Hi Ernie, > When I tries to use class exposed as ’wrapper’ as substitute for C > ++ original class i am getting a segfault error (see example below). > Is there is something wrong with a way i create a wrapper-class or > it is not intended to work as substitute for a base class?
I haven't tried your code sample but you'd normally just expose the wrapper class *instead* of the original class, with the name of "A". Python users don't need to know about the wrapper class intricacies. If you expose a non-pure-virtual method you should also add the default implementation, just as you cited from http://www.boost.org/doc/libs/1_57_0/libs/python/doc/tutorial/doc/html/python/exposing.html#python.class_virtual_functions (necessary to avoid infinite recursion if your Python override implementation calls the C++ base class method) I.e. something like (untested! Stick closely to the tutorial if in doubt) #include <iostream> #include <boost/python.hpp> class A { public: virtual ~A() { std::cout << "A destructor for object: " << this << std::endl; } virtual void info() { std::cout << "C++ A info for object" << this << std::endl; } }; struct A_Wrapper : A, boost::python::wrapper<A> { void info( { if (override info_override = this->get_override("info")) { return info_override(); } return A::info(); } void default_info() { return this->A::info(); } }; BOOST_PYTHON_MODULE(subclass) { boost::python::class_<A_Wrapper, boost::noncopyable>("A", boost::python::init <>() ) .def("info", &A::info, &A_Wrapper::default_info) ; } So the wrapper class provides you with the callback-ability to Python and this is the one to expose. As per the segfault you get: I guess that this might stem from your not calling the boost::python::wrapper<A> base class constructor in your A_Wapper constructor (note how I didn't provide a constructor for the wrapper class): A_Wrapper() : A() {} // <-- not calling all base constructors here Again, haven't actually tried it. Holger Landesbank Baden-Wuerttemberg Anstalt des oeffentlichen Rechts Hauptsitze: Stuttgart, Karlsruhe, Mannheim, Mainz HRA 12704 Amtsgericht Stuttgart _______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org https://mail.python.org/mailman/listinfo/cplusplus-sig
