cxx11-explicit-overrides-and-final.h

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// https://en.wikipedia.org/wiki/C%2B%2B11#Explicit_overrides_and_final
 
// #1
struct Base {
    virtual void some_func(float);
};
 
struct Derived : Base {
    virtual void some_func(int) override; // ill-formed - doesn't override a base class method
};
 
// #2
struct Base1 final { };
 
struct Derived1 : Base1 { }; // ill-formed because the class Base1 has been marked final
 
// #3
struct Base2 {
    virtual bool c() const final override;  // from
    virtual bool d() const override final;  // https://bugs.kde.org/show_bug.cgi?id=397666
    virtual void f() final;
};
 
struct Derived2 : Base2 {
    void f(); // ill-formed because the virtual function Base2::f has been marked final
};