diff options
Diffstat (limited to 'third_party/libwebrtc/rtc_base/containers/identity.h')
-rw-r--r-- | third_party/libwebrtc/rtc_base/containers/identity.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/containers/identity.h b/third_party/libwebrtc/rtc_base/containers/identity.h new file mode 100644 index 0000000000..29592931bd --- /dev/null +++ b/third_party/libwebrtc/rtc_base/containers/identity.h @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2021 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +// This implementation is borrowed from Chromium. + +#ifndef RTC_BASE_CONTAINERS_IDENTITY_H_ +#define RTC_BASE_CONTAINERS_IDENTITY_H_ + +#include <utility> + +namespace webrtc { + +// 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 webrtc + +#endif // RTC_BASE_CONTAINERS_IDENTITY_H_ |