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_VOLATILE_H
10#define _LIBCPP___TYPE_TRAITS_IS_VOLATILE_H
11
12#include <__config>
13#include <__type_traits/integral_constant.h>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16#  pragma GCC system_header
17#endif
18
19_LIBCPP_BEGIN_NAMESPACE_STD
20
21#if __has_builtin(__is_volatile)
22
23template <class _Tp>
24struct _LIBCPP_TEMPLATE_VIS is_volatile : _BoolConstant<__is_volatile(_Tp)> {};
25
26#  if _LIBCPP_STD_VER >= 17
27template <class _Tp>
28inline constexpr bool is_volatile_v = __is_volatile(_Tp);
29#  endif
30
31#else
32
33template <class _Tp>
34struct _LIBCPP_TEMPLATE_VIS is_volatile : public false_type {};
35template <class _Tp>
36struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {};
37
38#  if _LIBCPP_STD_VER >= 17
39template <class _Tp>
40inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
41#  endif
42
43#endif // __has_builtin(__is_volatile)
44
45_LIBCPP_END_NAMESPACE_STD
46
47#endif // _LIBCPP___TYPE_TRAITS_IS_VOLATILE_H
48