tree 60b870fedf9a942d17a1eed7c852fca73176d5ae
parent 4c398fde5c76847e12eb265716f35a57ce035822
author Guido van Rossum <guido@python.org> 1002554307 +0000
committer Guido van Rossum <guido@python.org> 1002554307 +0000
HG:extra convert_revision:svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/python/branches/legacy-trunk%4023579

Keep track of a type's subclasses (subtypes), in tp_subclasses, which
is a list of weak references to types (new-style classes).  Make this
accessible to Python as the function __subclasses__ which returns a
list of types -- we don't want Python programmers to be able to
manipulate the raw list.

In order to make this possible, I also had to add weak reference
support to type objects.

This will eventually be used together with a trap on attribute
assignment for dynamic classes for a major speed-up without losing the
dynamic properties of types: when a __foo__ method is added to a
class, the class and all its subclasses will get an appropriate tp_foo
slot function.