1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___TYPE_TRAITS_ADD_REFERENCE_H 10 #define _LIBCPP___TYPE_TRAITS_ADD_REFERENCE_H 11 12 #include <__config> 13 #include <__type_traits/is_referenceable.h> 14 15 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 16 # pragma GCC system_header 17 #endif 18 19 _LIBCPP_BEGIN_NAMESPACE_STD 20 21 #if __has_builtin(__add_lvalue_reference) && !defined(_LIBCPP_COMPILER_GCC) 22 23 template <class _Tp> 24 using __add_lvalue_reference_t _LIBCPP_NODEBUG = __add_lvalue_reference(_Tp); 25 26 #else 27 28 template <class _Tp, bool = __is_referenceable_v<_Tp>> 29 struct __add_lvalue_reference_impl { 30 using type _LIBCPP_NODEBUG = _Tp; 31 }; 32 template <class _Tp > 33 struct __add_lvalue_reference_impl<_Tp, true> { 34 using type _LIBCPP_NODEBUG = _Tp&; 35 }; 36 37 template <class _Tp> 38 using __add_lvalue_reference_t = typename __add_lvalue_reference_impl<_Tp>::type; 39 40 #endif // __has_builtin(__add_lvalue_reference) 41 42 template <class _Tp> 43 struct _LIBCPP_NO_SPECIALIZATIONS add_lvalue_reference { 44 using type _LIBCPP_NODEBUG = __add_lvalue_reference_t<_Tp>; 45 }; 46 47 #if _LIBCPP_STD_VER >= 14 48 template <class _Tp> 49 using add_lvalue_reference_t = __add_lvalue_reference_t<_Tp>; 50 #endif 51 52 #if __has_builtin(__add_rvalue_reference) && !defined(_LIBCPP_COMPILER_GCC) 53 54 template <class _Tp> 55 using __add_rvalue_reference_t _LIBCPP_NODEBUG = __add_rvalue_reference(_Tp); 56 57 #else 58 59 template <class _Tp, bool = __is_referenceable_v<_Tp> > 60 struct __add_rvalue_reference_impl { 61 using type _LIBCPP_NODEBUG = _Tp; 62 }; 63 template <class _Tp > 64 struct __add_rvalue_reference_impl<_Tp, true> { 65 using type _LIBCPP_NODEBUG = _Tp&&; 66 }; 67 68 template <class _Tp> 69 using __add_rvalue_reference_t = typename __add_rvalue_reference_impl<_Tp>::type; 70 71 #endif // __has_builtin(__add_rvalue_reference) 72 73 template <class _Tp> 74 struct _LIBCPP_NO_SPECIALIZATIONS add_rvalue_reference { 75 using type _LIBCPP_NODEBUG = __add_rvalue_reference_t<_Tp>; 76 }; 77 78 #if _LIBCPP_STD_VER >= 14 79 template <class _Tp> 80 using add_rvalue_reference_t = __add_rvalue_reference_t<_Tp>; 81 #endif 82 83 _LIBCPP_END_NAMESPACE_STD 84 85 #endif // _LIBCPP___TYPE_TRAITS_ADD_REFERENCE_H 86