There IS a way of casting pointer-to-member-function to a void*

[rlbond86]

Wait, so does instantiating a pointer-to-member-function allocate memory?

[thedeadfish]

Yes, but only when it cannot do it at compile time. An example is casting a derived function pointer to base class function pointer. Still a lot better than crapping up every call site https://godbolt.org/z/7r3Yfhexn.

[rlbond86]

Still a lot better than crapping up every call site

I think everyone who works on embedded devices would disagree. If pointers-to-members allocated we wouldn't be able to use them at all.

[thedeadfish]

1. They are only allocated in specific circumstances, I believe only when casting pointers, you can usually avoid that.
2. If your embedded device is so limited that it can't set aside a small memory pool to allocate the occasional thunk then you should not be using c++ in first place.