Re: [pygccxml-development] class hierachy with pure virtual .

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

On Wed, Aug 13, 2008 at 2:14 PM, Damien Fagnou
<dam...@mo...> wrote:
> Hi ,
>
> so here is my case :
>
> /// Module A
> /// __BIND__
> class Base
> {
>    /// __BIND__
>    void foo() = 0;
> }
>
> /// __BIND__
> class BaseImp : public Base
> {
>    void foo() { // do something default }
> }
>
> /// Module B
> /// __BIND__
> class Usefull : public BaseImp
> {
>    void foo() { // do something usefull }
> }
>
> I use doxygen to expose classes or methodes , ///__BIND__ is the trigger .
>
> Module A and B and build in too different process , and come for
> different libs .
> Module A is loaded before Module B.
>
> Class Base shouldnt/cant be overriden in python .

I can add new property to class "no_init", which will path "no_init"
to boost::python::class_<...> constructor. This will do the trick

>
> the problem that I am having is that when I call
>
> Usefull.foo() I get an exeption on calling a pure virtual function .
> and its kinda make sense when I look at the wrapper for Base::foo

Not for me.

Usefull is exposed too, right?
You also meant to wrote Usefull().foo(), right ?

In this case you should not get "pure virtual function call"
exception, because the function has "default" implementation.

I think something wrong with the example, you tried to build. May be
you have overloaded "foo"?

> can I tell py++ that I dont want a pureVirtual to be declare are such ?
> also can I force py++ to not enable virtual methods overwriting ?

No. The only "hacky" way you can do this, is to change function "virtuality"
http://language-binding.net/pyplusplus/documentation/apidocs/pygccxml.declarations.calldef.member_calldef_t-class.html#virtuality
but I am not responsible for the result :-)

> I guess that I could try to write the implemation of those class
> manually but py++ is doign such a good job that I have become very lasy :)

:-), Create complete example ( C++ + Python code with desired behavior
) and lets see what could be done


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