Class Reffer

object --+
         |
        Reffer

Holds references to keep objects alive. Intended in combo with WeakEvent for bound method references e.g. self.onEvent, since self.onEvent creates a temporary instance that would otherwise be destroyed.

Usage:

>>> self.ref = Reffer()
>>> self.evt = WeakEvent()
>>> self.evt += self.ref(self.onEvt)
>>> ...
>>> self.evt -= self.ref(self.onEvt) # hashes the same each time