Multiple inheritance is probably interesting for GDS users. This is a relatively simple solution supplied with the toolkit.
https://azinterface.net/
So far, the toolkit is not as advanced as GDS but it covers most of the needs. Besides, it has a couple of small features that are absent in the current GDS versions.
I hope it will be useful and will gladly get feedback.
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www.azinterface.net - Interface-based multiple inheritance for LabVIEW OOP