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_NOTHROW_DESTRUCTIBLE_H 10 #define _LIBCPP___TYPE_TRAITS_IS_NOTHROW_DESTRUCTIBLE_H 11 12 #include <__config> 13 #include <__type_traits/integral_constant.h> 14 #include <__type_traits/is_destructible.h> 15 #include <__utility/declval.h> 16 #include <cstddef> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 #if __has_builtin(__is_nothrow_destructible) 25 26 template <class _Tp> 27 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible : integral_constant<bool, __is_nothrow_destructible(_Tp)> {}; 28 29 #else 30 31 template <bool, class _Tp> 32 struct __libcpp_is_nothrow_destructible; 33 34 template <class _Tp> 35 struct __libcpp_is_nothrow_destructible<false, _Tp> : public false_type {}; 36 37 template <class _Tp> 38 struct __libcpp_is_nothrow_destructible<true, _Tp> 39 : public integral_constant<bool, noexcept(std::declval<_Tp>().~_Tp()) > {}; 40 41 template <class _Tp> 42 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 43 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> {}; 44 45 template <class _Tp, size_t _Ns> 46 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> : public is_nothrow_destructible<_Tp> {}; 47 48 template <class _Tp> 49 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> : public true_type {}; 50 51 template <class _Tp> 52 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> : public true_type {}; 53 54 #endif // __has_builtin(__is_nothrow_destructible) 55 56 #if _LIBCPP_STD_VER >= 17 57 template <class _Tp> 58 inline constexpr bool is_nothrow_destructible_v = is_nothrow_destructible<_Tp>::value; 59 #endif 60 61 _LIBCPP_END_NAMESPACE_STD 62 63 #endif // _LIBCPP___TYPE_TRAITS_IS_NOTHROW_DESTRUCTIBLE_H 64