Re: [pygccxml-development] serialization support?

[Roman Y. <rom...@gm...>]

On 9/13/06, Neal Becker <ndb...@gm...> wrote:
> The technique I have used is not really elegant, but works.  First serialize
> with boost::serializatoin into a string, then pickle the string:
>
> struct mt_pickle_suite : python::pickle_suite {
>
>   static python::object getstate (const rng_t& rng) {
>     std::ostringstream os;
>     boost::archive::binary_oarchive oa(os);
>     oa << rng;
>     return python::str (os.str());
>   }
>
>   static void
>   setstate(rng_t& rng, python::object entries) {
>     python::str s = python::extract<python::str> (entries)();
>     std::string st = python::extract<std::string> (s)();
>     std::istringstream is (st);
>
>     boost::archive::binary_iarchive ia (is);
>     ia >> rng;
>   }
> };
>
> [...]
> class_<rng_t> ("rng", "Mersenne Twister", python::init<rng_t::result_type>(
>                                                                              (python::arg ("seed")=4357),
>                                                                              "__init__(seed=4357)\n"
>                                                                              "Construct with optional seed\n"
>                                                                              "@param seed: initial seed\n"
>                                                                              ))
>     .def_pickle(mt_pickle_suite())
>     .def ("getstate", &mt_pickle_suite::getstate)
>     .def ("setstate", &mt_pickle_suite::setstate)
> [...]
>

Few comments:

1. This implementation will surprize any Python user. You don't
preserve references
    between objects.

2. I think you can make this code to be template on Pickled class.

3. I think this code belongs to goodies. Do you want to work a little
bit on it and contribute?
   ( test, few lines of documentation)

   from goodies import pickle
   pickle( module builder, list of classes )

   Something like this.

-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/