| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| #ifndef _LIBCPP___RANGES_DATA_H |
| #define _LIBCPP___RANGES_DATA_H |
| |
| #include <__config> |
| #include <__iterator/concepts.h> |
| #include <__iterator/iterator_traits.h> |
| #include <__memory/pointer_traits.h> |
| #include <__ranges/access.h> |
| #include <__utility/forward.h> |
| #include <concepts> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if !defined(_LIBCPP_HAS_NO_RANGES) |
| |
| // clang-format off |
| namespace ranges { |
| // [range.prim.data] |
| namespace __data { |
| template <class _Tp> |
| concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>; |
| |
| template <class _Tp> |
| concept __member_data = |
| requires(_Tp&& __t) { |
| { _VSTD::forward<_Tp>(__t) } -> __can_borrow; |
| { __t.data() } -> __ptr_to_object; |
| }; |
| |
| template <class _Tp> |
| concept __ranges_begin_invocable = |
| !__member_data<_Tp> && |
| requires(_Tp&& __t) { |
| { _VSTD::forward<_Tp>(__t) } -> __can_borrow; |
| { ranges::begin(_VSTD::forward<_Tp>(__t)) } -> contiguous_iterator; |
| }; |
| |
| struct __fn { |
| template <__member_data _Tp> |
| requires __can_borrow<_Tp> |
| _LIBCPP_HIDE_FROM_ABI |
| constexpr __ptr_to_object auto operator()(_Tp&& __t) const |
| noexcept(noexcept(__t.data())) { |
| return __t.data(); |
| } |
| |
| template<__ranges_begin_invocable _Tp> |
| requires __can_borrow<_Tp> |
| _LIBCPP_HIDE_FROM_ABI |
| constexpr __ptr_to_object auto operator()(_Tp&& __t) const |
| noexcept(noexcept(_VSTD::to_address(ranges::begin(_VSTD::forward<_Tp>(__t))))) { |
| return _VSTD::to_address(ranges::begin(_VSTD::forward<_Tp>(__t))); |
| } |
| }; |
| } // end namespace __data |
| |
| inline namespace __cpo { |
| inline constexpr auto data = __data::__fn{}; |
| } // namespace __cpo |
| } // namespace ranges |
| |
| // clang-format off |
| |
| #endif // !defined(_LIBCPP_HAS_NO_RANGES) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___RANGES_DATA_H |