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| 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 | |
| 23 | template <class _Tp> |
| 24 | struct _LIBCPP_NO_SPECIALIZATIONS is_const : _BoolConstant<__is_const(_Tp)> {}; |
| 25 | |
| 26 | # if _LIBCPP_STD_VER >= 17 |
| 27 | template <class _Tp> |
| 28 | _LIBCPP_NO_SPECIALIZATIONS inline constexpr bool is_const_v = __is_const(_Tp); |
| 29 | # endif |
| 30 | |
| 31 | #else |
| 32 | |
| 33 | template <class _Tp> |
| 34 | struct is_const : public false_type {}; |
| 35 | template <class _Tp> |
| 36 | struct is_const<_Tp const> : public true_type {}; |
| 37 | |
| 38 | # if _LIBCPP_STD_VER >= 17 |
| 39 | template <class _Tp> |
| 40 | inline constexpr bool is_const_v = is_const<_Tp>::value; |
| 41 | # endif |
| 42 | |
| 43 | #endif // __has_builtin(__is_const) |
| 44 | |
| 45 | _LIBCPP_END_NAMESPACE_STD |
| 46 | |
| 47 | #endif // _LIBCPP___TYPE_TRAITS_IS_CONST_H |
| 48 |
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