Re: [pygccxml-development] Adding wrappers...

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

On 4/9/06, Matthias Baas <ba...@ir...> wrote:
> Hi,
>
> this mail is sort of a continuation of the thread "How to manage wrapper
> classes?"...

Good. I knew that you plan next revolution in py++. Now code_creators
are target.
Okay, lets do it :-)

> Meanwhile I have some code that can generate wrapper source code for
> individual member functions. The question now is how do I insert those
> into pyplusplus?
> What I would actually like to do is adding those generated functions to
> the appropriate *.cpp file that is generated by pyplusplus and then
> replace the original member function with this wrapper function.

It is possible to solve your problem using existing tools + adding
some new ones.
The general solution is next:

every class has associated class wrapper with it. file writers
guarantee that class
will see definition of it's class wrapper, otherwise it will not compile. O=
n
decl_wrappers.class_t we have add_code/add_wrapper_code functionality.
I propose to add similar functionality to decl_wrappers.calldef_t class:  t=
wo
properties: replace_code and replace_wrapper_code. module_creator.creator_t
class will check those properties and will create right code creators,
that instead of
generating default code will put user code as is.

I think, this is simple solution that is very easy to understand and implem=
ent.
( I estimate 2-3 days =3D=3D ( 6 - 8 hours including some testing )
User can use powerful query interface and don't need to be familiar with co=
de
creators.

What do you think?

> I had a
> look at the multi file writer (while doing so I also added some doc
> strings)
Many thanks!

> but it seems that adding code to a generated file is not possible.

You can always to derive from built-in file_writer and implement your own o=
ne.
This is was my original idea.

> Alternatively, I could stick my new code in a separate file (.h/.cpp).
> Then the only problem is to include the header in the pyplusplus file.
> As far as I can tell this also cannot be done on a file-by-file basis,
> but I could add the header files to *all* generated files at once (not
> really a nice solution but at least it could work).

No, the better solution is to add to code_creators.class_t list of
code_creators.include_t. Thus file writer will understand that user provide=
d an
additional header files and will put them in a right place.

> Are there any suggestions on how this could be improved? I think
> pyplusplus is in need of more flexibility in this area.

I agree :-). You can prepare "to do" list for next release.

> This all gets even more problematic if pyplusplus has already decided to
> generate wrappers and I want to add wrapper code as well. How can these
> two be combined? It might be that I have such examples as well in the
> Maya SDK, but I'm not really that far yet...

I prefer to solve main problematic scenario. After this we will see.

If we will release py++ this week, it is possible to implement all
your request next
week. We have some holidays ( passover ).

> - Matthias -

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