entt

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I've been trying to experiment with not using signals, but found when not using sigh_mixin groups stop working. I'm not sure if this is a bug or intentional, but to reproduce take the example:

https://github.com/skypjack/entt/blob/master/test/example/signal_less.cpp

And add the line: auto grp = registry.group<int>();

Observe failure to compile due to group_handler implementation assuming on_construct exists.

Thanks

Indeed, they don't. Confirmed. They were designed on top of the signal mechanism initially and I never changed it. In theory, we can redesign them as a mixin today and avoid using signals. However, it's not super high prio at the moment.