/home/ntakagi/work/STLport-5.1.5/stlport/stl/_stream_iterator.h Source File

00001 /*
00002  *
00003  * Copyright (c) 1994
00004  * Hewlett-Packard Company
00005  *
00006  * Copyright (c) 1996-1998
00007  * Silicon Graphics Computer Systems, Inc.
00008  *
00009  * Copyright (c) 1997
00010  * Moscow Center for SPARC Technology
00011  *
00012  * Copyright (c) 1999
00013  * Boris Fomitchev
00014  *
00015  * This material is provided "as is", with absolutely no warranty expressed
00016  * or implied. Any use is at your own risk.
00017  *
00018  * Permission to use or copy this software for any purpose is hereby granted
00019  * without fee, provided the above notices are retained on all copies.
00020  * Permission to modify the code and to distribute modified code is granted,
00021  * provided the above notices are retained, and a notice that the code was
00022  * modified is included with the above copyright notice.
00023  *
00024  */
00025 
00026 /* NOTE: This is an internal header file, included by other STL headers.
00027  *   You should not attempt to use it directly.
00028  */
00029 
00030 #if !defined (_STLP_INTERNAL_STREAM_ITERATOR_H) && !defined (_STLP_USE_NO_IOSTREAMS)
00031 #define _STLP_INTERNAL_STREAM_ITERATOR_H
00032 
00033 #ifndef _STLP_INTERNAL_ITERATOR_BASE_H
00034 #  include <stl/_iterator_base.h>
00035 #endif
00036 
00037 // streambuf_iterators predeclarations must appear first
00038 #ifndef _STLP_IOSFWD
00039 #  include <iosfwd>
00040 #endif
00041 
00042 #ifndef _STLP_INTERNAL_ALGOBASE_H
00043 #  include <stl/_algobase.h>
00044 #endif
00045 
00046 #ifndef _STLP_INTERNAL_OSTREAMBUF_ITERATOR_H
00047 #  include <stl/_ostreambuf_iterator.h>
00048 #endif
00049 
00050 #ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
00051 #  include <stl/_istreambuf_iterator.h>
00052 #endif
00053 
00054 #ifndef _STLP_INTERNAL_ISTREAM
00055 #  include <stl/_istream.h>
00056 #endif
00057 
00058 // istream_iterator and ostream_iterator look very different if we're
00059 // using new, templatized iostreams than if we're using the old cfront
00060 // version.
00061 
00062 _STLP_BEGIN_NAMESPACE
00063 
00064 #if !defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
00065 #  define __ISI_TMPL_HEADER_ARGUMENTS class _Tp, class _CharT, class _Traits, class _Dist
00066 #  define __ISI_TMPL_ARGUMENTS _Tp, _CharT, _Traits, _Dist
00067 template <class _Tp,
00068           class _CharT = _STLP_DEFAULTCHAR, class _Traits = char_traits<_CharT>,
00069           class _Dist = ptrdiff_t>
00070 class istream_iterator : public iterator<input_iterator_tag, _Tp , _Dist,
00071                                          const _Tp*, const _Tp& > {
00072 #else
00073 #  if defined (_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS) && !defined (_STLP_DEFAULT_TYPE_PARAM)
00074 #    define __ISI_TMPL_HEADER_ARGUMENTS class _Tp
00075 #    define __ISI_TMPL_ARGUMENTS        _Tp
00076 template <class _Tp>
00077 class istream_iterator : public iterator<input_iterator_tag, _Tp , ptrdiff_t,
00078                                          const _Tp*, const _Tp& > {
00079 #  else
00080 #    define __ISI_TMPL_HEADER_ARGUMENTS class _Tp, class _Dist
00081 #    define __ISI_TMPL_ARGUMENTS        _Tp, _Dist
00082 template <class _Tp, _STLP_DFL_TYPE_PARAM(_Dist, ptrdiff_t)>
00083 class istream_iterator : public iterator<input_iterator_tag, _Tp, _Dist ,
00084                                          const _Tp*, const _Tp& > {
00085 #  endif /* _STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS */
00086 #endif /* _STLP_LIMITED_DEFAULT_TEMPLATES */
00087 
00088 #if defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
00089   typedef char _CharT;
00090   typedef char_traits<char> _Traits;
00091 #  if defined (_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS) && !defined (_STLP_DEFAULT_TYPE_PARAM)
00092   typedef ptrdiff_t _Dist;
00093 #  endif
00094 #endif
00095 
00096   typedef istream_iterator< __ISI_TMPL_ARGUMENTS > _Self;
00097 public:
00098   typedef _CharT                         char_type;
00099   typedef _Traits                        traits_type;
00100   typedef basic_istream<_CharT, _Traits> istream_type;
00101 
00102   typedef input_iterator_tag             iterator_category;
00103   typedef _Tp                            value_type;
00104   typedef _Dist                          difference_type;
00105   typedef const _Tp*                     pointer;
00106   typedef const _Tp&                     reference;
00107 
00108   istream_iterator() : _M_stream(0), _M_ok(false), _M_read_done(true) {}
00109   istream_iterator(istream_type& __s) : _M_stream(&__s), _M_ok(false), _M_read_done(false) {}
00110 
00111   reference operator*() const {
00112     if (!_M_read_done) {
00113       _M_read();
00114     }
00115     return _M_value;
00116   }
00117 
00118   _STLP_DEFINE_ARROW_OPERATOR
00119 
00120   _Self& operator++() {
00121     _M_read();
00122     return *this;
00123   }
00124   _Self operator++(int)  {
00125     _Self __tmp = *this;
00126     _M_read();
00127     return __tmp;
00128   }
00129 
00130   bool _M_equal(const _Self& __x) const {
00131     if (!_M_read_done) {
00132       _M_read();
00133     }
00134     if (!__x._M_read_done) {
00135       __x._M_read();
00136     }
00137     return (_M_ok == __x._M_ok) && (!_M_ok || _M_stream == __x._M_stream);
00138   }
00139 
00140 private:
00141   istream_type* _M_stream;
00142   mutable _Tp _M_value;
00143   mutable bool _M_ok;
00144   mutable bool _M_read_done;
00145 
00146   void _M_read() const {
00147     _M_ok = ((_M_stream != 0) && !_M_stream->fail());
00148     if (_M_ok) {
00149       *_M_stream >> _M_value;
00150       _M_ok = !_M_stream->fail();
00151     }
00152     _M_read_done = true;
00153   }
00154 };
00155 
00156 #if !defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
00157 template <class _TpP,
00158           class _CharT = _STLP_DEFAULTCHAR, class _Traits = char_traits<_CharT> >
00159 #else
00160 template <class _TpP>
00161 #endif
00162 class ostream_iterator: public iterator<output_iterator_tag, void, void, void, void> {
00163 #if defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
00164   typedef char _CharT;
00165   typedef char_traits<char> _Traits;
00166   typedef ostream_iterator<_TpP> _Self;
00167 #else
00168   typedef ostream_iterator<_TpP, _CharT, _Traits> _Self;
00169 #endif
00170 public:
00171   typedef _CharT                         char_type;
00172   typedef _Traits                        traits_type;
00173   typedef basic_ostream<_CharT, _Traits> ostream_type;
00174 
00175   typedef output_iterator_tag            iterator_category;
00176 
00177   ostream_iterator(ostream_type& __s) : _M_stream(&__s), _M_string(0) {}
00178   ostream_iterator(ostream_type& __s, const _CharT* __c)
00179     : _M_stream(&__s), _M_string(__c)  {}
00180   _Self& operator=(const _TpP& __val) {
00181     *_M_stream << __val;
00182     if (_M_string) *_M_stream << _M_string;
00183     return *this;
00184   }
00185   _Self& operator*() { return *this; }
00186   _Self& operator++() { return *this; }
00187   _Self& operator++(int) { return *this; }
00188 private:
00189   ostream_type* _M_stream;
00190   const _CharT* _M_string;
00191 };
00192 
00193 #if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)
00194 #  if defined (_STLP_LIMITED_DEFAULT_TEMPLATES)
00195 template <class _TpP>
00196 inline output_iterator_tag _STLP_CALL
00197 iterator_category(const ostream_iterator<_TpP>&) { return output_iterator_tag(); }
00198 #  else
00199 template <class _TpP, class _CharT, class _Traits>
00200 inline output_iterator_tag _STLP_CALL
00201 iterator_category(const ostream_iterator<_TpP, _CharT, _Traits>&) { return output_iterator_tag(); }
00202 #  endif
00203 #endif
00204 
00205 _STLP_END_NAMESPACE
00206 
00207 // form-independent definiotion of stream iterators
00208 _STLP_BEGIN_NAMESPACE
00209 
00210 template < __ISI_TMPL_HEADER_ARGUMENTS >
00211 inline bool _STLP_CALL
00212 operator==(const istream_iterator< __ISI_TMPL_ARGUMENTS >& __x,
00213            const istream_iterator< __ISI_TMPL_ARGUMENTS >& __y)
00214 { return __x._M_equal(__y); }
00215 
00216 #if defined (_STLP_USE_SEPARATE_RELOPS_NAMESPACE)
00217 template < __ISI_TMPL_HEADER_ARGUMENTS >
00218 inline bool _STLP_CALL
00219 operator!=(const istream_iterator< __ISI_TMPL_ARGUMENTS >& __x,
00220            const istream_iterator< __ISI_TMPL_ARGUMENTS >& __y)
00221 { return !__x._M_equal(__y); }
00222 #endif
00223 
00224 #if defined (_STLP_USE_OLD_HP_ITERATOR_QUERIES)
00225 template < __ISI_TMPL_HEADER_ARGUMENTS >
00226 inline input_iterator_tag _STLP_CALL
00227 iterator_category(const istream_iterator< __ISI_TMPL_ARGUMENTS >&)
00228 { return input_iterator_tag(); }
00229 template < __ISI_TMPL_HEADER_ARGUMENTS >
00230 inline _Tp* _STLP_CALL
00231 value_type(const istream_iterator< __ISI_TMPL_ARGUMENTS >&) { return (_Tp*) 0; }
00232 
00233 #  if defined (_STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS) && !defined (_STLP_DEFAULT_TYPE_PARAM)
00234 template < __ISI_TMPL_HEADER_ARGUMENTS >
00235 inline ptrdiff_t* _STLP_CALL
00236 distance_type(const istream_iterator< __ISI_TMPL_ARGUMENTS >&) { return (ptrdiff_t*)0; }
00237 #  else
00238 template < __ISI_TMPL_HEADER_ARGUMENTS >
00239 inline _Dist* _STLP_CALL
00240 distance_type(const istream_iterator< __ISI_TMPL_ARGUMENTS >&) { return (_Dist*)0; }
00241 #  endif /* _STLP_MINIMUM_DEFAULT_TEMPLATE_PARAMS */
00242 #endif
00243 
00244 _STLP_END_NAMESPACE
00245 
00246 #undef __ISI_TMPL_HEADER_ARGUMENTS
00247 #undef __ISI_TMPL_ARGUMENTS
00248 
00249 #endif /* _STLP_INTERNAL_STREAM_ITERATOR_H */
00250 
00251 // Local Variables:
00252 // mode:C++
00253 // End: