Get function pointer from std::function when using std::bind?

This is quite impossible. The whole reason that std::function exists is that function pointers suck horrifically and should never, ever, be used by anyone, ever again, except for the doomed souls bearing the Burning Standards of Hell C interoperation, because they cannot handle functions with state.

You can't get a function pointer out of an std::function, as there may not even be one. It could be a member function pointer instead, or an object that implements operator().

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