[Python-checkins] python/dist/src/Misc NEWS,1.1019,1.1020
fdrake at users.sourceforge.net
fdrake at users.sourceforge.net
Fri Jul 2 14:57:46 EDT 2004
Update of /cvsroot/python/python/dist/src/Misc
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv8493/Misc
Modified Files:
NEWS
Log Message:
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.
Index: NEWS
===================================================================
RCS file: /cvsroot/python/python/dist/src/Misc/NEWS,v
retrieving revision 1.1019
retrieving revision 1.1020
diff -C2 -d -r1.1019 -r1.1020
*** NEWS 2 Jul 2004 08:56:20 -0000 1.1019
--- NEWS 2 Jul 2004 18:57:42 -0000 1.1020
***************
*** 13,16 ****
--- 13,21 ----
-----------------
+ - weakref.ref is now the type object also known as
+ weakref.ReferenceType; it can be subclassed like any other new-style
+ class. There's less per-entry overhead in WeakValueDictionary
+ objects now (one object instead of three).
+
- Bug #951851: Python crashed when reading import table of certain
Windows DLLs.
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