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class Base {
public:
virtual void fnc(int param = 0);
};

class Derived: public Base {
public:
void fnc(int param = 1){}
};


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class Base {
public:
void fnc(int param = 0){
fncWork(param);
}

private:
virtual void fncWork(int param);
};

class Derived: public Base {
private:
virtual void fncWork(int param){}
};