At Fri, 10 Dec 2010 17:12:12 +1100, Allan Johns wrote:
Hi,
Is it possible to register to-python converters for polymorphic types held in shared_ptr? This does not seem to work for me.
I have a virtual base class Object, and derived classes TypedAttribute<T> (with method 'value()' that returns a simple type - float, int etc).
My boost.python registration code looks like so:
template<typename Attrib> struct typed_attrib_topython { static PyObject* convert(const Attrib& a) { return bp::incref(bp::object(a.value()).ptr()); } };
template<typename T> struct TypedAttribBind { typedef TypedAttribute<T> attrib_t;
TypedAttribBind() { boost::python::to_python_converter<attrib_t, typed_attrib_topython<attrib_t> >(); } };
However this doesn't work.
Doesn't work how? You shouldn't need to do anything special for shared_ptrs; just return them. Don't register converters. See shared_ptr.cpp in Boost.Python's libs/python/test/ directory. -- Dave Abrahams BoostPro Computing http://www.boostpro.com