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> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 _LIBCPP_BEGIN_NAMESPACE_STD 21 22 template <class _Tp> 23 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR typename remove_reference<_Tp>::type&& 24 move(_Tp&& __t) _NOEXCEPT { 25 typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type _Up; 26 return static_cast<_Up&&>(__t); 27 } 28 29 template <class _Tp> 30 using __move_if_noexcept_result_t = 31 typename conditional<!is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value, const _Tp&, 32 _Tp&&>::type; 33 34 template <class _Tp> 35 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 __move_if_noexcept_result_t<_Tp> 36 move_if_noexcept(_Tp& __x) _NOEXCEPT { 37 return _VSTD::move(__x); 38 } 39 40 _LIBCPP_END_NAMESPACE_STD 41 42 #endif // _LIBCPP___UTILITY_MOVE_H 43