Item 16. Pointers to Member Functions Are Not Pointers
When you take the address of a non-static member function, you don’t get an address; you get a pointer to member function.
The declaration syntax of a pointer to member function is really no more difficult than that of a pointer to a regular function (which, admittedly, is bad enough as it is; see Dealing with Function and Array Declarators [17, 61]). As with pointers to data members, all that’s necessary is to use classname::* rather than * to indicate that the function referred to is a member of classname. Unlike a regular pointer to function, though, a pointer to member function can refer ...
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