Multiple Inheritance: same variable name

Question

class A
{
   protected:
    string word;
};

class B
{
   protected:
    string word;
};

class Derived: public A, public B
{

};

How would the accessibility of the variable word be affected in Derived? How would I resolve it?

Answer 1

It will be ambiguous, and you'll get a compilation error saying that.

You'll need to use the right scope to use it:

 class Derived: public A, public B
{
    Derived()
    {
        A::word = "A!";
        B::word = "B!!";
    }
};

Answer 2

You can use the using keyword to tell the compiler which version to use:

class Derived : public A, public B
{
protected:
    using A::word;
};

This tells the compiler that the Derived class has a protected member word, which will be an alias to A::word. Then whenever you use the unqualified identifier word in the Derived class, it will mean A::word. If you want to use B::word you have to fully qualify the scope.