LCOV - app.info - /tools/gcc-4.5/include/c++/4.5.2/bits/streambuf_iterator.h

LCOV - code coverage report
| Current view: | directory - tools/gcc-4.5/include/c++/4.5.2/bits - streambuf_iterator.h (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 8 | 0 | 0.0 %
| Date: | 2012-04-07 | Functions: | 4 | 0 | 0.0 %

           1                 : // Streambuf iterators
           2                 :
           3                 : // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
           4                 : // 2006, 2007, 2009
           5                 : // Free Software Foundation, Inc.
           6                 : //
           7                 : // This file is part of the GNU ISO C++ Library.  This library is free
           8                 : // software; you can redistribute it and/or modify it under the
           9                 : // terms of the GNU General Public License as published by the
          10                 : // Free Software Foundation; either version 3, or (at your option)
          11                 : // any later version.
          12                 :
          13                 : // This library is distributed in the hope that it will be useful,
          14                 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
          15                 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
          16                 : // GNU General Public License for more details.
          17                 :
          18                 : // Under Section 7 of GPL version 3, you are granted additional
          19                 : // permissions described in the GCC Runtime Library Exception, version
          20                 : // 3.1, as published by the Free Software Foundation.
          21                 :
          22                 : // You should have received a copy of the GNU General Public License and
          23                 : // a copy of the GCC Runtime Library Exception along with this program;
          24                 : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
          25                 : // <http://www.gnu.org/licenses/>.
          26                 :
          27                 : /** @file streambuf_iterator.h
          28                 :  *  This is an internal header file, included by other library headers.
          29                 :  *  You should not attempt to use it directly.
          30                 :  */
          31                 :
          32                 : #ifndef _STREAMBUF_ITERATOR_H
          33                 : #define _STREAMBUF_ITERATOR_H 1
          34                 :
          35                 : #pragma GCC system_header
          36                 :
          37                 : #include <streambuf>
          38                 : #include <debug/debug.h>
          39                 :
          40                 : _GLIBCXX_BEGIN_NAMESPACE(std)
          41                 :
          42                 :   /**
          43                 :    * @addtogroup iterators
          44                 :    * @{
          45                 :    */
          46                 :
          47                 :   // 24.5.3 Template class istreambuf_iterator
          48                 :   /// Provides input iterator semantics for streambufs.
          49                 :   template<typename _CharT, typename _Traits>
          50                 :     class istreambuf_iterator
          51                 :     : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
          52                 :                       _CharT*, _CharT&>
          53                 :     {
          54                 :     public:
          55                 :       // Types:
          56                 :       //@{
          57                 :       /// Public typedefs
          58                 :       typedef _CharT                                    char_type;
          59                 :       typedef _Traits                                   traits_type;
          60                 :       typedef typename _Traits::int_type                int_type;
          61                 :       typedef basic_streambuf<_CharT, _Traits>            streambuf_type;
          62                 :       typedef basic_istream<_CharT, _Traits>              istream_type;
          63                 :       //@}
          64                 :
          65                 :       template<typename _CharT2>
          66                 :         friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
          67                 :                                     ostreambuf_iterator<_CharT2> >::__type
          68                 :         copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
          69                 :              ostreambuf_iterator<_CharT2>);
          70                 :
          71                 :       template<bool _IsMove, typename _CharT2>
          72                 :         friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
          73                 :                                                _CharT2*>::__type
          74                 :         __copy_move_a2(istreambuf_iterator<_CharT2>,
          75                 :                        istreambuf_iterator<_CharT2>, _CharT2*);
          76                 :
          77                 :       template<typename _CharT2>
          78                 :         friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
          79                 :                                     istreambuf_iterator<_CharT2> >::__type
          80                 :         find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
          81                 :              const _CharT2&);
          82                 :
          83                 :     private:
          84                 :       // 24.5.3 istreambuf_iterator
          85                 :       // p 1
          86                 :       // If the end of stream is reached (streambuf_type::sgetc()
          87                 :       // returns traits_type::eof()), the iterator becomes equal to
          88                 :       // the "end of stream" iterator value.
          89                 :       // NB: This implementation assumes the "end of stream" value
          90                 :       // is EOF, or -1.
          91                 :       mutable streambuf_type*   _M_sbuf;
          92                 :       mutable int_type          _M_c;
          93                 :
          94                 :     public:
          95                 :       ///  Construct end of input stream iterator.
          96                 :       istreambuf_iterator() throw()
          97                 :       : _M_sbuf(0), _M_c(traits_type::eof()) { }
          98                 :
          99                 :       ///  Construct start of input stream iterator.
         100               0 :       istreambuf_iterator(istream_type& __s) throw()
         101               0 :       : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
         102                 :
         103                 :       ///  Construct start of streambuf iterator.
         104               0 :       istreambuf_iterator(streambuf_type* __s) throw()
         105               0 :       : _M_sbuf(__s), _M_c(traits_type::eof()) { }
         106                 :
         107                 :       ///  Return the current character pointed to by iterator.  This returns
         108                 :       ///  streambuf.sgetc().  It cannot be assigned.  NB: The result of
         109                 :       ///  operator*() on an end of stream is undefined.
         110                 :       char_type
         111                 :       operator*() const
         112                 :       {
         113                 : #ifdef _GLIBCXX_DEBUG_PEDANTIC
         114                 :         // Dereferencing a past-the-end istreambuf_iterator is a
         115                 :         // libstdc++ extension
         116                 :         __glibcxx_requires_cond(!_M_at_eof(),
         117                 :                                 _M_message(__gnu_debug::__msg_deref_istreambuf)
         118                 :                                 ._M_iterator(*this));
         119                 : #endif
         120                 :         return traits_type::to_char_type(_M_get());
         121                 :       }
         122                 :
         123                 :       /// Advance the iterator.  Calls streambuf.sbumpc().
         124                 :       istreambuf_iterator&
         125                 :       operator++()
         126                 :       {
         127                 :         __glibcxx_requires_cond(!_M_at_eof(),
         128                 :                                 _M_message(__gnu_debug::__msg_inc_istreambuf)
         129                 :                                 ._M_iterator(*this));
         130                 :         if (_M_sbuf)
         131                 :           {
         132                 :             _M_sbuf->sbumpc();
         133                 :             _M_c = traits_type::eof();
         134                 :           }
         135                 :         return *this;
         136                 :       }
         137                 :
         138                 :       /// Advance the iterator.  Calls streambuf.sbumpc().
         139                 :       istreambuf_iterator
         140                 :       operator++(int)
         141                 :       {
         142                 :         __glibcxx_requires_cond(!_M_at_eof(),
         143                 :                                 _M_message(__gnu_debug::__msg_inc_istreambuf)
         144                 :                                 ._M_iterator(*this));
         145                 :
         146                 :         istreambuf_iterator __old = *this;
         147                 :         if (_M_sbuf)
         148                 :           {
         149                 :             __old._M_c = _M_sbuf->sbumpc();
         150                 :             _M_c = traits_type::eof();
         151                 :           }
         152                 :         return __old;
         153                 :       }
         154                 :
         155                 :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
         156                 :       // 110 istreambuf_iterator::equal not const
         157                 :       // NB: there is also number 111 (NAD, Future) pending on this function.
         158                 :       /// Return true both iterators are end or both are not end.
         159                 :       bool
         160                 :       equal(const istreambuf_iterator& __b) const
         161                 :       { return _M_at_eof() == __b._M_at_eof(); }
         162                 :
         163                 :     private:
         164                 :       int_type
         165                 :       _M_get() const
         166                 :       {
         167                 :         const int_type __eof = traits_type::eof();
         168                 :         int_type __ret = __eof;
         169                 :         if (_M_sbuf)
         170                 :           {
         171                 :             if (!traits_type::eq_int_type(_M_c, __eof))
         172                 :               __ret = _M_c;
         173                 :             else if (!traits_type::eq_int_type((__ret = _M_sbuf->sgetc()),
         174                 :                                                __eof))
         175                 :               _M_c = __ret;
         176                 :             else
         177                 :               _M_sbuf = 0;
         178                 :           }
         179                 :         return __ret;
         180                 :       }
         181                 :
         182                 :       bool
         183                 :       _M_at_eof() const
         184                 :       {
         185                 :         const int_type __eof = traits_type::eof();
         186                 :         return traits_type::eq_int_type(_M_get(), __eof);
         187                 :       }
         188                 :     };
         189                 :
         190                 :   template<typename _CharT, typename _Traits>
         191                 :     inline bool
         192                 :     operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
         193                 :                const istreambuf_iterator<_CharT, _Traits>& __b)
         194                 :     { return __a.equal(__b); }
         195                 :
         196                 :   template<typename _CharT, typename _Traits>
         197                 :     inline bool
         198                 :     operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
         199                 :                const istreambuf_iterator<_CharT, _Traits>& __b)
         200                 :     { return !__a.equal(__b); }
         201                 :
         202                 :   /// Provides output iterator semantics for streambufs.
         203                 :   template<typename _CharT, typename _Traits>
         204                 :     class ostreambuf_iterator
         205                 :     : public iterator<output_iterator_tag, void, void, void, void>
         206                 :     {
         207                 :     public:
         208                 :       // Types:
         209                 :       //@{
         210                 :       /// Public typedefs
         211                 :       typedef _CharT                           char_type;
         212                 :       typedef _Traits                          traits_type;
         213                 :       typedef basic_streambuf<_CharT, _Traits> streambuf_type;
         214                 :       typedef basic_ostream<_CharT, _Traits>   ostream_type;
         215                 :       //@}
         216                 :
         217                 :       template<typename _CharT2>
         218                 :         friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
         219                 :                                     ostreambuf_iterator<_CharT2> >::__type
         220                 :         copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
         221                 :              ostreambuf_iterator<_CharT2>);
         222                 :
         223                 :     private:
         224                 :       streambuf_type*   _M_sbuf;
         225                 :       bool              _M_failed;
         226                 :
         227                 :     public:
         228                 :       ///  Construct output iterator from ostream.
         229               0 :       ostreambuf_iterator(ostream_type& __s) throw ()
         230               0 :       : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
         231                 :
         232                 :       ///  Construct output iterator from streambuf.
         233                 :       ostreambuf_iterator(streambuf_type* __s) throw ()
         234                 :       : _M_sbuf(__s), _M_failed(!_M_sbuf) { }
         235                 :
         236                 :       ///  Write character to streambuf.  Calls streambuf.sputc().
         237                 :       ostreambuf_iterator&
         238                 :       operator=(_CharT __c)
         239                 :       {
         240                 :         if (!_M_failed &&
         241                 :             _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
         242                 :           _M_failed = true;
         243                 :         return *this;
         244                 :       }
         245                 :
         246                 :       /// Return *this.
         247                 :       ostreambuf_iterator&
         248                 :       operator*()
         249                 :       { return *this; }
         250                 :
         251                 :       /// Return *this.
         252                 :       ostreambuf_iterator&
         253                 :       operator++(int)
         254                 :       { return *this; }
         255                 :
         256                 :       /// Return *this.
         257                 :       ostreambuf_iterator&
         258                 :       operator++()
         259                 :       { return *this; }
         260                 :
         261                 :       /// Return true if previous operator=() failed.
         262                 :       bool
         263               0 :       failed() const throw()
         264               0 :       { return _M_failed; }
         265                 :
         266                 :       ostreambuf_iterator&
         267                 :       _M_put(const _CharT* __ws, streamsize __len)
         268                 :       {
         269                 :         if (__builtin_expect(!_M_failed, true)
         270                 :             && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
         271                 :                                 false))
         272                 :           _M_failed = true;
         273                 :         return *this;
         274                 :       }
         275                 :     };
         276                 :
         277                 :   // Overloads for streambuf iterators.
         278                 :   template<typename _CharT>
         279                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
         280                 :                                     ostreambuf_iterator<_CharT> >::__type
         281                 :     copy(istreambuf_iterator<_CharT> __first,
         282                 :          istreambuf_iterator<_CharT> __last,
         283                 :          ostreambuf_iterator<_CharT> __result)
         284                 :     {
         285                 :       if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)
         286                 :         {
         287                 :           bool __ineof;
         288                 :           __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);
         289                 :           if (!__ineof)
         290                 :             __result._M_failed = true;
         291                 :         }
         292                 :       return __result;
         293                 :     }
         294                 :
         295                 :   template<bool _IsMove, typename _CharT>
         296                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
         297                 :                                     ostreambuf_iterator<_CharT> >::__type
         298                 :     __copy_move_a2(_CharT* __first, _CharT* __last,
         299                 :                    ostreambuf_iterator<_CharT> __result)
         300                 :     {
         301                 :       const streamsize __num = __last - __first;
         302                 :       if (__num > 0)
         303                 :         __result._M_put(__first, __num);
         304                 :       return __result;
         305                 :     }
         306                 :
         307                 :   template<bool _IsMove, typename _CharT>
         308                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
         309                 :                                     ostreambuf_iterator<_CharT> >::__type
         310                 :     __copy_move_a2(const _CharT* __first, const _CharT* __last,
         311                 :                    ostreambuf_iterator<_CharT> __result)
         312                 :     {
         313                 :       const streamsize __num = __last - __first;
         314                 :       if (__num > 0)
         315                 :         __result._M_put(__first, __num);
         316                 :       return __result;
         317                 :     }
         318                 :
         319                 :   template<bool _IsMove, typename _CharT>
         320                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
         321                 :                                     _CharT*>::__type
         322                 :     __copy_move_a2(istreambuf_iterator<_CharT> __first,
         323                 :                    istreambuf_iterator<_CharT> __last, _CharT* __result)
         324                 :     {
         325                 :       typedef istreambuf_iterator<_CharT>                  __is_iterator_type;
         326                 :       typedef typename __is_iterator_type::traits_type     traits_type;
         327                 :       typedef typename __is_iterator_type::streambuf_type  streambuf_type;
         328                 :       typedef typename traits_type::int_type               int_type;
         329                 :
         330                 :       if (__first._M_sbuf && !__last._M_sbuf)
         331                 :         {
         332                 :           streambuf_type* __sb = __first._M_sbuf;
         333                 :           int_type __c = __sb->sgetc();
         334                 :           while (!traits_type::eq_int_type(__c, traits_type::eof()))
         335                 :             {
         336                 :               const streamsize __n = __sb->egptr() - __sb->gptr();
         337                 :               if (__n > 1)
         338                 :                 {
         339                 :                   traits_type::copy(__result, __sb->gptr(), __n);
         340                 :                   __sb->gbump(__n);
         341                 :                   __result += __n;
         342                 :                   __c = __sb->underflow();
         343                 :                 }
         344                 :               else
         345                 :                 {
         346                 :                   *__result++ = traits_type::to_char_type(__c);
         347                 :                   __c = __sb->snextc();
         348                 :                 }
         349                 :             }
         350                 :         }
         351                 :       return __result;
         352                 :     }
         353                 :
         354                 :   template<typename _CharT>
         355                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
         356                 :                                     istreambuf_iterator<_CharT> >::__type
         357                 :     find(istreambuf_iterator<_CharT> __first,
         358                 :          istreambuf_iterator<_CharT> __last, const _CharT& __val)
         359                 :     {
         360                 :       typedef istreambuf_iterator<_CharT>                  __is_iterator_type;
         361                 :       typedef typename __is_iterator_type::traits_type     traits_type;
         362                 :       typedef typename __is_iterator_type::streambuf_type  streambuf_type;
         363                 :       typedef typename traits_type::int_type               int_type;
         364                 :
         365                 :       if (__first._M_sbuf && !__last._M_sbuf)
         366                 :         {
         367                 :           const int_type __ival = traits_type::to_int_type(__val);
         368                 :           streambuf_type* __sb = __first._M_sbuf;
         369                 :           int_type __c = __sb->sgetc();
         370                 :           while (!traits_type::eq_int_type(__c, traits_type::eof())
         371                 :                  && !traits_type::eq_int_type(__c, __ival))
         372                 :             {
         373                 :               streamsize __n = __sb->egptr() - __sb->gptr();
         374                 :               if (__n > 1)
         375                 :                 {
         376                 :                   const _CharT* __p = traits_type::find(__sb->gptr(),
         377                 :                                                         __n, __val);
         378                 :                   if (__p)
         379                 :                     __n = __p - __sb->gptr();
         380                 :                   __sb->gbump(__n);
         381                 :                   __c = __sb->sgetc();
         382                 :                 }
         383                 :               else
         384                 :                 __c = __sb->snextc();
         385                 :             }
         386                 :
         387                 :           if (!traits_type::eq_int_type(__c, traits_type::eof()))
         388                 :             __first._M_c = __c;
         389                 :           else
         390                 :             __first._M_sbuf = 0;
         391                 :         }
         392                 :       return __first;
         393                 :     }
         394                 :
         395                 : // @} group iterators
         396                 :
         397                 : _GLIBCXX_END_NAMESPACE
         398                 :
         399                 : #endif

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