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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 <__cstddef/ptrdiff_t.h>
15#include <__fwd/istream.h>
16#include <__fwd/string.h>
17#include <__iterator/default_sentinel.h>
18#include <__iterator/iterator.h>
19#include <__iterator/iterator_traits.h>
20#include <__memory/addressof.h>
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 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 // LWG3600 Changed the wording of the copy constructor. In libc++ this constructor
62 // can still be trivial after this change.
63
64 _LIBCPP_HIDE_FROM_ABI const _Tp& operator*() const { return __value_; }
65 _LIBCPP_HIDE_FROM_ABI const _Tp* operator->() const { return std::addressof((operator*())); }
66 _LIBCPP_HIDE_FROM_ABI istream_iterator& operator++() {
67 if (!(*__in_stream_ >> __value_))
68 __in_stream_ = nullptr;
69 return *this;
70 }
71 _LIBCPP_HIDE_FROM_ABI istream_iterator operator++(int) {
72 istream_iterator __t(*this);
73 ++(*this);
74 return __t;
75 }
76
77 template <class _Up, class _CharU, class _TraitsU, class _DistanceU>
78 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __x,
79 const istream_iterator<_Up, _CharU, _TraitsU, _DistanceU>& __y);
80
81#if _LIBCPP_STD_VER >= 20
82 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator& __i, default_sentinel_t) {
83 return __i.__in_stream_ == nullptr;
84 }
85#endif // _LIBCPP_STD_VER >= 20
86};
87
88template <class _Tp, class _CharT, class _Traits, class _Distance>
89inline _LIBCPP_HIDE_FROM_ABI bool operator==(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
90 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) {
91 return __x.__in_stream_ == __y.__in_stream_;
92}
93
94#if _LIBCPP_STD_VER <= 17
95template <class _Tp, class _CharT, class _Traits, class _Distance>
96inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __x,
97 const istream_iterator<_Tp, _CharT, _Traits, _Distance>& __y) {
98 return !(__x == __y);
99}
100#endif // _LIBCPP_STD_VER <= 17
101
102_LIBCPP_END_NAMESPACE_STD
103
104#endif // _LIBCPP___ITERATOR_ISTREAM_ITERATOR_H