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Return a *safe* weak reference to a callable target

target -- the object to be weakly referenced, if it's a
    bound method reference, will create a BoundMethodWeakref,
    otherwise creates a simple weakref.
onDelete -- if provided, will have a hard reference stored
    to the callable to be called after the safe reference
    goes out of scope with the reference object, (either a
    weakref or a BoundMethodWeakref) as argument.

        def safeRef(target, onDelete = None):
    """Return a *safe* weak reference to a callable target

    target -- the object to be weakly referenced, if it's a
        bound method reference, will create a BoundMethodWeakref,
        otherwise creates a simple weakref.
    onDelete -- if provided, will have a hard reference stored
        to the callable to be called after the safe reference
        goes out of scope with the reference object, (either a
        weakref or a BoundMethodWeakref) as argument.
    """
    if hasattr(target, 'im_self'):
        if target.im_self is not None:
            # Turn a bound method into a BoundMethodWeakref instance.
            # Keep track of these instances for lookup by disconnect().
            assert hasattr(target, 'im_func'), """safeRef target %r has im_self, but no im_func, don't know how to create reference"""%( target,)
            reference = get_bound_method_weakref(
                target=target,
                onDelete=onDelete
            )
            return reference
    if callable(onDelete):
        return weakref.ref(target, onDelete)
    else:
        return weakref.ref( target )
        


src/b/o/bo-0.1-alpha/bo/dispatch/dispatcher.py   bo(Download)
 
        if weak:
            receiver = saferef.safeRef(receiver,
                                       onDelete=self._remove_receiver)
        with self.lock: