Introduced by: C++11

Overriding virtual functions is one of the most important mechanisms of C++ object oriented programming. The derived class method is overriding base class method when following requirements are met:

1.  the base class method has virtual keyword,
2. derived class method has:
   • the same name,
   • the same input parameters,
   • the same const-ness,
   • compatible return type.

If at least one of these requirement is not fulfilled, developer can end with not-overriding method and not even know about it. The C++11 standard introduces specifier override, designed for easy detection of such mistakes.

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