AleksG0

class TButton {
public:
    virtual void onClick(void)=0;
};

class TButton1 : public TButton {
public:
    void onClick(void);
};

void TButton1::onClick(void){
    cout<<"click to button1";
}

int main()
{
    TButton *btn = new TButton1(); 
    btn->onClick();
    return 0;
}