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_CONST_H 10#define _LIBCPP___TYPE_TRAITS_IS_CONST_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_const) 22 23template <class _Tp> 24struct _LIBCPP_TEMPLATE_VIS is_const : _BoolConstant<__is_const(_Tp)> { }; 25 26#if _LIBCPP_STD_VER > 14 27template <class _Tp> 28inline constexpr bool is_const_v = __is_const(_Tp); 29#endif 30 31#else 32 33template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const : public false_type {}; 34template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {}; 35 36#if _LIBCPP_STD_VER > 14 37template <class _Tp> 38inline constexpr bool is_const_v = is_const<_Tp>::value; 39#endif 40 41#endif // __has_builtin(__is_const) 42 43_LIBCPP_END_NAMESPACE_STD 44 45#endif // _LIBCPP___TYPE_TRAITS_IS_CONST_H 46