is_transparent>> |
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: std::true_type {}; |
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template <bool is_transparent> |
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struct KeyArg { |
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// Transparent. Forward `K`. |
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template <typename K, typename key_type> |
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using type = K; |
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}; |
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template <> |
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struct KeyArg<false> { |
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// Not transparent. Always use `key_type`. |
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template <typename K, typename key_type> |
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using type = key_type; |
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}; |
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} // namespace container_internal |
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} // namespace absl |
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#endif // ABSL_CONTAINER_INTERNAL_CONTAINER_H_
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