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___UTILITY_MOVE_H 11 #define _LIBCPP___UTILITY_MOVE_H 12 13 #include <__config> 14 #include <__type_traits/conditional.h> 15 #include <__type_traits/is_copy_constructible.h> 16 #include <__type_traits/is_nothrow_move_constructible.h> 17 #include <__type_traits/remove_reference.h> 18 19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20 # pragma GCC system_header 21 #endif 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 template <class _Tp> 26 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __libcpp_remove_reference_t<_Tp>&& move(_LIBCPP_LIFETIMEBOUND _Tp && __t)27move(_LIBCPP_LIFETIMEBOUND _Tp&& __t) _NOEXCEPT { 28 typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tp> _Up; 29 return static_cast<_Up&&>(__t); 30 } 31 32 template <class _Tp> 33 using __move_if_noexcept_result_t = 34 __conditional_t<!is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value, const _Tp&, _Tp&&>; 35 36 template <class _Tp> 37 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __move_if_noexcept_result_t<_Tp> move_if_noexcept(_LIBCPP_LIFETIMEBOUND _Tp & __x)38move_if_noexcept(_LIBCPP_LIFETIMEBOUND _Tp& __x) _NOEXCEPT { 39 return std::move(__x); 40 } 41 42 _LIBCPP_END_NAMESPACE_STD 43 44 #endif // _LIBCPP___UTILITY_MOVE_H 45