C++: Accessing Grandparent Method

Question

Why doesn't this work, and what would be a good alternative?

class Grandparent
{
    void DoSomething( int number );
};

class Parent : Grandparent
{
};

class Child : Parent
{
    void DoSomething()
    {
        Grandparent::DoSomething( 10 ); // Does not work.
        Parent::DoSomething( 10 ); // Does not work.
    }
};

Answer 1

class Grandparent
{
protected:
    void DoSomething( int number );
};

class Parent : protected Grandparent
{
};

class Child : Parent
{
    void DoSomething()
    {
        Grandparent::DoSomething( 10 ); //Now it works
        Parent::DoSomething( 10 ); // Now it works.
    }
};

At a minimum it needs to look like that. Things are private by default when working with classes, this includes from subclasses.

http://codepad.org/xRhc5ig4

There is a full example that compiles and runs.