1 /*
2 *
3 * Copyright (c) 1994
4 * Hewlett-Packard Company
5 *
6 * Copyright (c) 1996-1998
7 * Silicon Graphics Computer Systems, Inc.
8 *
9 * Copyright (c) 1997
10 * Moscow Center for SPARC Technology
11 *
12 * Copyright (c) 1999
13 * Boris Fomitchev
14 *
15 * This material is provided "as is", with absolutely no warranty expressed
16 * or implied. Any use is at your own risk.
17 *
18 * Permission to use or copy this software for any purpose is hereby granted
19 * without fee, provided the above notices are retained on all copies.
20 * Permission to modify the code and to distribute modified code is granted,
21 * provided the above notices are retained, and a notice that the code was
22 * modified is included with the above copyright notice.
23 *
24 */
25
26 /* NOTE: This is an internal header file, included by other STL headers.
27 * You should not attempt to use it directly.
28 */
29
30 #if !defined (_STLP_INTERNAL_STREAM_ITERATOR_H) && !defined (_STLP_USE_NO_IOSTREAMS)
31 #define _STLP_INTERNAL_STREAM_ITERATOR_H
32
33 #ifndef _STLP_INTERNAL_ITERATOR_BASE_H
34 # include <stl/_iterator_base.h>
35 #endif
36
37 // streambuf_iterators predeclarations must appear first
38 #ifndef _STLP_INTERNAL_IOSFWD
39 # include <stl/_iosfwd.h>
40 #endif
41
42 #ifndef _STLP_INTERNAL_ALGOBASE_H
43 # include <stl/_algobase.h>
44 #endif
45
46 #ifndef _STLP_INTERNAL_OSTREAMBUF_ITERATOR_H
47 # include <stl/_ostreambuf_iterator.h>
48 #endif
49
50 #ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
51 # include <stl/_istreambuf_iterator.h>
52 #endif
53
54 #ifndef _STLP_INTERNAL_ISTREAM
55 # include <stl/_istream.h>
56 #endif
57
58 // istream_iterator and ostream_iterator look very different if we're
59 // using new, templatized iostreams than if we're using the old cfront
60 // version.
61
62 _STLP_BEGIN_NAMESPACE
63
64 #if !defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
65 # define __ISI_TMPL_HEADER_ARGUMENTS class _Tp, class _CharT, class _Traits, class _Dist
66 # define __ISI_TMPL_ARGUMENTS _Tp, _CharT, _Traits, _Dist
67 template <class _Tp,
68 class _CharT = char, class _Traits = char_traits<_CharT>,
69 class _Dist = ptrdiff_t>
70 class istream_iterator : public iterator<input_iterator_tag, _Tp , _Dist,
71 const _Tp*, const _Tp& > {
72 #else
73 # if defined (_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS) && !defined (_STLP_DEFAULT_TYPE_PARAM)
74 # define __ISI_TMPL_HEADER_ARGUMENTS class _Tp
75 # define __ISI_TMPL_ARGUMENTS _Tp
76 template <class _Tp>
77 class istream_iterator : public iterator<input_iterator_tag, _Tp , ptrdiff_t,
78 const _Tp*, const _Tp& > {
79 # else
80 # define __ISI_TMPL_HEADER_ARGUMENTS class _Tp, class _Dist
81 # define __ISI_TMPL_ARGUMENTS _Tp, _Dist
82 template <class _Tp, _STLP_DFL_TYPE_PARAM(_Dist, ptrdiff_t)>
83 class istream_iterator : public iterator<input_iterator_tag, _Tp, _Dist ,
84 const _Tp*, const _Tp& > {
85 # endif /* _STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS */
86 #endif /* _STLP_LIMITED_DEFAULT_TEMPLATES */
87
88 #if defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
89 typedef char _CharT;
90 typedef char_traits<char> _Traits;
91 # if defined (_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS) && !defined (_STLP_DEFAULT_TYPE_PARAM)
92 typedef ptrdiff_t _Dist;
93 # endif
94 #endif
95
96 typedef istream_iterator< __ISI_TMPL_ARGUMENTS > _Self;
97 public:
98 typedef _CharT char_type;
99 typedef _Traits traits_type;
100 typedef basic_istream<_CharT, _Traits> istream_type;
101
102 typedef input_iterator_tag iterator_category;
103 typedef _Tp value_type;
104 typedef _Dist difference_type;
105 typedef const _Tp* pointer;
106 typedef const _Tp& reference;
107
istream_iterator()108 istream_iterator() : _M_stream(0), _M_ok(false), _M_read_done(true) {}
istream_iterator(istream_type & __s)109 istream_iterator(istream_type& __s) : _M_stream(&__s), _M_ok(false), _M_read_done(false) {}
110
111 reference operator*() const {
112 if (!_M_read_done) {
113 _M_read();
114 }
115 return _M_value;
116 }
117
118 _STLP_DEFINE_ARROW_OPERATOR
119
120 _Self& operator++() {
121 _M_read();
122 return *this;
123 }
124 _Self operator++(int) {
125 _Self __tmp = *this;
126 _M_read();
127 return __tmp;
128 }
129
_M_equal(const _Self & __x)130 bool _M_equal(const _Self& __x) const {
131 if (!_M_read_done) {
132 _M_read();
133 }
134 if (!__x._M_read_done) {
135 __x._M_read();
136 }
137 return (_M_ok == __x._M_ok) && (!_M_ok || _M_stream == __x._M_stream);
138 }
139
140 private:
141 istream_type* _M_stream;
142 mutable _Tp _M_value;
143 mutable bool _M_ok;
144 mutable bool _M_read_done;
145
_M_read()146 void _M_read() const {
147 _STLP_MUTABLE(_Self, _M_ok) = ((_M_stream != 0) && !_M_stream->fail());
148 if (_M_ok) {
149 *_M_stream >> _STLP_MUTABLE(_Self, _M_value);
150 _STLP_MUTABLE(_Self, _M_ok) = !_M_stream->fail();
151 }
152 _STLP_MUTABLE(_Self, _M_read_done) = true;
153 }
154 };
155
156 #if !defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
157 template <class _TpP,
158 class _CharT = char, class _Traits = char_traits<_CharT> >
159 #else
160 template <class _TpP>
161 #endif
162 class ostream_iterator: public iterator<output_iterator_tag, void, void, void, void> {
163 #if defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
164 typedef char _CharT;
165 typedef char_traits<char> _Traits;
166 typedef ostream_iterator<_TpP> _Self;
167 #else
168 typedef ostream_iterator<_TpP, _CharT, _Traits> _Self;
169 #endif
170 public:
171 typedef _CharT char_type;
172 typedef _Traits traits_type;
173 typedef basic_ostream<_CharT, _Traits> ostream_type;
174
175 typedef output_iterator_tag iterator_category;
176
ostream_iterator(ostream_type & __s)177 ostream_iterator(ostream_type& __s) : _M_stream(&__s), _M_string(0) {}
ostream_iterator(ostream_type & __s,const _CharT * __c)178 ostream_iterator(ostream_type& __s, const _CharT* __c)
179 : _M_stream(&__s), _M_string(__c) {}
180 _Self& operator=(const _TpP& __val) {
181 *_M_stream << __val;
182 if (_M_string) *_M_stream << _M_string;
183 return *this;
184 }
185 _Self& operator*() { return *this; }
186 _Self& operator++() { return *this; }
187 _Self& operator++(int) { return *this; }
188 private:
189 ostream_type* _M_stream;
190 const _CharT* _M_string;
191 };
192
193 #if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)
194 # if defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
195 template <class _TpP>
196 inline output_iterator_tag _STLP_CALL
iterator_category(const ostream_iterator<_TpP> &)197 iterator_category(const ostream_iterator<_TpP>&) { return output_iterator_tag(); }
198 # else
199 template <class _TpP, class _CharT, class _Traits>
200 inline output_iterator_tag _STLP_CALL
iterator_category(const ostream_iterator<_TpP,_CharT,_Traits> &)201 iterator_category(const ostream_iterator<_TpP, _CharT, _Traits>&) { return output_iterator_tag(); }
202 # endif
203 #endif
204
205 _STLP_END_NAMESPACE
206
207 // form-independent definiotion of stream iterators
208 _STLP_BEGIN_NAMESPACE
209
210 template < __ISI_TMPL_HEADER_ARGUMENTS >
211 inline bool _STLP_CALL
212 operator==(const istream_iterator< __ISI_TMPL_ARGUMENTS >& __x,
213 const istream_iterator< __ISI_TMPL_ARGUMENTS >& __y)
214 { return __x._M_equal(__y); }
215
216 #if defined (_STLP_USE_SEPARATE_RELOPS_NAMESPACE)
217 template < __ISI_TMPL_HEADER_ARGUMENTS >
218 inline bool _STLP_CALL
219 operator!=(const istream_iterator< __ISI_TMPL_ARGUMENTS >& __x,
220 const istream_iterator< __ISI_TMPL_ARGUMENTS >& __y)
221 { return !__x._M_equal(__y); }
222 #endif
223
224 #if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)
225 template < __ISI_TMPL_HEADER_ARGUMENTS >
226 inline input_iterator_tag _STLP_CALL
iterator_category(const istream_iterator<__ISI_TMPL_ARGUMENTS> &)227 iterator_category(const istream_iterator< __ISI_TMPL_ARGUMENTS >&)
228 { return input_iterator_tag(); }
229 template < __ISI_TMPL_HEADER_ARGUMENTS >
230 inline _Tp* _STLP_CALL
value_type(const istream_iterator<__ISI_TMPL_ARGUMENTS> &)231 value_type(const istream_iterator< __ISI_TMPL_ARGUMENTS >&) { return (_Tp*) 0; }
232
233 # if defined (_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS) && !defined (_STLP_DEFAULT_TYPE_PARAM)
234 template < __ISI_TMPL_HEADER_ARGUMENTS >
235 inline ptrdiff_t* _STLP_CALL
distance_type(const istream_iterator<__ISI_TMPL_ARGUMENTS> &)236 distance_type(const istream_iterator< __ISI_TMPL_ARGUMENTS >&) { return (ptrdiff_t*)0; }
237 # else
238 template < __ISI_TMPL_HEADER_ARGUMENTS >
239 inline _Dist* _STLP_CALL
distance_type(const istream_iterator<__ISI_TMPL_ARGUMENTS> &)240 distance_type(const istream_iterator< __ISI_TMPL_ARGUMENTS >&) { return (_Dist*)0; }
241 # endif /* _STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS */
242 #endif
243
244 _STLP_END_NAMESPACE
245
246 #undef __ISI_TMPL_HEADER_ARGUMENTS
247 #undef __ISI_TMPL_ARGUMENTS
248
249 #endif /* _STLP_INTERNAL_STREAM_ITERATOR_H */
250
251 // Local Variables:
252 // mode:C++
253 // End:
254