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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___CXX03___RANGES_REF_VIEW_H
#define _LIBCPP___CXX03___RANGES_REF_VIEW_H
#include <__cxx03/__concepts/convertible_to.h>
#include <__cxx03/__concepts/different_from.h>
#include <__cxx03/__config>
#include <__cxx03/__iterator/concepts.h>
#include <__cxx03/__iterator/incrementable_traits.h>
#include <__cxx03/__iterator/iterator_traits.h>
#include <__cxx03/__memory/addressof.h>
#include <__cxx03/__ranges/access.h>
#include <__cxx03/__ranges/concepts.h>
#include <__cxx03/__ranges/data.h>
#include <__cxx03/__ranges/empty.h>
#include <__cxx03/__ranges/enable_borrowed_range.h>
#include <__cxx03/__ranges/size.h>
#include <__cxx03/__ranges/view_interface.h>
#include <__cxx03/__type_traits/is_object.h>
#include <__cxx03/__utility/declval.h>
#include <__cxx03/__utility/forward.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 20
namespace ranges {
template <range _Range>
requires is_object_v<_Range>
class ref_view : public view_interface<ref_view<_Range>> {
_Range* __range_;
static void __fun(_Range&);
static void __fun(_Range&&) = delete; // NOLINT(modernize-use-equals-delete) ; This is llvm.org/PR54276
public:
template <class _Tp>
requires __different_from<_Tp, ref_view> && convertible_to<_Tp, _Range&> && requires { __fun(std::declval<_Tp>()); }
_LIBCPP_HIDE_FROM_ABI constexpr ref_view(_Tp&& __t)
: __range_(std::addressof(static_cast<_Range&>(std::forward<_Tp>(__t)))) {}
_LIBCPP_HIDE_FROM_ABI constexpr _Range& base() const { return *__range_; }
_LIBCPP_HIDE_FROM_ABI constexpr iterator_t<_Range> begin() const { return ranges::begin(*__range_); }
_LIBCPP_HIDE_FROM_ABI constexpr sentinel_t<_Range> end() const { return ranges::end(*__range_); }
_LIBCPP_HIDE_FROM_ABI constexpr bool empty() const
requires requires { ranges::empty(*__range_); }
{
return ranges::empty(*__range_);
}
_LIBCPP_HIDE_FROM_ABI constexpr auto size() const
requires sized_range<_Range>
{
return ranges::size(*__range_);
}
_LIBCPP_HIDE_FROM_ABI constexpr auto data() const
requires contiguous_range<_Range>
{
return ranges::data(*__range_);
}
};
template <class _Range>
ref_view(_Range&) -> ref_view<_Range>;
template <class _Tp>
inline constexpr bool enable_borrowed_range<ref_view<_Tp>> = true;
} // namespace ranges
#endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___CXX03___RANGES_REF_VIEW_H
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