Feature #1149

Updated by J. Moringen over 11 years ago

For our migration to rsb we need some sort of functionality provided by
the @rsb::Listener@ rsb::Listener which allows us to check if there are any handlers
registered. In earlier version we used the @std::set<HandlerPtr>@ std::set&lt;HandlerPtr&gt; in
@rsb::Listener::Impl@ rsb::Listener::Impl which has been removed recently. So we would like
to have at least some kind of @bool hasHandlers()@ _bool hasHandlers()_ available.

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