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_PUSH_MACROS 21 #include <__undef_macros> 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 template <class _Tp> 26 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR typename remove_reference<_Tp>::type&& 27 move(_Tp&& __t) _NOEXCEPT { 28 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up; 29 return static_cast<_Up&&>(__t); 30 } 31 32 #ifndef _LIBCPP_CXX03_LANG 33 template <class _Tp> 34 using __move_if_noexcept_result_t = 35 typename conditional<!is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value, const _Tp&, 36 _Tp&&>::type; 37 #else // _LIBCPP_CXX03_LANG 38 template <class _Tp> 39 using __move_if_noexcept_result_t = const _Tp&; 40 #endif 41 42 template <class _Tp> 43 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 __move_if_noexcept_result_t<_Tp> 44 move_if_noexcept(_Tp& __x) _NOEXCEPT { 45 return _VSTD::move(__x); 46 } 47 48 _LIBCPP_END_NAMESPACE_STD 49 50 _LIBCPP_POP_MACROS 51 52 #endif // _LIBCPP___UTILITY_MOVE_H 53