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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___CXX03___ITERATOR_ISTREAMBUF_ITERATOR_H
11#define _LIBCPP___CXX03___ITERATOR_ISTREAMBUF_ITERATOR_H
12
13#include <__cxx03/__config>
14#include <__cxx03/__fwd/istream.h>
15#include <__cxx03/__fwd/streambuf.h>
16#include <__cxx03/__iterator/iterator.h>
17#include <__cxx03/__iterator/iterator_traits.h>
18
19#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
20# pragma GCC system_header
21#endif
22
23_LIBCPP_BEGIN_NAMESPACE_STD
24
25_LIBCPP_SUPPRESS_DEPRECATED_PUSH
26template <class _CharT, class _Traits>
27class _LIBCPP_TEMPLATE_VIS istreambuf_iterator
28 : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT> {
29 _LIBCPP_SUPPRESS_DEPRECATED_POP
30
31public:
32 typedef input_iterator_tag iterator_category;
33 typedef _CharT value_type;
34 typedef typename _Traits::off_type difference_type;
35 typedef _CharT* pointer;
36 typedef _CharT reference;
37 typedef _CharT char_type;
38 typedef _Traits traits_type;
39 typedef typename _Traits::int_type int_type;
40 typedef basic_streambuf<_CharT, _Traits> streambuf_type;
41 typedef basic_istream<_CharT, _Traits> istream_type;
42
43private:
44 mutable streambuf_type* __sbuf_;
45
46 class __proxy {
47 char_type __keep_;
48 streambuf_type* __sbuf_;
49 _LIBCPP_HIDE_FROM_ABI explicit __proxy(char_type __c, streambuf_type* __s) : __keep_(__c), __sbuf_(__s) {}
50 friend class istreambuf_iterator;
51
52 public:
53 _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return __keep_; }
54 };
55
56 _LIBCPP_HIDE_FROM_ABI bool __test_for_eof() const {
57 if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof()))
58 __sbuf_ = nullptr;
59 return __sbuf_ == nullptr;
60 }
61
62public:
63 _LIBCPP_HIDE_FROM_ABI istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {}
64 _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(istream_type& __s) _NOEXCEPT : __sbuf_(__s.rdbuf()) {}
65 _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(streambuf_type* __s) _NOEXCEPT : __sbuf_(__s) {}
66 _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(const __proxy& __p) _NOEXCEPT : __sbuf_(__p.__sbuf_) {}
67
68 _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return static_cast<char_type>(__sbuf_->sgetc()); }
69 _LIBCPP_HIDE_FROM_ABI istreambuf_iterator& operator++() {
70 __sbuf_->sbumpc();
71 return *this;
72 }
73 _LIBCPP_HIDE_FROM_ABI __proxy operator++(int) { return __proxy(__sbuf_->sbumpc(), __sbuf_); }
74
75 _LIBCPP_HIDE_FROM_ABI bool equal(const istreambuf_iterator& __b) const {
76 return __test_for_eof() == __b.__test_for_eof();
77 }
78};
79
80template <class _CharT, class _Traits>
81inline _LIBCPP_HIDE_FROM_ABI bool
82operator==(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) {
83 return __a.equal(__b);
84}
85
86template <class _CharT, class _Traits>
87inline _LIBCPP_HIDE_FROM_ABI bool
88operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) {
89 return !__a.equal(__b);
90}
91
92_LIBCPP_END_NAMESPACE_STD
93
94#endif // _LIBCPP___CXX03___ITERATOR_ISTREAMBUF_ITERATOR_H
95

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source code of libcxx/include/__cxx03/__iterator/istreambuf_iterator.h