Why can't a static member function have a cv-qualifier?

answer :

Firstly, 'cv' means const and volatile(opposite to const) 

When you apply the const qualifier to a non-static member function, it affects the this pointer. [ Note: A static member function does not have a this pointer (9.3.2). —end note ]For a const-qualified member function of class C, the this pointer is of type C const*, whereas for a member function that is not const-qualified, the this pointer is of type C*.

A static member function shall not be virtual. There shall not be a static and a non-static member function with the same name and the same parameter types.

A static member function shall not be declared const, volatile, or const volatile.