[ros-users] Ros Communications

[Daniel Stonier]

On 7 December 2010 09:23, Troy Straszheim <straszheim at willowgarage.com>wrote:

> On Mon, Dec 6, 2010 at 4:05 PM, Piotr Trojanek <piotr.trojanek at gmail.com>
> wrote:
> > Yes, I have tested the archive with std::vector and it simply works.
> >
> > I guess it works also for any collection, which is supported by
> > Boost::serialization framework.
> > The magic is in the <boost/serialization/vector.hpp> header, not in the
> > archive itself.
> >
> > For any primitive type always the same xdr_* function is called, so (by
> the
> > design of XDR)
> > it does not matter if the caller is 32 or 64 bit (nor if little/big
> endian).
> >
>
> Interesting.  collection_size_type is std::size_t:
>
>  BOOST_STRONG_TYPEDEF(std::size_t, collection_size_type)
>
> and in some implementations std::size_t is 'unsigned long'.  If you
> then use this implementation on two platforms where
> 'unsigned long' have different sizes, you will get incompatible
> archives.   In my experience with portable binary archives (we are
> going way back to boost 1.32), it was necessary to choose a size (e.g.
> handle collection_size_type explicitly and cast to uint64_t, for
> example).
>
> Cool archive, in any event.  boost::serialization is incredibly useful
> stuff.
>
> -t
> _______________________________________________
> ros-users mailing list
> ros-users at code.ros.org
> https://code.ros.org/mailman/listinfo/ros-users
>

Was talking to a group today who've also used boost::serialization under the
hood. Was wondering though - we did a test with binary archives of a large
ekf matrix a while ago (file dump on arm -> load on intel) and failed. Found
out later this was obscurely documented:
http://beta.boost.org/doc/libs/1_45_0/libs/serialization/doc/archives.html#archive_models(in
the code snippet comment '// non-portable binary archive').

Does this effect boost based messaging systems?

Cheers,
Daniel.

-- 
Phone : +82-10-5400-3296 (010-5400-3296)
Home: http://snorriheim.dnsdojo.com/
Yujin Robot: http://www.yujinrobot.com/
Embedded Ros : http://www.ros.org/wiki/eros
Embedded Control Libraries: http://snorriheim.dnsdojo.com/redmine/wiki/ecl
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ros.org/pipermail/ros-users/attachments/20101207/0a612e35/attachment-0003.html>