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
37template <class _CharT, class _Traits>
38extern 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
44template<class _CharT, class _Traits>
45class istreambuf_iterator :
46  public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT&>
47{
48public:
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
61public:
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
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
82private:
83  void _M_init(streambuf_type* __p) {
84    _M_buf = __p;
85    _M_eof = (__p == 0);
86    _M_have_c = false;
87  }
88
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
98private:
99  streambuf_type* _M_buf;
100  mutable _CharT _M_c;
101  mutable bool _M_eof;
102  mutable bool _M_have_c;
103};
104
105template<class _CharT, class _Traits>
106inline istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator(basic_istream<_CharT, _Traits>& __is)
107{ this->_M_init(_M_get_istreambuf(__is)); }
108
109template<class _CharT, class _Traits>
110inline 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
117template<class _CharT, class _Traits>
118inline 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
133template <class _CharT, class _Traits>
134inline input_iterator_tag _STLP_CALL iterator_category(const istreambuf_iterator<_CharT, _Traits>&) { return input_iterator_tag(); }
135template <class _CharT, class _Traits>
136inline streamoff* _STLP_CALL
137distance_type(const istreambuf_iterator<_CharT, _Traits>&) { return (streamoff*)0; }
138template <class _CharT, class _Traits>
139inline _CharT* _STLP_CALL value_type(const istreambuf_iterator<_CharT, _Traits>&) { return (_CharT*)0; }
140# endif
141
142template <class _CharT, class _Traits>
143istreambuf_iterator<_CharT, _Traits>
144istreambuf_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