181ad6265SDimitry Andric //===----------------------------------------------------------------------===//
281ad6265SDimitry Andric //
381ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
481ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
581ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
681ad6265SDimitry Andric //
781ad6265SDimitry Andric //===----------------------------------------------------------------------===//
881ad6265SDimitry Andric 
981ad6265SDimitry Andric #ifndef _LIBCPP___TYPE_TRAITS_IS_CONST_H
1081ad6265SDimitry Andric #define _LIBCPP___TYPE_TRAITS_IS_CONST_H
1181ad6265SDimitry Andric 
1281ad6265SDimitry Andric #include <__config>
1381ad6265SDimitry Andric #include <__type_traits/integral_constant.h>
1481ad6265SDimitry Andric 
1581ad6265SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
1681ad6265SDimitry Andric #  pragma GCC system_header
1781ad6265SDimitry Andric #endif
1881ad6265SDimitry Andric 
1981ad6265SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD
2081ad6265SDimitry Andric 
21753f127fSDimitry Andric #if __has_builtin(__is_const)
2281ad6265SDimitry Andric 
2381ad6265SDimitry Andric template <class _Tp>
2481ad6265SDimitry Andric struct _LIBCPP_TEMPLATE_VIS is_const : _BoolConstant<__is_const(_Tp)> {};
2581ad6265SDimitry Andric 
26*06c3fb27SDimitry Andric #  if _LIBCPP_STD_VER >= 17
2781ad6265SDimitry Andric template <class _Tp>
2881ad6265SDimitry Andric inline constexpr bool is_const_v = __is_const(_Tp);
2981ad6265SDimitry Andric #  endif
3081ad6265SDimitry Andric 
3181ad6265SDimitry Andric #else
3281ad6265SDimitry Andric 
33*06c3fb27SDimitry Andric template <class _Tp>
34*06c3fb27SDimitry Andric struct _LIBCPP_TEMPLATE_VIS is_const : public false_type {};
35*06c3fb27SDimitry Andric template <class _Tp>
36*06c3fb27SDimitry Andric struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {};
3781ad6265SDimitry Andric 
38*06c3fb27SDimitry Andric #  if _LIBCPP_STD_VER >= 17
3981ad6265SDimitry Andric template <class _Tp>
4081ad6265SDimitry Andric inline constexpr bool is_const_v = is_const<_Tp>::value;
4181ad6265SDimitry Andric #  endif
4281ad6265SDimitry Andric 
43753f127fSDimitry Andric #endif // __has_builtin(__is_const)
4481ad6265SDimitry Andric 
4581ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD
4681ad6265SDimitry Andric 
4781ad6265SDimitry Andric #endif // _LIBCPP___TYPE_TRAITS_IS_CONST_H
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