1 /*
2 * Copyright (c) 1999
3 * Silicon Graphics Computer Systems, Inc.
4 *
5 * Copyright (c) 1999
6 * Boris Fomitchev
7 *
8 * This material is provided "as is", with absolutely no warranty expressed
9 * or implied. Any use is at your own risk.
10 *
11 * Permission to use or copy this software for any purpose is hereby granted
12 * without fee, provided the above notices are retained on all copies.
13 * Permission to modify the code and to distribute modified code is granted,
14 * provided the above notices are retained, and a notice that the code was
15 * modified is included with the above copyright notice.
16 *
17 */
18 // WARNING: This is an internal header file, included by other C++
19 // standard library headers. You should not attempt to use this header
20 // file directly.
21
22
23 #ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
24 #define _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
25
26 #ifndef _STLP_INTERNAL_ITERATOR_BASE_H
27 # include <stl/_iterator_base.h>
28 #endif
29
30 #ifndef _STLP_INTERNAL_STREAMBUF
31 # include <stl/_streambuf.h>
32 #endif
33
34 _STLP_BEGIN_NAMESPACE
35
36 // defined in _istream.h
37 template <class _CharT, class _Traits>
38 extern basic_streambuf<_CharT, _Traits>* _STLP_CALL _M_get_istreambuf(basic_istream<_CharT, _Traits>& ) ;
39
40 // We do not read any characters until operator* is called. operator* calls sgetc
41 // unless the iterator is unchanged from the last call in which case a cached value is
42 // used. Calls to operator++ use sbumpc.
43
44 template<class _CharT, class _Traits>
45 class istreambuf_iterator :
46 public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT&>
47 {
48 public:
49 typedef _CharT char_type;
50 typedef _Traits traits_type;
51 typedef typename _Traits::int_type int_type;
52 typedef basic_streambuf<_CharT, _Traits> streambuf_type;
53 typedef basic_istream<_CharT, _Traits> istream_type;
54
55 typedef input_iterator_tag iterator_category;
56 typedef _CharT value_type;
57 typedef typename _Traits::off_type difference_type;
58 typedef const _CharT* pointer;
59 typedef const _CharT& reference;
60
61 public:
62 istreambuf_iterator(streambuf_type* __p = 0) { this->_M_init(__p); }
63 // istreambuf_iterator(basic_istream<_CharT, _Traits>& __is) { this->_M_init(_M_get_istreambuf(__is)); }
64 inline istreambuf_iterator(basic_istream<_CharT, _Traits>& __is);
65
66 char_type operator*() const { this->_M_getc(); return _M_c; }
67 istreambuf_iterator<_CharT, _Traits>& operator++() {
68 _M_buf->sbumpc();
69 _M_have_c = false;
70 return *this;
71 }
72 istreambuf_iterator<_CharT, _Traits> operator++(int);
73
equal(const istreambuf_iterator<_CharT,_Traits> & __i)74 bool equal(const istreambuf_iterator<_CharT, _Traits>& __i) const {
75 if (this->_M_buf)
76 this->_M_getc();
77 if (__i._M_buf)
78 __i._M_getc();
79 return this->_M_eof == __i._M_eof;
80 }
81
82 private:
_M_init(streambuf_type * __p)83 void _M_init(streambuf_type* __p) {
84 _M_buf = __p;
85 _M_eof = (__p == 0);
86 _M_have_c = false;
87 }
88
_M_getc()89 void _M_getc() const {
90 if (_M_have_c)
91 return;
92 int_type __c = _M_buf->sgetc();
93 _STLP_MUTABLE(_Self, _M_c) = traits_type::to_char_type(__c);
94 _STLP_MUTABLE(_Self, _M_eof) = traits_type::eq_int_type(__c, traits_type::eof());
95 _STLP_MUTABLE(_Self, _M_have_c) = true;
96 }
97
98 private:
99 streambuf_type* _M_buf;
100 mutable _CharT _M_c;
101 mutable bool _M_eof;
102 mutable bool _M_have_c;
103 };
104
105 template<class _CharT, class _Traits>
istreambuf_iterator(basic_istream<_CharT,_Traits> & __is)106 inline istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator(basic_istream<_CharT, _Traits>& __is)
107 { this->_M_init(_M_get_istreambuf(__is)); }
108
109 template<class _CharT, class _Traits>
110 inline bool _STLP_CALL operator==(const istreambuf_iterator<_CharT, _Traits>& __x,
111 const istreambuf_iterator<_CharT, _Traits>& __y) {
112 return __x.equal(__y);
113 }
114
115 #ifdef _STLP_USE_SEPARATE_RELOPS_NAMESPACE
116
117 template<class _CharT, class _Traits>
118 inline bool _STLP_CALL operator!=(const istreambuf_iterator<_CharT, _Traits>& __x,
119 const istreambuf_iterator<_CharT, _Traits>& __y) {
120 return !__x.equal(__y);
121 }
122
123 #endif /* _STLP_USE_SEPARATE_RELOPS_NAMESPACE */
124
125 # if defined (_STLP_USE_TEMPLATE_EXPORT)
126 _STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<char, char_traits<char> >;
127 # if defined (INSTANTIATE_WIDE_STREAMS)
128 _STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<wchar_t, char_traits<wchar_t> >;
129 # endif
130 # endif /* _STLP_USE_TEMPLATE_EXPORT */
131
132 # ifdef _STLP_USE_OLD_HP_ITERATOR_QUERIES
133 template <class _CharT, class _Traits>
iterator_category(const istreambuf_iterator<_CharT,_Traits> &)134 inline input_iterator_tag _STLP_CALL iterator_category(const istreambuf_iterator<_CharT, _Traits>&) { return input_iterator_tag(); }
135 template <class _CharT, class _Traits>
136 inline streamoff* _STLP_CALL
distance_type(const istreambuf_iterator<_CharT,_Traits> &)137 distance_type(const istreambuf_iterator<_CharT, _Traits>&) { return (streamoff*)0; }
138 template <class _CharT, class _Traits>
value_type(const istreambuf_iterator<_CharT,_Traits> &)139 inline _CharT* _STLP_CALL value_type(const istreambuf_iterator<_CharT, _Traits>&) { return (_CharT*)0; }
140 # endif
141
142 template <class _CharT, class _Traits>
143 istreambuf_iterator<_CharT, _Traits>
144 istreambuf_iterator<_CharT, _Traits>::operator++(int) {
145 _M_getc(); // __tmp should avoid any future actions under
146 // underlined buffer---during call of operator *()
147 // (due to buffer for *this and __tmp are the same).
148 istreambuf_iterator<_CharT, _Traits> __tmp = *this;
149 _M_buf->sbumpc();
150 _M_have_c = false;
151 return __tmp;
152 }
153
154 _STLP_END_NAMESPACE
155
156 #endif /* _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H */
157
158 // Local Variables:
159 // mode:C++
160 // End:
161
162