Jacek Generowicz jacek.generowicz at cern.ch
Fri Nov 19 03:45:37 EST 2004

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I would like some of my _dynamically_ created new-style classes to
have instances which are not represented by the standard PyObject, but
one which has an extra void* slot which I want to use for my nefarious
purposes, in extension functions. The pointer need not be initialized
(for now) I just want it to be there in case I want to stuff something
in there later on in the run.

What is the laziest way of achieving this?

As far as I can tell, PyTypeObject (and its allocators, deallocators,
methods in general) only refer to the type of the instance struct via
tp_basicsize (where only the struct's size is held). 

So my first attempt merely resets tp_basicsize to the size of my
alternative instance struct, as soon as the class is created. This
goes horribly wrong when instances of the class are deallocated, but I
can't see why.

Where else must I provide information about the instance struct type ?


[I will be away for a few days, from a few hours from now; please
don't take a long response time as a sign of rudeness.]

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