1fe6060f1SDimitry Andric // -*- C++ -*- 2fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 3fe6060f1SDimitry Andric // 4fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7fe6060f1SDimitry Andric // 8fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 9fe6060f1SDimitry Andric 10fe6060f1SDimitry Andric #ifndef _LIBCPP___UTILITY_FORWARD_H 11fe6060f1SDimitry Andric #define _LIBCPP___UTILITY_FORWARD_H 12fe6060f1SDimitry Andric 13fe6060f1SDimitry Andric #include <__config> 1481ad6265SDimitry Andric #include <__type_traits/is_reference.h> 1581ad6265SDimitry Andric #include <__type_traits/remove_reference.h> 16fe6060f1SDimitry Andric 17fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18fe6060f1SDimitry Andric # pragma GCC system_header 19fe6060f1SDimitry Andric #endif 20fe6060f1SDimitry Andric 21fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 22fe6060f1SDimitry Andric 23fe6060f1SDimitry Andric template <class _Tp> 24*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp&& forward(_LIBCPP_LIFETIMEBOUND __libcpp_remove_reference_t<_Tp> & __t)25bdd1243dSDimitry Andricforward(_LIBCPP_LIFETIMEBOUND __libcpp_remove_reference_t<_Tp>& __t) _NOEXCEPT { 26fe6060f1SDimitry Andric return static_cast<_Tp&&>(__t); 27fe6060f1SDimitry Andric } 28fe6060f1SDimitry Andric 29fe6060f1SDimitry Andric template <class _Tp> 30*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp&& forward(_LIBCPP_LIFETIMEBOUND __libcpp_remove_reference_t<_Tp> && __t)31bdd1243dSDimitry Andricforward(_LIBCPP_LIFETIMEBOUND __libcpp_remove_reference_t<_Tp>&& __t) _NOEXCEPT { 32fe6060f1SDimitry Andric static_assert(!is_lvalue_reference<_Tp>::value, "cannot forward an rvalue as an lvalue"); 33fe6060f1SDimitry Andric return static_cast<_Tp&&>(__t); 34fe6060f1SDimitry Andric } 35fe6060f1SDimitry Andric 36fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 37fe6060f1SDimitry Andric 38fe6060f1SDimitry Andric #endif // _LIBCPP___UTILITY_FORWARD_H 39