| // -*- C++ -*- | |
| //===----------------------------------------------------------------------===// | |
| // | |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |
| // See https://llvm.org/LICENSE.txt for license information. | |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |
| // | |
| //===----------------------------------------------------------------------===// | |
| #ifndef _LIBCPP___FUNCTIONAL_IDENTITY_H | |
| #define _LIBCPP___FUNCTIONAL_IDENTITY_H | |
| #include <__config> | |
| #include <utility> | |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) | |
| #pragma GCC system_header | |
| #endif | |
| _LIBCPP_BEGIN_NAMESPACE_STD | |
| #if _LIBCPP_STD_VER > 17 | |
| struct identity { | |
| template<class _Tp> | |
| _LIBCPP_NODISCARD_EXT constexpr _Tp&& operator()(_Tp&& __t) const noexcept | |
| { | |
| return _VSTD::forward<_Tp>(__t); | |
| } | |
| using is_transparent = void; | |
| }; | |
| #endif // _LIBCPP_STD_VER > 17 | |
| _LIBCPP_END_NAMESPACE_STD | |
| #endif // _LIBCPP___FUNCTIONAL_IDENTITY_H |