1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H
11#define _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H
12
13#include <__config>
14#include <__fwd/istream.h>
15#include <__fwd/string.h>
16#include <__iterator/default_sentinel.h>
17#include <__iterator/iterator.h>
18#include <__iterator/iterator_traits.h>
19#include <__memory/addressof.h>
20#include <cstddef>
21
22#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23#  pragma GCC system_header
24#endif
25
26_LIBCPP_BEGIN_NAMESPACE_STD
27
28_LIBCPP_SUPPRESS_DEPRECATED_PUSH
29template <class _Tp, class _CharT = char, class _Traits = char_traits<_CharT>, class _Distance = ptrdiff_t>
30class _LIBCPP_TEMPLATE_VIS istream_iterator
31#if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
32    : public iterator<input_iterator_tag, _Tp, _Distance, const _Tp*, const _Tp&>
33#endif
34{
35  _LIBCPP_SUPPRESS_DEPRECATED_POP
36
37public:
38  typedef input_iterator_tag iterator_category;
39  typedef _Tp value_type;
40  typedef _Distance difference_type;
41  typedef const _Tp* pointer;
42  typedef const _Tp& reference;
43  typedef _CharT char_type;
44  typedef _Traits traits_type;
45  typedef basic_istream<_CharT, _Traits> istream_type;
46
47private:
48  istream_type* __in_stream_;
49  _Tp __value_;
50
51public:
52  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR istream_iterator() : __in_stream_(nullptr), __value_() {}
53#if _LIBCPP_STD_VER >= 20
54  _LIBCPP_HIDE_FROM_ABI constexpr istream_iterator(default_sentinel_t) : istream_iterator() {}
55#endif // _LIBCPP_STD_VER >= 20
56  _LIBCPP_HIDE_FROM_ABI istream_iterator(istream_type& __s) : __in_stream_(std::addressof(__s)) {
57    if (!(*__in_stream_ >> __value_))
58      __in_stream_ = nullptr;
59  }
60
61  _LIBCPP_HIDE_FROM_ABI const _Tp& operator*() const { return __value_; }
62  _LIBCPP_HIDE_FROM_ABI const _Tp* operator->() const { return std::addressof((operator*())); }
63  _LIBCPP_HIDE_FROM_ABI istream_iterator& operator++() {
64    if (!(*__in_stream_ >> __value_))
65      __in_stream_ = nullptr;
66    return *this;
67  }
68  _LIBCPP_HIDE_FROM_ABI istream_iterator operator++(int) {
69    istream_iterator __t(*this);
70    ++(*this);
71    return __t;
72  }
73
74  template <class _Up, class _CharU, class _TraitsU, class _DistanceU>
75  friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,
76                                               const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);
77
78#if _LIBCPP_STD_VER >= 20
79  friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator& __i, default_sentinel_t) {
80    return __i.__in_stream_ == nullptr;
81  }
82#endif // _LIBCPP_STD_VER >= 20
83};
84
85template <class _Tp, class _CharT, class _Traits, class _Distance>
86inline _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
87                                             const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) {
88  return __x.__in_stream_ == __y.__in_stream_;
89}
90
91#if _LIBCPP_STD_VER <= 17
92template <class _Tp, class _CharT, class _Traits, class _Distance>
93inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
94                                             const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) {
95  return !(__x == __y);
96}
97#endif // _LIBCPP_STD_VER <= 17
98
99_LIBCPP_END_NAMESPACE_STD
100
101#endif // _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H
102