| // -*- 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 <__concepts/class_or_enum.h> |
| #include <__config> |
| #include <__iterator/concepts.h> |
| #include <__iterator/iterator_traits.h> |
| #include <__memory/pointer_traits.h> |
| #include <__ranges/access.h> |
| #include <__type_traits/decay.h> |
| #include <__type_traits/is_object.h> |
| #include <__type_traits/is_pointer.h> |
| #include <__type_traits/is_reference.h> |
| #include <__type_traits/remove_pointer.h> |
| #include <__type_traits/remove_reference.h> |
| #include <__utility/auto_cast.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| // [range.prim.data] |
| |
| namespace ranges { |
| 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 = __can_borrow<_Tp> && requires(_Tp&& __t) { |
| { _LIBCPP_AUTO_CAST(__t.data()) } -> __ptr_to_object; |
| }; |
| |
| template <class _Tp> |
| concept __ranges_begin_invocable = !__member_data<_Tp> && __can_borrow<_Tp> && requires(_Tp&& __t) { |
| { ranges::begin(__t) } -> contiguous_iterator; |
| }; |
| |
| struct __fn { |
| template <__member_data _Tp> |
| _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(noexcept(__t.data())) { |
| return __t.data(); |
| } |
| |
| template <__ranges_begin_invocable _Tp> |
| _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const |
| noexcept(noexcept(std::to_address(ranges::begin(__t)))) { |
| return std::to_address(ranges::begin(__t)); |
| } |
| }; |
| } // namespace __data |
| |
| inline namespace __cpo { |
| inline constexpr auto data = __data::__fn{}; |
| } // namespace __cpo |
| } // namespace ranges |
| |
| // [range.prim.cdata] |
| |
| namespace ranges { |
| namespace __cdata { |
| struct __fn { |
| template <class _Tp> |
| requires is_lvalue_reference_v<_Tp&&> |
| [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const |
| noexcept(noexcept(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t)))) |
| -> decltype(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t))) { |
| return ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t)); |
| } |
| |
| template <class _Tp> |
| requires is_rvalue_reference_v<_Tp&&> |
| [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const |
| noexcept(noexcept(ranges::data(static_cast<const _Tp&&>(__t)))) |
| -> decltype(ranges::data(static_cast<const _Tp&&>(__t))) { |
| return ranges::data(static_cast<const _Tp&&>(__t)); |
| } |
| }; |
| } // namespace __cdata |
| |
| inline namespace __cpo { |
| inline constexpr auto cdata = __cdata::__fn{}; |
| } // namespace __cpo |
| } // namespace ranges |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___RANGES_DATA_H |