reactos/include/c++/stlport/stl/_stream_iterator.h

   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
 108   istream_iterator() : _M_stream(0), _M_ok(false), _M_read_done(true) {}
 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
 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
 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
 177   ostream_iterator(ostream_type& __s) : _M_stream(&__s), _M_string(0) {}
 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
 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
 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
 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
 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
 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
 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: