It seems very useful to me. By the way, is there a simple way to iterate through a fusion sequence or transformation of it with a python iterator?
Luca. 2009/2/27 Bruno Lalande <bruno.lala...@gmail.com> > Hello, > > The topic below was opened in the Boost development mailing list, > where it's been pointed out to me that it fits better here. > > You can also read the thread archive: > http://thread.gmane.org/gmane.comp.lib.boost.devel/186573 > > Regards > Bruno > > > ---------- Forwarded message ---------- > > > Hello, > > I have written a little function that converts any Boost.Fusion > sequence into a Python tuple (boost::python::tuple). If a sub-sequence > is nested in the sequence, the result will also be a nested tuple (for > instance, boost::make_tuple(0, std::make_pair(1, 2), 3) will give (0, > (1, 2), 3) in Python). > > The source code is attached to this mail. > > The principle is that any sequence previously adapted to Boost.Fusion > will become a tuple in Python. So, by including the right > boost/fusion/adapted/xxx header, one can convert a pair, a tuple, a > boost::array, and obviously any of the sequences provided by > Boost.Fusion. For example: > > #include <boost/python.hpp> > #include <boost/fusion/adapted/std_pair.hpp> > #include <boost/fusion/adapted/boost_tuple.hpp> > #include <boost/fusion/container/generation/make_vector.hpp> > #include "make_tuple_from_fusion_sequence.hpp" > > using namespace boost::python; > > tuple from_sequence() > { > return make_tuple_from_fusion( > boost::fusion::make_vector( > 1, > std::make_pair("first", "second"), > 2, > boost::make_tuple('a', 'b', 'c'), > 3 > ) > ); > } > > BOOST_PYTHON_MODULE(mymodule) > { > def("from_sequence", &from_sequence); > } > > > In Python we get: > > >>> import mymodule > >>> mymodule.from_sequence() > (1, ('first', 'second'), 2, ('a', 'b', 'c'), 3) > > > Is there any interest in adding this function into Boost.Python? If > yes, I can write the doc and tests, clean the source and maybe improve > the implementation (for example, I feel that I could avoid the use of > m_iteration with a better use of Boost.Fusion...). > > > Regards > Bruno > > _______________________________________________ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > http://mail.python.org/mailman/listinfo/cplusplus-sig > -- Ing. Luca Secchi Ass.to Turismo, Artigianato e Commercio Servizio amministrativo e legale, del bilancio e degli affari generali tel. interno 4312 tel. esterno 070/606 4312
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