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        Callable closure method.
    :param GObject.SignalFlags flags:
        Flags specifying when to run closure.
    :param type return_type:
        Return type of the Signal.
    :param list arg_types:
        List of argument types specifying the signals function signature
    :param str doc:
        Documentation of signal object.
    :param callable accumulator:
        Accumulator method with the signature:
        func(ihint, return_accu, handler_return, accu_data) -> boolean
    :param object accu_data:
        User data passed to the accumulator.

    :Example:

    .. code-block:: python

        class Spam(GObject.Object):
            velocity = 0

            @GObject.Signal
            def pushed(self):
                self.velocity += 1

            @GObject.Signal(flags=GObject.SignalFlags.RUN_LAST)
            def pulled(self):
                self.velocity -= 1

            stomped = GObject.Signal('stomped', arg_types=(int,))

            @GObject.Signal
            def annotated_signal(self, a:int, b:str):
                "Python3 annotation support for parameter types.

        def on_pushed(obj):
            print(obj)

        spam = Spam()
        spam.pushed.connect(on_pushed)
        spam.pushed.emit()
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