| // Copyright 2020 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_FUNCTIONAL_IDENTITY_H_ |
| #define BASE_FUNCTIONAL_IDENTITY_H_ |
| |
| #include <utility> |
| |
| namespace gurl_base { |
| |
| // Implementation of C++20's std::identity. |
| // |
| // Reference: |
| // - https://en.cppreference.com/w/cpp/utility/functional/identity |
| // - https://wg21.link/func.identity |
| struct identity { |
| template <typename T> |
| constexpr T&& operator()(T&& t) const noexcept { |
| return std::forward<T>(t); |
| } |
| |
| using is_transparent = void; |
| }; |
| |
| } // namespace base |
| |
| #endif // BASE_FUNCTIONAL_IDENTITY_H_ |