1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___RANGES_ALL_H 11 #define _LIBCPP___RANGES_ALL_H 12 13 #include <__config> 14 #include <__functional/compose.h> // TODO(modules): Those should not be required 15 #include <__functional/perfect_forward.h> // 16 #include <__iterator/concepts.h> 17 #include <__iterator/iterator_traits.h> 18 #include <__ranges/access.h> 19 #include <__ranges/concepts.h> 20 #include <__ranges/owning_view.h> 21 #include <__ranges/range_adaptor.h> 22 #include <__ranges/ref_view.h> 23 #include <__type_traits/decay.h> 24 #include <__utility/auto_cast.h> 25 #include <__utility/declval.h> 26 #include <__utility/forward.h> 27 28 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 29 # pragma GCC system_header 30 #endif 31 32 _LIBCPP_BEGIN_NAMESPACE_STD 33 34 #if _LIBCPP_STD_VER >= 20 35 36 namespace ranges::views { 37 38 namespace __all { 39 struct __fn : __range_adaptor_closure<__fn> { 40 template <class _Tp> 41 requires ranges::view<decay_t<_Tp>> 42 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept( 43 noexcept(_LIBCPP_AUTO_CAST(std::forward<_Tp>(__t)))) -> decltype(_LIBCPP_AUTO_CAST(std::forward<_Tp>(__t))) { 44 return _LIBCPP_AUTO_CAST(std::forward<_Tp>(__t)); 45 } 46 47 template <class _Tp> 48 requires(!ranges::view<decay_t<_Tp>>) && requires(_Tp&& __t) { ranges::ref_view{std::forward<_Tp>(__t)}; } 49 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const 50 noexcept(noexcept(ranges::ref_view{std::forward<_Tp>(__t)})) { 51 return ranges::ref_view{std::forward<_Tp>(__t)}; 52 } 53 54 template <class _Tp> 55 requires( 56 !ranges::view<decay_t<_Tp>> && !requires(_Tp&& __t) { ranges::ref_view{std::forward<_Tp>(__t)}; } && 57 requires(_Tp&& __t) { ranges::owning_view{std::forward<_Tp>(__t)}; }) 58 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const 59 noexcept(noexcept(ranges::owning_view{std::forward<_Tp>(__t)})) { 60 return ranges::owning_view{std::forward<_Tp>(__t)}; 61 } 62 }; 63 } // namespace __all 64 65 inline namespace __cpo { 66 inline constexpr auto all = __all::__fn{}; 67 } // namespace __cpo 68 69 template <ranges::viewable_range _Range> 70 using all_t = decltype(views::all(std::declval<_Range>())); 71 72 } // namespace ranges::views 73 74 #endif // _LIBCPP_STD_VER >= 20 75 76 _LIBCPP_END_NAMESPACE_STD 77 78 #endif // _LIBCPP___RANGES_ALL_H 79