boost.python overloading to_python

4 Sep 2002

      hi,
please consider the following example

class A {
public:
 A() {}
 A(const A& a) {}
};

class A2 : public A {
public:
 A2() : A() {}
 A2(const A2& a2) : A(a2) {}
};

class B {
public:
 const A& getA(); //returns refs to A or A2
};

now, when exposing this in boost, i would always get A's when 
calling B::getA() from python, which i understand, since AFAIK 
the copy Ctors are used to instantiate the python object.

to overcome this i wrote:

PyObject *to_python(const A &a) {
  if (dynamic_cast(&a)) {     
     return to_python::((const A2 &)a);//done by class_builder<A2>
  } else {
     //HOW DO I CALL THE IMPL DONE BY class_builder<A> ?
     return 0;
  }
}

which works fine, except that i dont know how to resort to the 
automatic implementation for 
PyObject *to_python(const A& a)
provided by the class builder for A.

any help is greatly appreciated.
greetings, daniel

dkottowk

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