Megapahit's fork of the Second Life viewer. https://megapahit.org/viewer.git/atom?h=26.4 2022-12-09T18:16:39Z 2022-12-09T18:16:39Z Nat Goodspeed nat@lindenlab.com 2022-12-09T18:16:39Z urn:sha1:00478b1e7671cb109771a1ad4fb40d47d15ab756 Deriving your tracked class T from LLInstanceTracker<T> gives you T::getInstance() et al. But what about a subclass S derived from T? S::getInstance() still delivers a pointer to T, requiring explicit downcast. And so on for other LLInstanceTracker methods. Instead, derive S from LLInstanceTrackerSubclass<S, T>. This implies that S is a grandchild class of T, but it also recasts the LLInstanceTracker methods to deliver results for S rather than for T.