[gt-users] Attach user data to GtGenomeNodes

[Sascha Steinbiss]

Sascha Steinbiss wrote:
> Gordon Gremme wrote:
>> For the record: I talked to Sascha fact-to-face about this yesterday
>> and we agreed to use strings as keys.
>> It makes things a little bit more brittle on the C-side but it should
>> greatly simplify the usage in the bindings.
> I have a first version of the C implementation ready in my 
> 'nodeuserdata' branch. Have a look at it, I added tests for the 
> functionality too.

As for the bindings, after some consideration I am thinking about 
implementing this differently in the bindings. Assume the bindings wrap 
the C functions, which store a void pointer. Python 
objects/dicts/whatever then could not be used in from the C side anyway. 
Furthermore, when these items are later retrieved again from the 
scripting language side via the wrapped C get_user_data() function, I am 
afraid they cannot be 'cast' back to their original format, thus losing 
their structure. Wouldn't it be a better idea if this functionality was 
implemented rather directly on the scripting language side than wrapping 
the C functions?

Sascha

-- 
Sascha Steinbiss
Center for Bioinformatics
University of Hamburg
Bundesstr. 43
20146 Hamburg
Germany

Email:  steinbiss at zbh.uni-hamburg.de
URL:    http://www.zbh.uni-hamburg.de/steinbiss
Phone:  +49 (40) 42838 7322
FAX:    +49 (40) 42838 7312