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| 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_IS_SWAPPABLE_H |
| 10 | #define _LIBCPP___TYPE_TRAITS_IS_SWAPPABLE_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__cstddef/size_t.h> |
| 14 | #include <__type_traits/add_lvalue_reference.h> |
| 15 | #include <__type_traits/enable_if.h> |
| 16 | #include <__type_traits/integral_constant.h> |
| 17 | #include <__type_traits/is_assignable.h> |
| 18 | #include <__type_traits/is_constructible.h> |
| 19 | #include <__type_traits/is_nothrow_assignable.h> |
| 20 | #include <__type_traits/is_nothrow_constructible.h> |
| 21 | #include <__type_traits/void_t.h> |
| 22 | #include <__utility/declval.h> |
| 23 | |
| 24 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 25 | # pragma GCC system_header |
| 26 | #endif |
| 27 | |
| 28 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 29 | |
| 30 | template <class _Tp, class _Up, class = void> |
| 31 | inline const bool __is_swappable_with_v = false; |
| 32 | |
| 33 | template <class _Tp> |
| 34 | inline const bool __is_swappable_v = __is_swappable_with_v<_Tp&, _Tp&>; |
| 35 | |
| 36 | template <class _Tp, class _Up, bool = __is_swappable_with_v<_Tp, _Up> > |
| 37 | inline const bool __is_nothrow_swappable_with_v = false; |
| 38 | |
| 39 | template <class _Tp> |
| 40 | inline const bool __is_nothrow_swappable_v = __is_nothrow_swappable_with_v<_Tp&, _Tp&>; |
| 41 | |
| 42 | #ifndef _LIBCPP_CXX03_LANG |
| 43 | template <class _Tp> |
| 44 | using __swap_result_t _LIBCPP_NODEBUG = |
| 45 | __enable_if_t<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>; |
| 46 | #else |
| 47 | template <class> |
| 48 | using __swap_result_t _LIBCPP_NODEBUG = void; |
| 49 | #endif |
| 50 | |
| 51 | template <class _Tp> |
| 52 | inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __swap_result_t<_Tp> swap(_Tp& __x, _Tp& __y) |
| 53 | _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value&& is_nothrow_move_assignable<_Tp>::value); |
| 54 | |
| 55 | template <class _Tp, size_t _Np, __enable_if_t<__is_swappable_v<_Tp>, int> = 0> |
| 56 | inline _LIBCPP_HIDE_FROM_ABI |
| 57 | _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable_v<_Tp>); |
| 58 | |
| 59 | // ALL generic swap overloads MUST already have a declaration available at this point. |
| 60 | |
| 61 | template <class _Tp, class _Up> |
| 62 | inline const bool __is_swappable_with_v<_Tp, |
| 63 | _Up, |
| 64 | __void_t<decltype(swap(std::declval<_Tp>(), std::declval<_Up>())), |
| 65 | decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))> > = true; |
| 66 | |
| 67 | #ifndef _LIBCPP_CXX03_LANG // C++03 doesn't have noexcept, so things are never nothrow swappable |
| 68 | template <class _Tp, class _Up> |
| 69 | inline const bool __is_nothrow_swappable_with_v<_Tp, _Up, true> = |
| 70 | noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())) && |
| 71 | noexcept(swap(std::declval<_Up>(), std::declval<_Tp>())); |
| 72 | #endif |
| 73 | |
| 74 | #if _LIBCPP_STD_VER >= 17 |
| 75 | |
| 76 | template <class _Tp, class _Up> |
| 77 | _LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_swappable_with_v = __is_swappable_with_v<_Tp, _Up>; |
| 78 | |
| 79 | template <class _Tp, class _Up> |
| 80 | struct _LIBCPP_NO_SPECIALIZATIONS is_swappable_with : bool_constant<is_swappable_with_v<_Tp, _Up>> {}; |
| 81 | |
| 82 | template <class _Tp> |
| 83 | _LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_swappable_v = |
| 84 | is_swappable_with_v<__add_lvalue_reference_t<_Tp>, __add_lvalue_reference_t<_Tp>>; |
| 85 | |
| 86 | template <class _Tp> |
| 87 | struct _LIBCPP_NO_SPECIALIZATIONS is_swappable : bool_constant<is_swappable_v<_Tp>> {}; |
| 88 | |
| 89 | template <class _Tp, class _Up> |
| 90 | _LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_nothrow_swappable_with_v = __is_nothrow_swappable_with_v<_Tp, _Up>; |
| 91 | |
| 92 | template <class _Tp, class _Up> |
| 93 | struct _LIBCPP_NO_SPECIALIZATIONS is_nothrow_swappable_with : bool_constant<is_nothrow_swappable_with_v<_Tp, _Up>> {}; |
| 94 | |
| 95 | template <class _Tp> |
| 96 | _LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_nothrow_swappable_v = |
| 97 | is_nothrow_swappable_with_v<__add_lvalue_reference_t<_Tp>, __add_lvalue_reference_t<_Tp>>; |
| 98 | |
| 99 | template <class _Tp> |
| 100 | struct _LIBCPP_NO_SPECIALIZATIONS is_nothrow_swappable : bool_constant<is_nothrow_swappable_v<_Tp>> {}; |
| 101 | |
| 102 | #endif // _LIBCPP_STD_VER >= 17 |
| 103 | |
| 104 | _LIBCPP_END_NAMESPACE_STD |
| 105 | |
| 106 | #endif // _LIBCPP___TYPE_TRAITS_IS_SWAPPABLE_H |
| 107 |
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