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 <__ranges/access.h> 16 #include <concepts> 17 #include <type_traits> 18 19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20 #pragma GCC system_header 21 #endif 22 23 _LIBCPP_PUSH_MACROS 24 #include <__undef_macros> 25 26 _LIBCPP_BEGIN_NAMESPACE_STD 27 28 #if !defined(_LIBCPP_HAS_NO_RANGES) 29 30 // clang-format off 31 namespace ranges { 32 // [range.prim.data] 33 namespace __data { 34 template <class _Tp> 35 concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>; 36 37 template <class _Tp> 38 concept __member_data = requires(_Tp && __t)39 requires(_Tp&& __t) { 40 { _VSTD::forward<_Tp>(__t) } -> __can_borrow; 41 { __t.data() } -> __ptr_to_object; 42 }; 43 44 template <class _Tp> 45 concept __ranges_begin_invocable = 46 !__member_data<_Tp> && 47 requires(_Tp&& __t) { 48 { _VSTD::forward<_Tp>(__t) } -> __can_borrow; 49 { ranges::begin(_VSTD::forward<_Tp>(__t)) } -> contiguous_iterator; 50 }; 51 52 struct __fn { 53 template <__member_data _Tp> 54 requires __can_borrow<_Tp> operator__fn55 constexpr __ptr_to_object auto operator()(_Tp&& __t) const 56 noexcept(noexcept(__t.data())) { 57 return __t.data(); 58 } 59 60 template<__ranges_begin_invocable _Tp> 61 requires __can_borrow<_Tp> operator__fn62 constexpr __ptr_to_object auto operator()(_Tp&& __t) const 63 noexcept(noexcept(_VSTD::to_address(ranges::begin(_VSTD::forward<_Tp>(__t))))) { 64 return _VSTD::to_address(ranges::begin(_VSTD::forward<_Tp>(__t))); 65 } 66 }; 67 } // end namespace __data 68 69 inline namespace __cpo { 70 inline constexpr const auto data = __data::__fn{}; 71 } // namespace __cpo 72 } // namespace ranges 73 74 // clang-format off 75 76 #endif // !defined(_LIBCPP_HAS_NO_RANGES) 77 78 _LIBCPP_END_NAMESPACE_STD 79 80 _LIBCPP_POP_MACROS 81 82 #endif // _LIBCPP___RANGES_DATA_H 83