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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 |
26 | template <class _CharT, class _Traits> |
27 | class _LIBCPP_TEMPLATE_VIS istreambuf_iterator |
28 | : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT> { |
29 | _LIBCPP_SUPPRESS_DEPRECATED_POP |
30 | |
31 | public: |
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 | |
43 | private: |
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 | |
62 | public: |
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 | |
80 | template <class _CharT, class _Traits> |
81 | inline _LIBCPP_HIDE_FROM_ABI bool |
82 | operator==(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) { |
83 | return __a.equal(__b); |
84 | } |
85 | |
86 | template <class _CharT, class _Traits> |
87 | inline _LIBCPP_HIDE_FROM_ABI bool |
88 | operator!=(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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