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