On Aug 7, 11:28 pm, Stefan Bellon <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> I'm generating a binding from Python to C using SWIG. On the C side I
> have iterators over some data structures. On the Python side I
> currently use code like the following:
>
> def get_data(obj):
> result = []
> iter = make_iter(obj)
> while more(iter):
> item = next(iter)
> result.append(item)
> destroy(iter)
> return result
>
> Now I'd like to transform it to a generator function like the following
> in order to make it more memory and time efficient:
>
> def get_data(obj):
> iter = make_iter(obj)
> while more(iter):
> yield next(iter)
> destroy(iter)
>
> But in the generator case, I have a problem if the generator object is
> not iterated till the StopIteration occurs, but if iteration is stopped
> earlier. In that case, the C iterator's destroy is not called, thus the
> resource is not freed.
>
> Is there a way around this? Can I add some sort of __del__() to the
> generator object so that in case of an early destruction of the
> generator object, the external resource is freed as well?
>
> I'm looking forward to hearing your hints!
>
> --
> Stefan Bellon
Simple! :-)
def get_data(obj):
iter = make_iter(obj)
try:
while more(iter):
yield next(iter)
finally:
destroy(iter)
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