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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_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_NO_SPECIALIZATIONS integral_constant { |
22 | static inline _LIBCPP_CONSTEXPR const _Tp value = __v; |
23 | typedef _Tp value_type; |
24 | typedef integral_constant type; |
25 | _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR operator value_type() const _NOEXCEPT { return value; } |
26 | #if _LIBCPP_STD_VER >= 14 |
27 | _LIBCPP_HIDE_FROM_ABI constexpr value_type operator()() const _NOEXCEPT { return value; } |
28 | #endif |
29 | }; |
30 | |
31 | typedef integral_constant<bool, true> true_type; |
32 | typedef integral_constant<bool, false> false_type; |
33 | |
34 | template <bool _Val> |
35 | using _BoolConstant _LIBCPP_NODEBUG = integral_constant<bool, _Val>; |
36 | |
37 | #if _LIBCPP_STD_VER >= 17 |
38 | template <bool __b> |
39 | using bool_constant = integral_constant<bool, __b>; |
40 | #endif |
41 | |
42 | _LIBCPP_END_NAMESPACE_STD |
43 | |
44 | #endif // _LIBCPP___TYPE_TRAITS_INTEGRAL_CONSTANT_H |
45 |
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