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…tener was invoked They are same as dispatch and directDispatch but return true if there is any listener for the event (for HeterEventDispatcher, any listener with the prototype matching the arguments), false if there is no listener or the dispatching is blocked by a mixin. This avoids calling hasAnyListener before dispatch, which looks up the event twice and is not atomic in multi threading. dispatch and directDispatch keep returning void and now forward to the new functions, so existing code is not affected. Added HeterCallbackList::invokeIfAny for the heter dispatcher. Added unit tests and documents.
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They are same as dispatch and directDispatch but return true if there is any listener for the event (for HeterEventDispatcher, any listener with the prototype matching the arguments), false if there is no listener or the dispatching is blocked by a mixin. This avoids calling hasAnyListener before dispatch, which looks up the event twice and is not atomic in multi threading.
dispatch and directDispatch keep returning void and now forward to the new functions, so existing code is not affected. Added HeterCallbackList::invokeIfAny for the heter dispatcher. Added unit tests and documents.