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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_DESTRUCTIBLE_H |
| 10 | #define _LIBCPP___TYPE_TRAITS_IS_DESTRUCTIBLE_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__type_traits/integral_constant.h> |
| 14 | #include <__type_traits/is_function.h> |
| 15 | #include <__type_traits/is_reference.h> |
| 16 | #include <__type_traits/remove_all_extents.h> |
| 17 | #include <__utility/declval.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 | #if __has_builtin(__is_destructible) |
| 26 | |
| 27 | template <class _Tp> |
| 28 | struct _LIBCPP_NO_SPECIALIZATIONS is_destructible : _BoolConstant<__is_destructible(_Tp)> {}; |
| 29 | |
| 30 | # if _LIBCPP_STD_VER >= 17 |
| 31 | template <class _Tp> |
| 32 | _LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_destructible_v = __is_destructible(_Tp); |
| 33 | # endif |
| 34 | |
| 35 | #else // __has_builtin(__is_destructible) |
| 36 | |
| 37 | // if it's a reference, return true |
| 38 | // if it's a function, return false |
| 39 | // if it's void, return false |
| 40 | // if it's an array of unknown bound, return false |
| 41 | // Otherwise, return "declval<_Up&>().~_Up()" is well-formed |
| 42 | // where _Up is remove_all_extents<_Tp>::type |
| 43 | |
| 44 | template <class> |
| 45 | struct __is_destructible_apply { |
| 46 | typedef int type; |
| 47 | }; |
| 48 | |
| 49 | template <typename _Tp> |
| 50 | struct __is_destructor_wellformed { |
| 51 | template <typename _Tp1> |
| 52 | static true_type __test(typename __is_destructible_apply<decltype(std::declval<_Tp1&>().~_Tp1())>::type); |
| 53 | |
| 54 | template <typename _Tp1> |
| 55 | static false_type __test(...); |
| 56 | |
| 57 | static const bool value = decltype(__test<_Tp>(12))::value; |
| 58 | }; |
| 59 | |
| 60 | template <class _Tp, bool> |
| 61 | struct __destructible_imp; |
| 62 | |
| 63 | template <class _Tp> |
| 64 | struct __destructible_imp<_Tp, false> |
| 65 | : integral_constant<bool, __is_destructor_wellformed<__remove_all_extents_t<_Tp> >::value> {}; |
| 66 | |
| 67 | template <class _Tp> |
| 68 | struct __destructible_imp<_Tp, true> : true_type {}; |
| 69 | |
| 70 | template <class _Tp, bool> |
| 71 | struct __destructible_false; |
| 72 | |
| 73 | template <class _Tp> |
| 74 | struct __destructible_false<_Tp, false> : __destructible_imp<_Tp, is_reference<_Tp>::value> {}; |
| 75 | |
| 76 | template <class _Tp> |
| 77 | struct __destructible_false<_Tp, true> : false_type {}; |
| 78 | |
| 79 | template <class _Tp> |
| 80 | struct is_destructible : __destructible_false<_Tp, is_function<_Tp>::value> {}; |
| 81 | |
| 82 | template <class _Tp> |
| 83 | struct is_destructible<_Tp[]> : false_type {}; |
| 84 | |
| 85 | template <> |
| 86 | struct is_destructible<void> : false_type {}; |
| 87 | |
| 88 | # if _LIBCPP_STD_VER >= 17 |
| 89 | template <class _Tp> |
| 90 | inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; |
| 91 | # endif |
| 92 | |
| 93 | #endif // __has_builtin(__is_destructible) |
| 94 | |
| 95 | _LIBCPP_END_NAMESPACE_STD |
| 96 | |
| 97 | #endif // _LIBCPP___TYPE_TRAITS_IS_DESTRUCTIBLE_H |
| 98 |
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