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 43 noexcept(noexcept(_LIBCPP_AUTO_CAST(std::forward<_Tp>(__t)))) 44 -> decltype(_LIBCPP_AUTO_CAST(std::forward<_Tp>(__t))) { 45 return _LIBCPP_AUTO_CAST(std::forward<_Tp>(__t)); 46 } 47 48 template <class _Tp> 49 requires(!ranges::view<decay_t<_Tp>>) && requires(_Tp&& __t) { ranges::ref_view{std::forward<_Tp>(__t)}; } 50 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const 51 noexcept(noexcept(ranges::ref_view{std::forward<_Tp>(__t)})) { 52 return ranges::ref_view{std::forward<_Tp>(__t)}; 53 } 54 55 template <class _Tp> 56 requires( 57 !ranges::view<decay_t<_Tp>> && !requires(_Tp&& __t) { ranges::ref_view{std::forward<_Tp>(__t)}; } && 58 requires(_Tp&& __t) { ranges::owning_view{std::forward<_Tp>(__t)}; }) 59 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const 60 noexcept(noexcept(ranges::owning_view{std::forward<_Tp>(__t)})) { 61 return ranges::owning_view{std::forward<_Tp>(__t)}; 62 } 63 }; 64 } // namespace __all 65 66 inline namespace __cpo { 67 inline constexpr auto all = __all::__fn{}; 68 } // namespace __cpo 69 70 template <ranges::viewable_range _Range> 71 using all_t = decltype(views::all(std::declval<_Range>())); 72 73 } // namespace ranges::views 74 75 #endif // _LIBCPP_STD_VER >= 20 76 77 _LIBCPP_END_NAMESPACE_STD 78 79 #endif // _LIBCPP___RANGES_ALL_H 80