mirror of
https://github.com/jart/cosmopolitan.git
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102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___RANGES_DATA_H
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#define _LIBCPP___RANGES_DATA_H
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#include <__concepts/class_or_enum.h>
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/iterator_traits.h>
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#include <__memory/pointer_traits.h>
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#include <__ranges/access.h>
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#include <__type_traits/decay.h>
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#include <__type_traits/is_object.h>
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#include <__type_traits/is_pointer.h>
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#include <__type_traits/is_reference.h>
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#include <__type_traits/remove_pointer.h>
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#include <__type_traits/remove_reference.h>
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#include <__utility/auto_cast.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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// [range.prim.data]
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namespace ranges {
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namespace __data {
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template <class _Tp>
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concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>;
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template <class _Tp>
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concept __member_data = __can_borrow<_Tp> && requires(_Tp&& __t) {
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{ _LIBCPP_AUTO_CAST(__t.data()) } -> __ptr_to_object;
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};
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template <class _Tp>
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concept __ranges_begin_invocable = !__member_data<_Tp> && __can_borrow<_Tp> && requires(_Tp&& __t) {
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{ ranges::begin(__t) } -> contiguous_iterator;
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};
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struct __fn {
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template <__member_data _Tp>
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_LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(noexcept(__t.data())) {
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return __t.data();
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}
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template <__ranges_begin_invocable _Tp>
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_LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
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noexcept(noexcept(std::to_address(ranges::begin(__t)))) {
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return std::to_address(ranges::begin(__t));
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}
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};
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} // namespace __data
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inline namespace __cpo {
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inline constexpr auto data = __data::__fn{};
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} // namespace __cpo
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} // namespace ranges
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// [range.prim.cdata]
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namespace ranges {
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namespace __cdata {
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struct __fn {
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template <class _Tp>
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requires is_lvalue_reference_v<_Tp&&>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
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noexcept(noexcept(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t))))
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-> decltype(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t))) {
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return ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t));
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}
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template <class _Tp>
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requires is_rvalue_reference_v<_Tp&&>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(
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noexcept(ranges::data(static_cast<const _Tp&&>(__t)))) -> decltype(ranges::data(static_cast<const _Tp&&>(__t))) {
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return ranges::data(static_cast<const _Tp&&>(__t));
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}
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};
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} // namespace __cdata
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inline namespace __cpo {
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inline constexpr auto cdata = __cdata::__fn{};
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} // namespace __cpo
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} // namespace ranges
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___RANGES_DATA_H
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