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 <__type_traits/is_reference.h>
16 #include <__type_traits/is_scalar.h>
17 #include <__type_traits/remove_all_extents.h>
18 #include <__utility/declval.h>
19 #include <cstddef>
20 
21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22 #  pragma GCC system_header
23 #endif
24 
25 _LIBCPP_BEGIN_NAMESPACE_STD
26 
27 #if !defined(_LIBCPP_CXX03_LANG)
28 
29 template <bool, class _Tp> struct __libcpp_is_nothrow_destructible;
30 
31 template <class _Tp>
32 struct __libcpp_is_nothrow_destructible<false, _Tp>
33     : public false_type
34 {
35 };
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 };
42 
43 template <class _Tp>
44 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible
45     : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp>
46 {
47 };
48 
49 template <class _Tp, size_t _Ns>
50 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]>
51     : public is_nothrow_destructible<_Tp>
52 {
53 };
54 
55 template <class _Tp>
56 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&>
57     : public true_type
58 {
59 };
60 
61 template <class _Tp>
62 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&>
63     : public true_type
64 {
65 };
66 
67 #else
68 
69 template <class _Tp> struct __libcpp_nothrow_destructor
70     : public integral_constant<bool, is_scalar<_Tp>::value ||
71                                      is_reference<_Tp>::value> {};
72 
73 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible
74     : public __libcpp_nothrow_destructor<__remove_all_extents_t<_Tp> > {};
75 
76 template <class _Tp>
77 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]>
78     : public false_type {};
79 
80 #endif
81 
82 #if _LIBCPP_STD_VER > 14
83 template <class _Tp>
84 inline constexpr bool is_nothrow_destructible_v = is_nothrow_destructible<_Tp>::value;
85 #endif
86 
87 _LIBCPP_END_NAMESPACE_STD
88 
89 #endif // _LIBCPP___TYPE_TRAITS_IS_NOTHROW_DESTRUCTIBLE_H
90