1*fe6060f1SDimitry Andric // -*- C++ -*- 2*fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 3*fe6060f1SDimitry Andric // 4*fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5*fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6*fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7*fe6060f1SDimitry Andric // 8*fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 9*fe6060f1SDimitry Andric 10*fe6060f1SDimitry Andric #ifndef _LIBCPP___FUNCTIONAL_IDENTITY_H 11*fe6060f1SDimitry Andric #define _LIBCPP___FUNCTIONAL_IDENTITY_H 12*fe6060f1SDimitry Andric 13*fe6060f1SDimitry Andric #include <__config> 14*fe6060f1SDimitry Andric #include <utility> 15*fe6060f1SDimitry Andric 16*fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17*fe6060f1SDimitry Andric #pragma GCC system_header 18*fe6060f1SDimitry Andric #endif 19*fe6060f1SDimitry Andric 20*fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 21*fe6060f1SDimitry Andric 22*fe6060f1SDimitry Andric #if _LIBCPP_STD_VER > 17 23*fe6060f1SDimitry Andric 24*fe6060f1SDimitry Andric struct identity { 25*fe6060f1SDimitry Andric template<class _Tp> 26*fe6060f1SDimitry Andric _LIBCPP_NODISCARD_EXT constexpr _Tp&& operator()(_Tp&& __t) const noexcept 27*fe6060f1SDimitry Andric { 28*fe6060f1SDimitry Andric return _VSTD::forward<_Tp>(__t); 29*fe6060f1SDimitry Andric } 30*fe6060f1SDimitry Andric 31*fe6060f1SDimitry Andric using is_transparent = void; 32*fe6060f1SDimitry Andric }; 33*fe6060f1SDimitry Andric #endif // _LIBCPP_STD_VER > 17 34*fe6060f1SDimitry Andric 35*fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 36*fe6060f1SDimitry Andric 37*fe6060f1SDimitry Andric #endif // _LIBCPP___FUNCTIONAL_IDENTITY_H 38