7 Standard conversions [conv]

7.3 Function-to-pointer conversion [conv.func]

An lvalue of function type T can be converted to a prvalue of type “pointer to T”. The result is a pointer to the function.59

[Note: See [over.over] for additional rules for the case where the function is overloaded. end note]

This conversion never applies to non-static member functions because an lvalue that refers to a non-static member function cannot be obtained.