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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_REF_VIEW_H 
#define _LIBCPP___RANGES_REF_VIEW_H 
 
#include <__config> 
#include <__iterator/concepts.h> 
#include <__iterator/incrementable_traits.h> 
#include <__iterator/iterator_traits.h> 
#include <__memory/addressof.h> 
#include <__ranges/access.h> 
#include <__ranges/concepts.h> 
#include <__ranges/data.h> 
#include <__ranges/empty.h> 
#include <__ranges/size.h> 
#include <__ranges/view_interface.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) 
 
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; 
 
public: 
    template<class _Tp> 
      requires __different_from<_Tp, ref_view> && 
        convertible_to<_Tp, _Range&> && requires { __fun(declval<_Tp>()); } 
    _LIBCPP_HIDE_FROM_ABI 
    constexpr ref_view(_Tp&& __t) 
      : __range_(_VSTD::addressof(static_cast<_Range&>(_VSTD::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>; 
 
} // namespace ranges 
 
#endif // !defined(_LIBCPP_HAS_NO_RANGES) 
 
_LIBCPP_END_NAMESPACE_STD 
 
#endif // _LIBCPP___RANGES_REF_VIEW_H