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>
30 struct __libcpp_is_nothrow_destructible;
31 
32 template <class _Tp>
33 struct __libcpp_is_nothrow_destructible<false, _Tp> : public false_type {};
34 
35 template <class _Tp>
36 struct __libcpp_is_nothrow_destructible<true, _Tp>
37     : public integral_constant<bool, noexcept(std::declval<_Tp>().~_Tp()) > {};
38 
39 template <class _Tp>
40 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible
41     : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> {};
42 
43 template <class _Tp, size_t _Ns>
44 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> : public is_nothrow_destructible<_Tp> {};
45 
46 template <class _Tp>
47 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> : public true_type {};
48 
49 template <class _Tp>
50 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> : public true_type {};
51 
52 #else
53 
54 template <class _Tp>
55 struct __libcpp_nothrow_destructor : public integral_constant<bool, is_scalar<_Tp>::value || is_reference<_Tp>::value> {
56 };
57 
58 template <class _Tp>
59 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible : public __libcpp_nothrow_destructor<__remove_all_extents_t<_Tp> > {
60 };
61 
62 template <class _Tp>
63 struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> : public false_type {};
64 
65 #endif
66 
67 #if _LIBCPP_STD_VER >= 17
68 template <class _Tp>
69 inline constexpr bool is_nothrow_destructible_v = is_nothrow_destructible<_Tp>::value;
70 #endif
71 
72 _LIBCPP_END_NAMESPACE_STD
73 
74 #endif // _LIBCPP___TYPE_TRAITS_IS_NOTHROW_DESTRUCTIBLE_H
75