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 #ifndef _LIBCPP___RANGES_ALL_H 10 #define _LIBCPP___RANGES_ALL_H 11 12 #include <__config> 13 #include <__iterator/concepts.h> 14 #include <__iterator/iterator_traits.h> 15 #include <__ranges/access.h> 16 #include <__ranges/concepts.h> 17 #include <__ranges/ref_view.h> 18 #include <__ranges/subrange.h> 19 #include <__utility/__decay_copy.h> 20 #include <__utility/declval.h> 21 #include <__utility/forward.h> 22 #include <type_traits> 23 24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 25 #pragma GCC system_header 26 #endif 27 28 _LIBCPP_PUSH_MACROS 29 #include <__undef_macros> 30 31 _LIBCPP_BEGIN_NAMESPACE_STD 32 33 #if !defined(_LIBCPP_HAS_NO_RANGES) 34 35 namespace views { 36 37 namespace __all { 38 struct __fn { 39 template<class _Tp> 40 requires ranges::view<decay_t<_Tp>> 41 _LIBCPP_HIDE_FROM_ABI 42 constexpr auto operator()(_Tp&& __t) const 43 noexcept(noexcept(_VSTD::__decay_copy(_VSTD::forward<_Tp>(__t)))) 44 { 45 return _VSTD::forward<_Tp>(__t); 46 } 47 48 template<class _Tp> 49 requires (!ranges::view<decay_t<_Tp>>) && 50 requires (_Tp&& __t) { ranges::ref_view{_VSTD::forward<_Tp>(__t)}; } 51 _LIBCPP_HIDE_FROM_ABI 52 constexpr auto operator()(_Tp&& __t) const 53 noexcept(noexcept(ranges::ref_view{_VSTD::forward<_Tp>(__t)})) 54 { 55 return ranges::ref_view{_VSTD::forward<_Tp>(__t)}; 56 } 57 58 template<class _Tp> 59 requires (!ranges::view<decay_t<_Tp>> && 60 !requires (_Tp&& __t) { ranges::ref_view{_VSTD::forward<_Tp>(__t)}; } && 61 requires (_Tp&& __t) { ranges::subrange{_VSTD::forward<_Tp>(__t)}; }) 62 _LIBCPP_HIDE_FROM_ABI 63 constexpr auto operator()(_Tp&& __t) const 64 noexcept(noexcept(ranges::subrange{_VSTD::forward<_Tp>(__t)})) 65 { 66 return ranges::subrange{_VSTD::forward<_Tp>(__t)}; 67 } 68 }; 69 } 70 71 inline namespace __cpo { 72 inline constexpr auto all = __all::__fn{}; 73 } // namespace __cpo 74 75 template<ranges::viewable_range _Range> 76 using all_t = decltype(views::all(declval<_Range>())); 77 78 } // namespace views 79 80 #endif // !defined(_LIBCPP_HAS_NO_RANGES) 81 82 _LIBCPP_END_NAMESPACE_STD 83 84 _LIBCPP_POP_MACROS 85 86 #endif // _LIBCPP___RANGES_ALL_H 87