[C++-sig] to python conversion for derived facade

[Roman Yakovenko]

On Thu, Apr 10, 2008 at 7:12 PM, Moe Goldberg <goldberg at coredp.com> wrote:
> Hi,
>  I don't have a lot of experience with boost, expecially not with
>  to_python_converters, and I've been getting some unexpected results. I
>  have spent a while looking around to see what I can find, but I can't
>  seem to solve my problem, hopefully someone here can give me a hand.
>
>  Here's the situation. I have a facade class, and a class derived from
>  it. The facade class is exposed to python but the derived class isn't
>  (there are reasons for this, so exposing the derived class to python
>  isn't an option). The derived class wraps a type (let's call it cpp_type
>  - and it is also a type that I do not want exposed to python) that the
>  base class does not.
>  I several functions that return a cpp_type_sptr (a smart pointer to
>  cpp_type). I would like to create a to python converter so that I don't
>  have to manually wrap each function that returns a cpp_type_sptr.

I am not sure whether I understand what you are trying to do, but if
you want to return something different from the function you can
define custom call policy.

Take a look on custom call policies I defined
docs: http://language-binding.net/pyplusplus/documentation/functions/call_policies.html#py-defined-call-policies
source code: http://pygccxml.svn.sourceforge.net/viewvc/pygccxml/pyplusplus_dev/pyplusplus/code_repository/

This solution also allows you not to expose cpp_type_sptr class.

-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/