[Boost-users] boost::python wrapping a container of boost::variant?

Hi. Does anyone have ideas how to convince boost::python to wrap a container of boost::variant? I need this to generate useful python bindings for a project of mine which uses boost::variant internally. Since python supports heterogenous containers natively, it seems to me this should be doable. However, I have attempted to find a solution on my own on several occasions, and always failed. One obvious hint is the indexing_suite. However, now that I looked at it again, I think I know where the problem is: The get_item method of indexing_suite always returns a data_type object, which is value_type from the container in question. However, from what I can see, I'd need something that converts to boost::python::object, so that I can return whatever class is appropriate for the actual variant instance. In other words, get_item would need to return a boost::python::object instead of data_type. To illustrate in code what I want, here is a minimal example: #include #include struct a { int x; }; struct b { double y; }; typedef boost::variant variant; typedef std::vector<variant> vector; BOOST_PYTHON_MODULE(bpv) { using namespace boost::python; class_<a>("a", init<a>()) .def(init<>()) .def_readonly("x", &a::x); class_<b>("b", init<b>()) .def(init<>()) .def_readonly("y", &b::y); } The question is, how do I expose std::vector<variant> to Python? I guess I need to define a static_visitor that returns python objects, something like: struct to_python_visitor : boost::static_visitor { result_type operator()(a const &a_) const { // return a boost::python::object that refers to a_ } ... }; And hook that up to the container support somehow such that boost::apply_visitor(to_python_visitor(), variant_instance) is called whenever a value is retrieved from the container. Can this even be done with current Boost.Python? Any hints, maybe even concrete code examples, would be highly appreciated. -- CYa, ⡍⠁⠗⠊⠕