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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_CONJUNCTION_H |
| 10 | #define _LIBCPP___TYPE_TRAITS_CONJUNCTION_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__type_traits/conditional.h> |
| 14 | #include <__type_traits/enable_if.h> |
| 15 | #include <__type_traits/integral_constant.h> |
| 16 | #include <__type_traits/is_same.h> |
| 17 | |
| 18 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 19 | # pragma GCC system_header |
| 20 | #endif |
| 21 | |
| 22 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 23 | |
| 24 | template <class...> |
| 25 | using __expand_to_true _LIBCPP_NODEBUG = true_type; |
| 26 | |
| 27 | template <class... _Pred> |
| 28 | __expand_to_true<__enable_if_t<_Pred::value>...> __and_helper(int); |
| 29 | |
| 30 | template <class...> |
| 31 | false_type __and_helper(...); |
| 32 | |
| 33 | // _And always performs lazy evaluation of its arguments. |
| 34 | // |
| 35 | // However, `_And<_Pred...>` itself will evaluate its result immediately (without having to |
| 36 | // be instantiated) since it is an alias, unlike `conjunction<_Pred...>`, which is a struct. |
| 37 | // If you want to defer the evaluation of `_And<_Pred...>` itself, use `_Lazy<_And, _Pred...>`. |
| 38 | template <class... _Pred> |
| 39 | using _And _LIBCPP_NODEBUG = decltype(std::__and_helper<_Pred...>(0)); |
| 40 | |
| 41 | template <bool... _Preds> |
| 42 | struct __all_dummy; |
| 43 | |
| 44 | template <bool... _Pred> |
| 45 | struct __all : _IsSame<__all_dummy<_Pred...>, __all_dummy<((void)_Pred, true)...> > {}; |
| 46 | |
| 47 | #if _LIBCPP_STD_VER >= 17 |
| 48 | |
| 49 | template <class...> |
| 50 | struct _LIBCPP_NO_SPECIALIZATIONS conjunction : true_type {}; |
| 51 | |
| 52 | _LIBCPP_DIAGNOSTIC_PUSH |
| 53 | # if __has_warning("-Winvalid-specialization") |
| 54 | _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-specialization") |
| 55 | # endif |
| 56 | template <class _Arg> |
| 57 | struct conjunction<_Arg> : _Arg {}; |
| 58 | |
| 59 | template <class _Arg, class... _Args> |
| 60 | struct conjunction<_Arg, _Args...> : conditional_t<!bool(_Arg::value), _Arg, conjunction<_Args...>> {}; |
| 61 | _LIBCPP_DIAGNOSTIC_POP |
| 62 | |
| 63 | template <class... _Args> |
| 64 | _LIBCPP_NO_SPECIALIZATIONS inline constexpr bool conjunction_v = conjunction<_Args...>::value; |
| 65 | |
| 66 | #endif // _LIBCPP_STD_VER >= 17 |
| 67 | |
| 68 | _LIBCPP_END_NAMESPACE_STD |
| 69 | |
| 70 | #endif // _LIBCPP___TYPE_TRAITS_CONJUNCTION_H |
| 71 |
Warning: This file is not a C or C++ file. It does not have highlighting.