| // -*- 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___UTILITY_FORWARD_H | |
| #define _LIBCPP___UTILITY_FORWARD_H | |
| #include <__config> | |
| #include <__type_traits/is_reference.h> | |
| #include <__type_traits/remove_reference.h> | |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) | |
| # pragma GCC system_header | |
| #endif | |
| _LIBCPP_BEGIN_NAMESPACE_STD | |
| template <class _Tp> | |
| [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp&& | |
| forward(_LIBCPP_LIFETIMEBOUND __libcpp_remove_reference_t<_Tp>& __t) _NOEXCEPT { | |
| return static_cast<_Tp&&>(__t); | |
| } | |
| template <class _Tp> | |
| [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp&& | |
| forward(_LIBCPP_LIFETIMEBOUND __libcpp_remove_reference_t<_Tp>&& __t) _NOEXCEPT { | |
| static_assert(!is_lvalue_reference<_Tp>::value, "cannot forward an rvalue as an lvalue"); | |
| return static_cast<_Tp&&>(__t); | |
| } | |
| _LIBCPP_END_NAMESPACE_STD | |
| #endif // _LIBCPP___UTILITY_FORWARD_H |