pygccxml-development

[pygccxml-development] Querying subclasses of some class?

[Paul M. <pa...@sc...>]

Hi,

I want to set a return policy for a whole set of class methods.
This set consists of all methods returning a pointer to some class A
*or one of its subclasses*.

I don't think I can directly accomplish this using
member_functions(return_value='A *'), as this doesn't seem to match the
subclasses. One way I can probably make this work is if I can iterate
over the subclasses of A and then do a member_functions() call
for the subclass pointer type, followed by setting the return policy.

Is there a way with pygccxml/Py++ to get a list of subclasses of
some class A?

Thanks,
Paul

Re: [pygccxml-development] Querying subclasses of some class?

[Roman Y. <rom...@gm...>]

On Mon, Oct 27, 2008 at 12:38 PM, Paul Melis <pa...@sc...> wrote:
> Hi,
>
> I want to set a return policy for a whole set of class methods.
> This set consists of all methods returning a pointer to some class A
> *or one of its subclasses*.
>
> I don't think I can directly accomplish this using
> member_functions(return_value='A *'), as this doesn't seem to match the
> subclasses. One way I can probably make this work is if I can iterate
> over the subclasses of A and then do a member_functions() call
> for the subclass pointer type, followed by setting the return policy.
>
> Is there a way with pygccxml/Py++ to get a list of subclasses of
> some class A?

Yes. pygccxml and Py++ provides the functionality you need:

* http://language-binding.net/pyplusplus/documentation/apidocs/pygccxml.declarations.type_traits-pysrc.html#is_base_and_derived
  take a look on is_based_and_derived.

  pygccxml implements\mimics almost all type traits found in
Boost.TypeTraits library

*  use class_t.recursive_derived property to get list of all classes,
which derives from "self" class.

HTH

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