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I've also written my own "version" of function but intentionally lightweight, for an embedded project: https://github.com/ambrop72/aprinter/blob/master/aprinter/ba...

Callback<void(int, int)> f = APRINTER_CB_OBJFUNC(&ThisClass::function, this);

One magic thing is that the macro is just a value, it figures out the type itself.

There's zero memory allocation. The Callback class just contains a function pointer and a void pointer. So you can't bind argument values other than the object pointer, but I have no need for that.

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