1 // -*- C++ -*- 2 //===------------------------ __ranges/data.h ------------------------------===// 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_DATA_H 10 #define _LIBCPP___RANGES_DATA_H 11 12 #include <__config> 13 #include <__iterator/concepts.h> 14 #include <__iterator/iterator_traits.h> 15 #include <__memory/pointer_traits.h> 16 #include <__ranges/access.h> 17 #include <__utility/forward.h> 18 #include <concepts> 19 #include <type_traits> 20 21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22 #pragma GCC system_header 23 #endif 24 25 _LIBCPP_PUSH_MACROS 26 #include <__undef_macros> 27 28 _LIBCPP_BEGIN_NAMESPACE_STD 29 30 #if !defined(_LIBCPP_HAS_NO_RANGES) 31 32 // clang-format off 33 namespace ranges { 34 // [range.prim.data] 35 namespace __data { 36 template <class _Tp> 37 concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>; 38 39 template <class _Tp> 40 concept __member_data = 41 requires(_Tp&& __t) { 42 { _VSTD::forward<_Tp>(__t) } -> __can_borrow; 43 { __t.data() } -> __ptr_to_object; 44 }; 45 46 template <class _Tp> 47 concept __ranges_begin_invocable = 48 !__member_data<_Tp> && 49 requires(_Tp&& __t) { 50 { _VSTD::forward<_Tp>(__t) } -> __can_borrow; 51 { ranges::begin(_VSTD::forward<_Tp>(__t)) } -> contiguous_iterator; 52 }; 53 54 struct __fn { 55 template <__member_data _Tp> 56 requires __can_borrow<_Tp> 57 _LIBCPP_HIDE_FROM_ABI 58 constexpr __ptr_to_object auto operator()(_Tp&& __t) const 59 noexcept(noexcept(__t.data())) { 60 return __t.data(); 61 } 62 63 template<__ranges_begin_invocable _Tp> 64 requires __can_borrow<_Tp> 65 _LIBCPP_HIDE_FROM_ABI 66 constexpr __ptr_to_object auto operator()(_Tp&& __t) const 67 noexcept(noexcept(_VSTD::to_address(ranges::begin(_VSTD::forward<_Tp>(__t))))) { 68 return _VSTD::to_address(ranges::begin(_VSTD::forward<_Tp>(__t))); 69 } 70 }; 71 } // end namespace __data 72 73 inline namespace __cpo { 74 inline constexpr const auto data = __data::__fn{}; 75 } // namespace __cpo 76 } // namespace ranges 77 78 // clang-format off 79 80 #endif // !defined(_LIBCPP_HAS_NO_RANGES) 81 82 _LIBCPP_END_NAMESPACE_STD 83 84 _LIBCPP_POP_MACROS 85 86 #endif // _LIBCPP___RANGES_DATA_H 87