[C++-sig] def_init required

[Achim Domma]

Hi,

see below a small test extension. If I don't call def_init on
class_<HelloWorld> I can load the extension and create an object, but if I
call 'showIt', I get the following error:

TypeError: bad argument type for built-in operation

Is def_init required for each class?

Achim

---- code -----

#include <boost/python/module.hpp>
#include <boost/python/class.hpp>
#include <iostream>

struct HelloWorld {
	HelloWorld(){};
	void showIt() {
		std::cout << "Hello World";
	}
};

BOOST_PYTHON_MODULE_INIT(HelloWorld)
{
    using namespace boost::python;
	module m("HelloWorld");

	m.add(
			class_<HelloWorld>("HelloWorld")
				.def_init()	// if missing -> type error
				.def("showIt",&HelloWorld::showIt)
		 );
}

---- code -----