Re: [pygccxml-development] virtual functions without wrappers

[Matthias B. <ba...@ir...>]

Neal Becker wrote:
> I am playing with pyplusplus, trying out pypp_api.  I noticed that a class 
> with virtual functions and inheritance used wrappers, as shown in the 
> boost::python tutorial.
> 
> I would like to have to option to bypass these wrappers.  IIUC, wrappers are 
> only needed if the function will be overidden in python and then called from 
> c++.  My intention is a class hierarchy implemented in c++ only that is 
> called from python.
> 
> Here is a typical example:
> 
> struct base { virtual void F() = 0; };
> 
> struct impl_1 : base { virtual void F() { do something; } };
> 
> struct X {
> 	X (boost::shared_ptr<base> _p) : p (_p) {}
> 	boost::shared_ptr<base> p;
> 	void use_F () { (*p)->F(); }
> };
> 
> In python then:
> 
> i = impl_1()
> x = X (i)
> x.use_F()

I think what you're looking for is the "finalize" functionality which 
would tell Py++ that wrappers are not required. I'm not entirely sure, 
but I believe this functionality is currently not properly supported by 
Py++ (Roman has to give a definite answer here).

If you don't have to call F() from Python then a simple workaround would 
be to ignore that method (but again, I'm not sure if this will prevent 
Py++ from generating the wrapper class).

- Matthias -