godfat (owner)

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none.cpp #
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#include <iostream>
 
template <class T>
class None: public T{
public:
    static None<T>* none(){
        static None<T> _;
        return &_;
    }
private:
    None<T>(){}
};
 
class Base{
public:
    virtual Base* test(){
        static Base _;
        return &_;
    }
};
 
class Derived: public Base{
public:
    virtual None<Base>* test(){
        return None<Base>::none();
    }
};
 
int main(){
    using std::cout;
    using std::endl;
 
    Base base;
    Derived derived;
    Base* b;
 
    b = base.test();
    cout << "base:    " << b << endl;
 
    b = derived.test();
    cout << "derived: " << b << endl;
 
    cout << "none:    " << None<Base>::none() << endl;
}
 
/*
base:    0x2048
derived: 0x204c
none:    0x204c
*/