[Pyrex] Weak references to Pyrex extension types

[Greg Ewing]

> From reading the Python Library Reference (section 3.3.3 "Weak
> References in Extension Types") it doesn't sound particularly
> difficult to support weak referencing. So is there any chance to get
> this into Pyrex in the near future?

It does look fairly straightforward. I'll add it to
the ToDo list.

> Is there any disadvantage in making *all* Pyrex extension types support 
> weak references?

Not much, by the looks of it, only 4 bytes per instance.
I'll probably do it that way to begin with, and not worry
until someone complains about the overhead. :-)

Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury,	   | A citizen of NewZealandCorp, a	  |
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