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_SCOPED_ENUM_H 10#define _LIBCPP___TYPE_TRAITS_IS_SCOPED_ENUM_H 11 12#include <__config> 13#include <__type_traits/integral_constant.h> 14#include <__type_traits/is_convertible.h> 15#include <__type_traits/is_enum.h> 16#include <__type_traits/underlying_type.h> 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 _LIBCPP_STD_VER > 20 25template <class _Tp, bool = is_enum_v<_Tp> > 26struct __is_scoped_enum_helper : false_type {}; 27 28template <class _Tp> 29struct __is_scoped_enum_helper<_Tp, true> 30 : public bool_constant<!is_convertible_v<_Tp, underlying_type_t<_Tp> > > {}; 31 32template <class _Tp> 33struct _LIBCPP_TEMPLATE_VIS is_scoped_enum 34 : public __is_scoped_enum_helper<_Tp> {}; 35 36template <class _Tp> 37inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; 38#endif 39 40_LIBCPP_END_NAMESPACE_STD 41 42#endif // _LIBCPP___TYPE_TRAITS_IS_SCOPED_ENUM_H 43