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authorFred Drake <fdrake@acm.org>2004-07-02 18:57:45 (GMT)
committerFred Drake <fdrake@acm.org>2004-07-02 18:57:45 (GMT)
commit0a4dd390bf653128de8bc2e99da64967c8cdf86e (patch)
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parent813914049de32303ce31cae11abe9c5a49a08a4e (diff)
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Make weak references subclassable:
- weakref.ref and weakref.ReferenceType will become aliases for each other - weakref.ref will be a modern, new-style class with proper __new__ and __init__ methods - weakref.WeakValueDictionary will have a lighter memory footprint, using a new weakref.ref subclass to associate the key with the value, allowing us to have only a single object of overhead for each dictionary entry (currently, there are 3 objects of overhead per entry: a weakref to the value, a weakref to the dictionary, and a function object used as a weakref callback; the weakref to the dictionary could be avoided without this change) - a new macro, PyWeakref_CheckRefExact(), will be added - PyWeakref_CheckRef() will check for subclasses of weakref.ref This closes SF patch #983019.
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