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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___ITERATOR_ISTREAM_ITERATOR_H
#define _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H
#include <__config>
#include <__fwd/istream.h>
#include <__fwd/string.h>
#include <__iterator/default_sentinel.h>
#include <__iterator/iterator.h>
#include <__iterator/iterator_traits.h>
#include <__memory/addressof.h>
#include <cstddef>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _Tp, class _CharT = char,
class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>
class _LIBCPP_TEMPLATE_VIS istream_iterator
#if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
: public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&>
#endif
{
_LIBCPP_SUPPRESS_DEPRECATED_POP
public:
typedef input_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Distance difference_type;
typedef const _Tp* pointer;
typedef const _Tp& reference;
typedef _CharT char_type;
typedef _Traits traits_type;
typedef basic_istream<_CharT,_Traits> istream_type;
private:
istream_type* __in_stream_;
_Tp __value_;
public:
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {}
#if _LIBCPP_STD_VER >= 20
_LIBCPP_HIDE_FROM_ABI constexpr istream_iterator(default_sentinel_t) : istream_iterator() {}
#endif // _LIBCPP_STD_VER >= 20
_LIBCPP_HIDE_FROM_ABI istream_iterator(istream_type& __s) : __in_stream_(std::addressof(__s))
{
if (!(*__in_stream_ >> __value_))
__in_stream_ = nullptr;
}
_LIBCPP_HIDE_FROM_ABI const _Tp& operator*() const {return __value_;}
_LIBCPP_HIDE_FROM_ABI const _Tp* operator->() const {return std::addressof((operator*()));}
_LIBCPP_HIDE_FROM_ABI istream_iterator& operator++()
{
if (!(*__in_stream_ >> __value_))
__in_stream_ = nullptr;
return *this;
}
_LIBCPP_HIDE_FROM_ABI istream_iterator operator++(int)
{istream_iterator __t(*this); ++(*this); return __t;}
template <class _Up, class _CharU, class _TraitsU, class _DistanceU>
friend _LIBCPP_HIDE_FROM_ABI
bool
operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,
const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);
#if _LIBCPP_STD_VER >= 20
friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator& __i, default_sentinel_t) {
return __i.__in_stream_ == nullptr;
}
#endif // _LIBCPP_STD_VER >= 20
};
template <class _Tp, class _CharT, class _Traits, class _Distance>
inline _LIBCPP_HIDE_FROM_ABI
bool
operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y)
{
return __x.__in_stream_ == __y.__in_stream_;
}
#if _LIBCPP_STD_VER <= 17
template <class _Tp, class _CharT, class _Traits, class _Distance>
inline _LIBCPP_HIDE_FROM_ABI
bool
operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y)
{
return !(__x == __y);
}
#endif // _LIBCPP_STD_VER <= 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H
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