/project/jni/stlport/stlport/stl/_istreambuf_iterator.h

  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      {
 69        _M_buf->sbumpc();
 70        _M_have_c = false;
 71        return *this;
 72      }
 73  istreambuf_iterator<_CharT, _Traits>  operator++(int);
 74
 75  bool equal(const istreambuf_iterator<_CharT, _Traits>& __i) const {
 76    if (this->_M_buf)
 77      this->_M_getc();
 78    if (__i._M_buf)
 79      __i._M_getc();
 80    return this->_M_eof == __i._M_eof;
 81  }
 82
 83private:
 84  void _M_init(streambuf_type* __p) {
 85    _M_buf = __p;
 86    _M_eof = (__p == 0);
 87    _M_have_c = false;
 88  }
 89
 90  void _M_getc() const {
 91    if (_M_have_c)
 92      return;
 93    int_type __c = _M_buf->sgetc();
 94# if !defined (_STLP_NEED_MUTABLE) /* && ! defined (__SUNPRO_CC) */
 95    _M_c = traits_type::to_char_type(__c);
 96    _M_eof = traits_type::eq_int_type(__c, traits_type::eof());
 97    _M_have_c = true;
 98# else
 99    typedef istreambuf_iterator<_CharT,_Traits> _Self;
100    _Self* __that = __CONST_CAST(_Self*, this);
101    __that->_M_c = __STATIC_CAST(_CharT, traits_type::to_char_type(__c));
102    __that->_M_eof = traits_type::eq_int_type(__c, traits_type::eof());
103    __that->_M_have_c = true;
104# endif
105  }
106
107private:
108  streambuf_type* _M_buf;
109  mutable _CharT _M_c;
110  mutable bool _M_eof;
111  mutable bool _M_have_c;
112};
113
114template<class _CharT, class _Traits>
115inline istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator(basic_istream<_CharT, _Traits>& __is)
116{ this->_M_init(_M_get_istreambuf(__is)); }
117
118template<class _CharT, class _Traits>
119inline bool _STLP_CALL operator==(const istreambuf_iterator<_CharT, _Traits>& __x,
120                                  const istreambuf_iterator<_CharT, _Traits>& __y) {
121  return __x.equal(__y);
122}
123
124#ifdef _STLP_USE_SEPARATE_RELOPS_NAMESPACE
125
126template<class _CharT, class _Traits>
127inline bool _STLP_CALL operator!=(const istreambuf_iterator<_CharT, _Traits>& __x,
128                                  const istreambuf_iterator<_CharT, _Traits>& __y) {
129  return !__x.equal(__y);
130}
131
132#endif /* _STLP_USE_SEPARATE_RELOPS_NAMESPACE */
133
134# if defined (_STLP_USE_TEMPLATE_EXPORT)
135_STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<char, char_traits<char> >;
136#  if defined (INSTANTIATE_WIDE_STREAMS)
137_STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<wchar_t, char_traits<wchar_t> >;
138#  endif
139# endif /* _STLP_USE_TEMPLATE_EXPORT */
140
141# ifdef _STLP_USE_OLD_HP_ITERATOR_QUERIES
142template <class _CharT, class _Traits>
143inline input_iterator_tag _STLP_CALL iterator_category(const istreambuf_iterator<_CharT, _Traits>&) { return input_iterator_tag(); }
144template <class _CharT, class _Traits>
145inline streamoff* _STLP_CALL
146distance_type(const istreambuf_iterator<_CharT, _Traits>&) { return (streamoff*)0; }
147template <class _CharT, class _Traits>
148inline _CharT* _STLP_CALL value_type(const istreambuf_iterator<_CharT, _Traits>&) { return (_CharT*)0; }
149# endif
150
151template <class _CharT, class _Traits>
152istreambuf_iterator<_CharT, _Traits>
153istreambuf_iterator<_CharT, _Traits>::operator++(int) {
154  _M_getc(); // __tmp should avoid any future actions under
155  // underlined buffer---during call of operator *()
156  // (due to buffer for *this and __tmp are the same).
157  istreambuf_iterator<_CharT, _Traits> __tmp = *this;
158  _M_buf->sbumpc();
159  _M_have_c = false;
160  return __tmp;
161}
162
163_STLP_END_NAMESPACE
164
165#endif /* _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H */
166
167// Local Variables:
168// mode:C++
169// End:
170