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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_CONDITIONAL_H |
| 10 | #define _LIBCPP___TYPE_TRAITS_CONDITIONAL_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 <bool> |
| 21 | struct _IfImpl; |
| 22 | |
| 23 | template <> |
| 24 | struct _IfImpl<true> { |
| 25 | template <class _IfRes, class _ElseRes> |
| 26 | using _Select _LIBCPP_NODEBUG = _IfRes; |
| 27 | }; |
| 28 | |
| 29 | template <> |
| 30 | struct _IfImpl<false> { |
| 31 | template <class _IfRes, class _ElseRes> |
| 32 | using _Select _LIBCPP_NODEBUG = _ElseRes; |
| 33 | }; |
| 34 | |
| 35 | template <bool _Cond, class _IfRes, class _ElseRes> |
| 36 | using _If _LIBCPP_NODEBUG = typename _IfImpl<_Cond>::template _Select<_IfRes, _ElseRes>; |
| 37 | |
| 38 | template <bool _Bp, class _If, class _Then> |
| 39 | struct _LIBCPP_NO_SPECIALIZATIONS conditional { |
| 40 | using type _LIBCPP_NODEBUG = _If; |
| 41 | }; |
| 42 | |
| 43 | _LIBCPP_DIAGNOSTIC_PUSH |
| 44 | #if __has_warning("-Winvalid-specialization") |
| 45 | _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-specialization") |
| 46 | #endif |
| 47 | template <class _If, class _Then> |
| 48 | struct conditional<false, _If, _Then> { |
| 49 | using type _LIBCPP_NODEBUG = _Then; |
| 50 | }; |
| 51 | _LIBCPP_DIAGNOSTIC_POP |
| 52 | |
| 53 | #if _LIBCPP_STD_VER >= 14 |
| 54 | template <bool _Bp, class _IfRes, class _ElseRes> |
| 55 | using conditional_t _LIBCPP_NODEBUG = typename conditional<_Bp, _IfRes, _ElseRes>::type; |
| 56 | #endif |
| 57 | |
| 58 | // Helper so we can use "conditional_t" in all language versions. |
| 59 | template <bool _Bp, class _If, class _Then> |
| 60 | using __conditional_t _LIBCPP_NODEBUG = typename conditional<_Bp, _If, _Then>::type; |
| 61 | |
| 62 | _LIBCPP_END_NAMESPACE_STD |
| 63 | |
| 64 | #endif // _LIBCPP___TYPE_TRAITS_CONDITIONAL_H |
| 65 |
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