Do deep inheritance trees degrade efficiency?
tjreedy at udel.edu
Thu Mar 19 17:19:54 CET 2009
Terry Reedy wrote:
> Anthra Norell wrote:
>> Would anyone who knows the inner workings volunteer to clarify whether
>> or not every additional derivation of a class hierarchy adds an
>> indirection to the base class's method calls and attribute read-writes.
> More potential search layers rather than pointer indirection. But I
> doubt this is a bottleneck in very many programs. So I would more
> concern myself first with quickly writing correct code.
I should add that when object access time matters and the object is
accessed repeatedly, a common solution is to bind it to a local name
*once* and then access it via the local (which is the fastest way
possible for CPython and, I expect, for other implementation). This
works for all slower access methods.
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