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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___CXX03___FUNCTIONAL_IDENTITY_H |
| 11 | #define _LIBCPP___CXX03___FUNCTIONAL_IDENTITY_H |
| 12 | |
| 13 | #include <__cxx03/__config> |
| 14 | #include <__cxx03/__fwd/functional.h> |
| 15 | #include <__cxx03/__type_traits/integral_constant.h> |
| 16 | #include <__cxx03/__utility/forward.h> |
| 17 | |
| 18 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 19 | # pragma GCC system_header |
| 20 | #endif |
| 21 | |
| 22 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 23 | |
| 24 | template <class _Tp> |
| 25 | struct __is_identity : false_type {}; |
| 26 | |
| 27 | struct __identity { |
| 28 | template <class _Tp> |
| 29 | _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _Tp&& operator()(_Tp&& __t) const _NOEXCEPT { |
| 30 | return std::forward<_Tp>(__t); |
| 31 | } |
| 32 | |
| 33 | using is_transparent = void; |
| 34 | }; |
| 35 | |
| 36 | template <> |
| 37 | struct __is_identity<__identity> : true_type {}; |
| 38 | template <> |
| 39 | struct __is_identity<reference_wrapper<__identity> > : true_type {}; |
| 40 | template <> |
| 41 | struct __is_identity<reference_wrapper<const __identity> > : true_type {}; |
| 42 | |
| 43 | _LIBCPP_END_NAMESPACE_STD |
| 44 | |
| 45 | #endif // _LIBCPP___CXX03___FUNCTIONAL_IDENTITY_H |
| 46 |
Warning: This file is not a C or C++ file. It does not have highlighting.