calling non-static methods statically

[Hobson]

in this way ClassC::somefunc() should be declared as static. In 'unrelated' way it is possible to do like:

class Base
{
 public:
 int func();
}

class Derived: public Base
{
 public:
 int func();
}

class Unrelated
{
 int somefunc()
 {
  Derived obj;
  return obj.(Base::func());
 }
}

As you see, it is NOT static, because function has to be called for some object ('obj' in this example). In your first example the object for which the function was called is pointed by 'this', and its possible because derrived class contains object of its base class. In your second example, ClassC::somefunc() is not called for any object, even for 'this', since 'this' cannot point to object of unrelated class ClassC.

Quite complicated