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

LCOV - code coverage report
| Current view: | directory - tools/gcc-4.5/include/c++/4.5.2/bits - stl_tempbuf.h (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 28 | 0 | 0.0 %
| Date: | 2012-04-07 | Functions: | 6 | 0 | 0.0 %

           1                 : // Temporary buffer implementation -*- C++ -*-
           2                 :
           3                 : // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
           4                 : // Free Software Foundation, Inc.
           5                 : //
           6                 : // This file is part of the GNU ISO C++ Library.  This library is free
           7                 : // software; you can redistribute it and/or modify it under the
           8                 : // terms of the GNU General Public License as published by the
           9                 : // Free Software Foundation; either version 3, or (at your option)
          10                 : // any later version.
          11                 :
          12                 : // This library is distributed in the hope that it will be useful,
          13                 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
          14                 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
          15                 : // GNU General Public License for more details.
          16                 :
          17                 : // Under Section 7 of GPL version 3, you are granted additional
          18                 : // permissions described in the GCC Runtime Library Exception, version
          19                 : // 3.1, as published by the Free Software Foundation.
          20                 :
          21                 : // You should have received a copy of the GNU General Public License and
          22                 : // a copy of the GCC Runtime Library Exception along with this program;
          23                 : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
          24                 : // <http://www.gnu.org/licenses/>.
          25                 :
          26                 : /*
          27                 :  *
          28                 :  * Copyright (c) 1994
          29                 :  * Hewlett-Packard Company
          30                 :  *
          31                 :  * Permission to use, copy, modify, distribute and sell this software
          32                 :  * and its documentation for any purpose is hereby granted without fee,
          33                 :  * provided that the above copyright notice appear in all copies and
          34                 :  * that both that copyright notice and this permission notice appear
          35                 :  * in supporting documentation.  Hewlett-Packard Company makes no
          36                 :  * representations about the suitability of this software for any
          37                 :  * purpose.  It is provided "as is" without express or implied warranty.
          38                 :  *
          39                 :  *
          40                 :  * Copyright (c) 1996,1997
          41                 :  * Silicon Graphics Computer Systems, Inc.
          42                 :  *
          43                 :  * Permission to use, copy, modify, distribute and sell this software
          44                 :  * and its documentation for any purpose is hereby granted without fee,
          45                 :  * provided that the above copyright notice appear in all copies and
          46                 :  * that both that copyright notice and this permission notice appear
          47                 :  * in supporting documentation.  Silicon Graphics makes no
          48                 :  * representations about the suitability of this software for any
          49                 :  * purpose.  It is provided "as is" without express or implied warranty.
          50                 :  */
          51                 :
          52                 : /** @file stl_tempbuf.h
          53                 :  *  This is an internal header file, included by other library headers.
          54                 :  *  You should not attempt to use it directly.
          55                 :  */
          56                 :
          57                 : #ifndef _STL_TEMPBUF_H
          58                 : #define _STL_TEMPBUF_H 1
          59                 :
          60                 : #include <bits/stl_algobase.h>
          61                 : #include <bits/stl_construct.h>
          62                 : #include <bits/stl_uninitialized.h>
          63                 :
          64                 : _GLIBCXX_BEGIN_NAMESPACE(std)
          65                 :
          66                 :   /**
          67                 :    *  @brief Allocates a temporary buffer.
          68                 :    *  @param  len  The number of objects of type Tp.
          69                 :    *  @return See full description.
          70                 :    *
          71                 :    *  Reinventing the wheel, but this time with prettier spokes!
          72                 :    *
          73                 :    *  This function tries to obtain storage for @c len adjacent Tp
          74                 :    *  objects.  The objects themselves are not constructed, of course.
          75                 :    *  A pair<> is returned containing <em>the buffer s address and
          76                 :    *  capacity (in the units of sizeof(Tp)), or a pair of 0 values if
          77                 :    *  no storage can be obtained.</em>  Note that the capacity obtained
          78                 :    *  may be less than that requested if the memory is unavailable;
          79                 :    *  you should compare len with the .second return value.
          80                 :    *
          81                 :    * Provides the nothrow exception guarantee.
          82                 :    */
          83                 :   template<typename _Tp>
          84                 :     pair<_Tp*, ptrdiff_t>
          85               0 :     get_temporary_buffer(ptrdiff_t __len)
          86                 :     {
          87                 :       const ptrdiff_t __max =
          88               0 :         __gnu_cxx::__numeric_traits<ptrdiff_t>::__max / sizeof(_Tp);
          89               0 :       if (__len > __max)
          90               0 :         __len = __max;
          91                 :
          92               0 :       while (__len > 0)
          93                 :         {
          94                 :           _Tp* __tmp = static_cast<_Tp*>(::operator new(__len * sizeof(_Tp),
          95               0 :                                                         std::nothrow));
          96               0 :           if (__tmp != 0)
          97               0 :             return std::pair<_Tp*, ptrdiff_t>(__tmp, __len);
          98               0 :           __len /= 2;
          99                 :         }
         100               0 :       return std::pair<_Tp*, ptrdiff_t>(static_cast<_Tp*>(0), 0);
         101                 :     }
         102                 :
         103                 :   /**
         104                 :    *  @brief The companion to get_temporary_buffer().
         105                 :    *  @param  p  A buffer previously allocated by get_temporary_buffer.
         106                 :    *  @return   None.
         107                 :    *
         108                 :    *  Frees the memory pointed to by p.
         109                 :    */
         110                 :   template<typename _Tp>
         111                 :     inline void
         112               0 :     return_temporary_buffer(_Tp* __p)
         113               0 :     { ::operator delete(__p, std::nothrow); }
         114                 :
         115                 :
         116                 :   /**
         117                 :    *  This class is used in two places: stl_algo.h and ext/memory,
         118                 :    *  where it is wrapped as the temporary_buffer class.  See
         119                 :    *  temporary_buffer docs for more notes.
         120                 :    */
         121                 :   template<typename _ForwardIterator, typename _Tp>
         122                 :     class _Temporary_buffer
         123                 :     {
         124                 :       // concept requirements
         125                 :       __glibcxx_class_requires(_ForwardIterator, _ForwardIteratorConcept)
         126                 :
         127                 :     public:
         128                 :       typedef _Tp         value_type;
         129                 :       typedef value_type* pointer;
         130                 :       typedef pointer     iterator;
         131                 :       typedef ptrdiff_t   size_type;
         132                 :
         133                 :     protected:
         134                 :       size_type  _M_original_len;
         135                 :       size_type  _M_len;
         136                 :       pointer    _M_buffer;
         137                 :
         138                 :     public:
         139                 :       /// As per Table mumble.
         140                 :       size_type
         141               0 :       size() const
         142               0 :       { return _M_len; }
         143                 :
         144                 :       /// Returns the size requested by the constructor; may be >size().
         145                 :       size_type
         146                 :       requested_size() const
         147                 :       { return _M_original_len; }
         148                 :
         149                 :       /// As per Table mumble.
         150                 :       iterator
         151               0 :       begin()
         152               0 :       { return _M_buffer; }
         153                 :
         154                 :       /// As per Table mumble.
         155                 :       iterator
         156                 :       end()
         157                 :       { return _M_buffer + _M_len; }
         158                 :
         159                 :       /**
         160                 :        * Constructs a temporary buffer of a size somewhere between
         161                 :        * zero and the size of the given range.
         162                 :        */
         163                 :       _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last);
         164                 :
         165               0 :       ~_Temporary_buffer()
         166                 :       {
         167               0 :         std::_Destroy(_M_buffer, _M_buffer + _M_len);
         168               0 :         std::return_temporary_buffer(_M_buffer);
         169               0 :       }
         170                 :
         171                 :     private:
         172                 :       // Disable copy constructor and assignment operator.
         173                 :       _Temporary_buffer(const _Temporary_buffer&);
         174                 :
         175                 :       void
         176                 :       operator=(const _Temporary_buffer&);
         177                 :     };
         178                 :
         179                 :   template<typename _ForwardIterator, typename _Tp>
         180               0 :     _Temporary_buffer<_ForwardIterator, _Tp>::
         181                 :     _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
         182                 :     : _M_original_len(std::distance(__first, __last)),
         183               0 :       _M_len(0), _M_buffer(0)
         184                 :     {
         185                 :       __try
         186                 :         {
         187                 :           std::pair<pointer, size_type> __p(std::get_temporary_buffer<
         188               0 :                                             value_type>(_M_original_len));
         189               0 :           _M_buffer = __p.first;
         190               0 :           _M_len = __p.second;
         191               0 :           if(_M_buffer)
         192               0 :             std::__uninitialized_construct_range(_M_buffer, _M_buffer + _M_len,
         193                 :                                                  *__first);
         194                 :         }
         195                 :       __catch(...)
         196                 :         {
         197                 :           std::return_temporary_buffer(_M_buffer);
         198                 :           _M_buffer = 0;
         199                 :           _M_len = 0;
         200                 :           __throw_exception_again;
         201                 :         }
         202               0 :     }
         203                 :
         204                 : _GLIBCXX_END_NAMESPACE
         205                 :
         206                 : #endif /* _STL_TEMPBUF_H */
         207                 :

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