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#include <iostream>
 
template <class T>
class BASE
{
    protected:
 
        T DATA;
 
    public:
 
        BASE()
        {
            DATA = 10;
        }
        ~BASE(){}
 
};
template <class T>
class A : public virtual BASE<T>
{
    public:
 
        A(){}
        ~A(){}
 
};
template <class T>
class B : public virtual BASE<T>
{
    public:
 
        B(){}
        ~B(){}
 
};
template <class T>
class C: public A<T>, public B<T>
{
 
    public:
 
        C(){}
        ~C(){}
        T getDATA()
        {
                return DATA;
        }
};
int main()
{
    C<int> c;
    std::cout<<c.getDATA()<<std::endl;
 
    return 0;
}
 

prog.cpp: In member function ‘T C<T>::getDATA()’:
prog.cpp:47:24: error: ‘DATA’ was not declared in this scope
                 return DATA;
                        ^
prog.cpp: In member function ‘T C<T>::getDATA() [with T = int]’:
prog.cpp:48:9: warning: control reaches end of non-void function [-Wreturn-type]
         }
         ^

Standard output is empty