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