Re: [boost] py_cpp: bugs in the docs, feature requests...

From: Prabhu Ramachandran (prabhu_at_[hidden])
Date: 2000-10-31 12:30:26

hi,

>>>>> "David" == David Abrahams <abrahams_at_[hidden]> writes:

    >> This works fine.  I'd appreciate a change in the docs that
    >> reflect this.  It was a pain assuming that the docs were right
    >> and looking for other non-existent errors.

    David> I appreciate that. Thanks for tracking this bug down. I
    David> think this is an old usage that used to be supported but is
    David> not any longer and hasn't been tested recently. Consider it
    David> fixed.
Thanks. 

<snip>
    David> world_callback* is missing, causing the error.  I could do
    David> something to make the other usage work, but I'm not sure
    David> it's worth it. My feeling is that one way to do it is
    David> enough, (provided that it's correctly documented, of course
    David> ;-))

I agree.  One way is enough.  And this callback thing is really cool.
I cant begin to imagine the things you can do with liraries.  Derive
new classes under python and still allow the original c++ functions to
use these derived classes from within python. Wow!!

    >> (2) Given a class library, it is normal for a useful concrete
    >> class to have a large inheritance.  Currently, with py_cpp, if
<snip>
    >> painful.  Is there a way out of this?  Or is this impossible to
    >> implement?  Or am I missing something.

    David> You're missing the as-yet-undocumented construct
    David> "class_B.declare_base(class_A)" which was implemented by
    David> Ullrich Koethe. I am going to make a new release today that
    David> includes documentation for this feature.

Wow!  Cool.  Just checked it out.  It works fine for my simple test
case, but does it recurse right thru?  i.e. A<-B<-C<-D.  So will D be
able to call a method defined way back in A?  I guess so, just
checking.  Also, how about multiple inheritance??  Do you just say

class_B.declare_base (class_A, class_C);
or is it
class_B.declare_base (class_A);
class_B.declare_base (class_C);

Thanks! I am getting to enjoy my testing py_cpp. :)

prabhu