dot asterisk operator in c++

Question

is there, and if, what it does?

.*

Answer 1

You may come across that operator when using member pointers:

struct foo
{
    void bar(void);
};

typedef void (foo::*func_ptr)(void);

func_ptr fptr = &foo::bar;
foo f;

(f.*fptr)(); // call

Also related is the ->* operator:

func_ptr fptr = &foo::bar;
foo f;
foo* fp = &f;

(fp->*fptr)(); // call