[Boost-bugs] [Boost C++ Libraries] #5139: Initial Stream Position in Boost.Interprocess.Vectorstream

Subject: [Boost-bugs] [Boost C++ Libraries] #5139: Initial Stream Position in Boost.Interprocess.Vectorstream
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-01-29 13:04:46

#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     
 Keywords:                      |  
--------------------------------+-------------------------------------------
 When the boost::interprocess::basic_vectorstream<T> is default-
 constructed, tellp() initially returns an invalid stream position.
 Presumably, it should return position 0 before anything is inserted into
 the stream, but instead it returns -1.

 This is easy to reproduce:

 {{{
 #!div style="font-size: 100%"
 Code highlighting:
   {{{#!C++
 #include <sstream>
 #include <boost/interprocess/streams/vectorstream.hpp>

 int main()
 {
         std::stringstream ss;
         std::cout << ss.tellp() << " ";

         boost::interprocess::basic_vectorstream<std::vector<char> > vs;
         std::cout << vs.tellp() << std::endl;
 }
   }}}
 }}}

 This should output:
 0 -1

 In contrast with std::stringstream, we see that
 boost::interprocess::basic_vectorstream begins with an invalid stream
 position.  It should begin at 0, but it begins at -1.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5139>
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