[C++-sig] Exposing a C++ function that takes 2 out arguments to python

[Abhi]

How do I expose a C++ function that takes 2 out arguments with different 
memory ownership semantics to python. For instance,

consider A, B to be user-defined types

class C
{
    public:
    B* b_;

    void foo(A*& a, B*& b)
    {
        // create A on the heap and let caller take ownership
        A* a2 =  new A()
        a = a2;

        // create B, but we retain ownership
        b_ = new B();
        b = b_;
    }

    ~C()
    {
        delete b_;
    }

};

Notice that object "a" is to be destroyed in python, while "b" is owned by 
C++

How do I expose this in python?

I tried the following:

bp::tuple foo_Wrapper(C& self)
{
  A* a;
  B* b;
  self.foo(a, b)
  // Case1. In this case the "a" is never destroyed in python
  // -- "a" is leaked -- NOT what I want!
  // "b" is ok
  make_tuple(bp::ptr(a), bp::ptr(b) );

  // Case2: In this case they get copy constructed into the tuple
  // -- that means memory for "a" is leaked!
  // -- I don't really want a copy -- Changes the semantics, I want to
  // modify "a" & "b" in python && it is expensive to copy
  make_tuple(a, b);
}


Any other ideas?

thanks
-= Abhi