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Typically Qt signals are triggered on a specific instance of a QObject.
Is there a way to trigger it on all instances of a specific class via, perhaps, MetaObjects?
Or the only way is to maintain your own static list of all instances, perhaps by using constructors and destructors, and then just Q_FOREACH it?
How about creating a singleton behind the scenes, and connecting all your instances to a signal from that singleton (signal-to-signal connection)?
When you want all your instances to emit the signal, just make the singleton emit it, and all instances will forward it.