Re: [Boost-users] [Serialization] creating an archive fails under GCC-4.6.0

Subject: Re: [Boost-users] [Serialization] creating an archive fails under GCC-4.6.0
From: François Mauger (mauger_at_[hidden])
Date: 2011-04-18 00:22:42

Hi doug,

I don't kwow how to use a string (and a stringstream
as the target of serialization). I use plain std::vector<char>
as memory buffer, both for text/XML archives and binary archives.

Here are typical bits I use :
 >>>
  typedef std::vector<char> buffer_type;
  buffer_type buffer; // the target buffer for serialization
  {
    buffer.reserve (1000); // ensure some minimal capacity depending of 
the expected size of the archive
    // Archiving is redirected to the buffer:
    namespace io = boost::iostreams;
    io::stream<io::back_insert_device<buffer_type> > output_stream (buffer);
    boost::archive::text_oarchive oa (output_stream);
    oa << my_data;
    output_stream.flush ();
  }
<<<

In your case, as you use 

vector<string> _frames; 

as a collection of frames, I recommend this:

vector<buffer_type> _frames;
{
  buffer_type dummy; 
  _frames.push_back (dummy); // insert first a new `frame' in the collection
}
...
buffer_type & current_buffer = _frames.back (); // use the last inserted buffer from the collection
current_buffer.reserve (1000); 
...
io::stream<io::back_insert_device<buffer_type> > output_stream (current_buffer);
...

That would save a copy operation in your collection.

Hope it helps.

cheers
frc
--
doug livesey a écrit :
> Hi -- I have some code that runs when compiled with GCC-4.2 (on OSX 
> Snow Leopard), but that throws the following error with my fresh 
> compile of 4.6.0:
>    run_features(2872) malloc: *** error for object 0x100502060: 
> pointer being freed was not allocated
>    *** set a breakpoint in malloc_error_break to debug
>
> The line that creates this error is here, on line 
> 24: https://gist.github.com/923262
> (Apologies for any egregious code abuses in there, I'm just learning!)
> In the debugger, it lets me step from that line to the constructor of 
> xml_oarchive (line 114 of xml_oarchive.hpp), and when I try to step 
> any further, I get this:
>    run_features(2885) malloc: *** error for object 0x100501b00: 
> pointer being freed was not allocated
>    *** set a breakpoint in malloc_error_break to debug
>    
>    Program received signal SIGABRT, Aborted.
>    0x00007fff871a95d6 in __kill ()
>
> Could anyone advise me on what I could do to fix this? I really want 
> to be working with GCC 4.6.0 and the boost serialisation libraries.
> Incidentally, I reinstalled boost after I installed the latest GCC 
> (with homebrew), and I'd set cc, gcc, and g++ symlinks to GCC-4.6.0 
> before I did that, so boost should be compiled with the latest.
> Thanks very much for any & all assistance.
>    Doug.
> ------------------------------------------------------------------------
>
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-- 
François Mauger 
  Groupe "Interactions Fondamentales et Nature du Neutrino"
  NEMO-3/SuperNEMO Collaboration
LPC Caen-CNRS/IN2P3-UCBN-ENSICAEN
Département de Physique -- Université de Caen Basse-Normandie
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