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// -*- 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 <__utility/auto_cast.h>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER > 17
// [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> &&
__workaround_52970<_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 > 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___RANGES_DATA_H
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