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// -*- C++ -*-
//===------------------------ __ranges/data.h ------------------------------===//
//
// 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
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