[ZODB-Dev] BTree sets and unhashable objects

[Roché Compaan]

* Casey Duncan <casey at zope.com> [2003-06-18 19:07]:
> AFAIK objects must compare consistently in order to work with sets. I don't 
> think they have to be hashable.

All the classes in our app have the same base class as ancestor so it
should be easy to implement a __cmp__ in that base and make it work.

I decided to rather use the paths of the objects in the set operations.
It turns out that this will give me a huge performance boost in the code
that prepares sequences for the set operations.

-- 
Roché Compaan
Upfront Systems                 http://www.upfrontsystems.co.za