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An accumulator that stops emission if any handler returns a zero value and sets
emission result to it in this case.  If all handlers return non-zero values,
signal emission is not stopped and result is returned by last handler.  If there
are no handlers at all, emission result is C{True}.

@note: Whether a value is non-zero is determined as by built-in C{bool} function.

src/p/y/py-notify-0.3.1/test/signal.py   py-notify(Download)
    def test_all_accept_accumulator (self):
        signal = Signal (AbstractSignal.ALL_ACCEPT)
        self.assertEqual (signal.emit (), True)
 
        signal.connect (lambda: True)