Thanks Hugh, that helps a lot.  I was confused because it seemed to happen all
of a sudden without too many changes in VOS, and the problem affects almost all
of the Python classes.  One additional thing I noticed is that this doesn't
affect the *Ptr classes, e.g. Vobject class has the raise in __init__ but
VobjectPtr doesn't.  The problem seems to affect classes that do not have common
parent classes as well (e.g. it isn't just Vobject-derived classes), but Pete,
did you change some namespace notation or the virtuality of some stuff in
Vobject or VobjectBase?


On Fri, Sep 30, 2005 at 12:27:58AM +0200, Hugh Perkins wrote:
> Not all objects can be constructed, for example anything pure virtual
> Swig attempts to detect which objects can and cant be constructed. Sometimes
> it gets it wrong
> One way in which it gets wrong are where you instantiate a method in a
> derived class that was pure virtual in the base class. If the method
> parameters are not textually identical, Swig gets confused. For example if
> one has VOP::sometype, and the other has sometype, swig considers this as
> too differentypes. Since swig considers the derived class can no longer be
> constructed, you get the error below.
> Theres an option on the commandline to change behavior for creatoin of
> constructors, but you're probably better off diagnosing why the constructor
> is not being created.
> Note that this issue is a PAIN IN THE BUTT to diagnose. You might consider
> rebuilding swig from scratch and getting it to pump out rather more
> debugging information than it does. Otherwise look forward to a good half
> hour or more of instantiating all your methods (replacing = 0 with {} ) and
> stuff...
> Hugh
> On 9/28/05, Reed Hedges <[EMAIL PROTECTED]> wrote:
> >
> >
> > Hello, after about a week hiatus, I returned to a little bit of work I
> > was doing with Python. All of a sudden the SWIG wrapper won't work for
> > me and I don't know why. I may have done something to break it (I have
> > made a few changes to vos_swig.i etc.) but I can't figure out what. I
> > just updated VOS from CVS (excepting my local changes to SWIG of course).
> >
> > Every proxy class in Python that Swig generates now has the following in
> > its __init__ definition:
> >
> > def __init__(self): raise RuntimeError, "No constructor defined"
> >
> > WTF? This makes it impossible to create any Python objects!
> >
> > Help!
> >
> > Any ideas?
> >
> > Reed
> >
> >
> >
> > _______________________________________________
> > vos-d mailing list
> >
> >
> >

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