Using complex data type / class instance with juce::Value / juce::Var

[AdamVenn]

If all you want is something to send change messages, you could use
https://docs.juce.com/develop/classChangeBroadcaster.html

Or, if there is async stuff going on…

A ChangeBroadcaster / ChangeListener version with WeakReferences

Hi everybody,   after chasing down the 1000th dangling pointer access of a ChangeBroadcaster (which is incredibly painful, since there is no stack trace for asynchronous callbacks), I gave up and wrote a small class that uses a list of WeakReferences. I know if you deregister the ChangeListener in its destructor, everything is fine, but if you forget it one time, hell breaks loose and you spent hours trying to find the culprit. So here is the class: class SafeChangeBroadcaster; /** A class…

Or, if that looks a little heavy, you could implement Listener functionality yourself:
https://docs.juce.com/develop/classListenerList.html

Or, the simplest case, if you just have one callback you want to fire when there is a change, you can add a std::function member to your class which other classes can populate with a lambda/function. Your class then calls the function when it’s updating. I think there is a class for this kind of business too, but it might be easier to just check for null yourself:
https://docs.juce.com/develop/structNullCheckedInvocation.html#details