struct Base
{ virtual void foo(); };

struct D1 : Base
{ virtual void foo(); };

struct D2 : D1
{ void foo(); };

D2 instance;
D1* d1ptr = &instance;
Base* baseptr = &instance;

//normal function call to "D2::foo()", no dynamic dispatch.
instance.foo();
//virtual function call to "D2::foo()", one dynamic dispatch.
d1ptr.foo();
//virtual function call to "D2::foo()", does this incur additional
//..overhead compared to "d1ptr.foo()"?
baseptr.foo();