| 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_INTEGRAL_CONSTANT_H |
| 10 | #define _LIBCPP___TYPE_TRAITS_INTEGRAL_CONSTANT_H |
| 11 | |
| 12 | #include <__config> |
| 13 | |
| 14 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 15 | # pragma GCC system_header |
| 16 | #endif |
| 17 | |
| 18 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 19 | |
| 20 | template <class _Tp, _Tp __v> |
| 21 | struct _LIBCPP_TEMPLATE_VIS integral_constant |
| 22 | { |
| 23 | static _LIBCPP_CONSTEXPR const _Tp value = __v; |
| 24 | typedef _Tp value_type; |
| 25 | typedef integral_constant type; |
| 26 | _LIBCPP_INLINE_VISIBILITY |
| 27 | _LIBCPP_CONSTEXPR operator value_type() const _NOEXCEPT {return value;} |
| 28 | #if _LIBCPP_STD_VER > 11 |
| 29 | _LIBCPP_INLINE_VISIBILITY |
| 30 | constexpr value_type operator ()() const _NOEXCEPT {return value;} |
| 31 | #endif |
| 32 | }; |
| 33 | |
| 34 | template <class _Tp, _Tp __v> |
| 35 | _LIBCPP_CONSTEXPR const _Tp integral_constant<_Tp, __v>::value; |
| 36 | |
| 37 | typedef integral_constant<bool, true> true_type; |
| 38 | typedef integral_constant<bool, false> false_type; |
| 39 | |
| 40 | template <bool _Val> |
| 41 | using _BoolConstant _LIBCPP_NODEBUG = integral_constant<bool, _Val>; |
| 42 | |
| 43 | #if _LIBCPP_STD_VER > 14 |
| 44 | template <bool __b> |
| 45 | using bool_constant = integral_constant<bool, __b>; |
| 46 | #endif |
| 47 | |
| 48 | _LIBCPP_END_NAMESPACE_STD |
| 49 | |
| 50 | #endif // _LIBCPP___TYPE_TRAITS_INTEGRAL_CONSTANT_H |
| 51 |