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Showing content from https://en.cppreference.com/w/cpp/language/../identifier_with_special_meaning/override.html below:

C++ identifier with special meaning: override (since C++11)

• override specifier

struct b
{
    void f0() {};
    void f1() {};
    virtual void f2() {};
    virtual void f3() {};
    virtual void f4() {};
    virtual void f5() {};
};
 
struct d : b
{
    void f0() {};                        // OK. Neither: b::f0 nor d::f0 are virtual.
    void f1() override {};               // Error: cannot override non-virtual b::f1.
    void f2() override {};               // OK. Member function d::f2 is virtual.
    virtual void f3() {};                // OK. Specifier 'override'  is optional.
    virtual void f4() override {};       // OK. 'override' ensures b::f4 is virtual.
    virtual void f5() override final {}; // OK. d::f5 is both overriden and final.
};

• virtual, final

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