Re: [pygccxml-development] 2 Questions

[Allen B. <al...@vr...>]

Roman Yakovenko wrote:

> On 9/12/06, Allen Bierbaum <al...@vr...> wrote:
>
>> I have two questions that I am surprised I haven't run into before. I
>> hope that both have easy answers.
>>
>> 1. Base class virtual ignored, but coming in inside derived class 
>> wrappers.
>>
>> I have a base class and derived class like:
>>
>> struct Base
>> {
>>    virtual const int* getData() const = 0;
>> };
>>
>> struct Child : public Base
>> { }
>>
>> struct GrandChild : public Child
>> {
>>    virtual const int* getData() const;
>> }
>>
>> In my py++ generation script I ignore the getData decl in the Base class
>> (and the GrandChild).  But py++ still ends up generating wrapper code
>> for getData for the Child class.  To make matters worse, since it is not
>> a decl for getData in the Child class I can not ignore it there.  It is
>> almost like Py++ is seeing the virtual method and deciding that it needs
>> to provide a wrapper for it in Child even though it is ignored in Base.
>> Is this a bug in Py++ or is there some way that I can take care of this.
>
>
> Do you know how hard I work to implement this? Basically this is because
> wrapper classes could not be abstract. Also untill now I didn't have 
> use case
> where user ignore some method. May be I will have to take a look on it.

Can you give me a pointer to where the logic for this is so I can take a 
look at fixing it?

>
>>
>> 2. The alternative option would be to just wrap the method correctly,
>> but how can I wrap returning a memory buffer (array) of arbitrary 
>> length?
>>
>> Is there a way to wrap this method so it will return a const wrapper
>> around this data buffer to make it look like a python list?  If so what
>> is the easiest way to do it and do I really need to wait for MB's method
>> transformer code to do it right?
>
>
> You don't have to wait, you can join and help :-). Take a look on 
> TnFOX Python
> bindings, they deal with the same problem ( image classes ). It uses 
> indexing
> suite v2 to solve the problem.
>
This will probably be the long term solution for me.  Right now I just 
need to get my bindings compiling again so I can get some short term 
work done.

Thanks,
Allen