[prev in list] [next in list] [prev in thread] [next in thread] 

List:       boost-bugs
Subject:    Re: [Boost-bugs] [Boost C++ Libraries] #5139: Initial Stream
From:       "Boost C++ Libraries" <noreply () lists ! boost ! org>
Date:       2011-01-29 14:35:36
Message-ID: 066.62b6db948d355c95b7c55a3a75edbc9e () lists ! boost ! org
[Download RAW message or body]

#5139: Initial Stream Position in Boost.Interprocess.Vectorstream
---------------------------------+------------------------------------------
  Reporter:  charles@…           |       Owner:  igaztanaga  
      Type:  Bugs                |      Status:  new         
 Milestone:  To Be Determined    |   Component:  interprocess
   Version:  Boost 1.45.0        |    Severity:  Problem     
Resolution:                      |    Keywords:              
---------------------------------+------------------------------------------

Comment (by anonymous):

 I think the problem is with
 boost::interprocess::basic_vectorstream::seekoff.

 On line 284 of boost/interprocess/streams/vectorstream.hpp it reads:

 {{{
 #!div style="font-size: 80%"
 Code highlighting:
   {{{#!C++
       //Test for logic errors
       if(!in & !out)
          return pos_type(off_type(-1));
       else if((in && out) && (dir == std::ios_base::cur))
          return pos_type(off_type(-1));
       else if((in  && (!(m_mode & std::ios_base::in) || this->gptr() ==
 0)) ||
                (out && (!(m_mode & std::ios_base::out) || this->pptr() ==
 0)))
          return pos_type(off_type(-1));
   }}}
 }}}

 This code doesn't account for the possibility that the internal vector is
 empty, and the user simply wants to get the current position (which should
 be 0.)

 A possible fix would be:

 {{{
 #!div style="font-size: 80%"
 Code highlighting:
   {{{#!C++
 //Test for logic errors
 if (!in & !out)
    return pos_type(off_type(-1));
 else if((in && out) && (dir == std::ios_base::cur))
    return pos_type(off_type(-1));
 else if( (in && (!(m_mode & std::ios_base::in))) || (out && (!(m_mode &
 std::ios_base::out))))
    return pos_type(off_type(-1));
 else if ((in && this->gptr() == 0) || (out && this->pptr() == 0))
    return off == 0 ? pos_type(off_type(0)) : pos_type(off_type(-1));
   }}}
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5139#comment:1>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.
_______________________________________________
Boost-bugs mailing list
Boost-bugs@lists.boost.org
http://lists.boost.org/mailman/listinfo.cgi/boost-bugs

[prev in list] [next in list] [prev in thread] [next in thread]