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// Copyright 2020 The Chromium Authors. All rights reserved.
// 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 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_
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