This PEP proposes adding an @override decorator to the Python type system. This will allow type checkers to prevent a class of bugs that occur when a base class changes methods that are inherited by derived classes.| Python Enhancement Proposals (PEPs)
PHP RFC: Marking overridden methods (#[\Override])| wiki.php.net
Table of contents| julien.jorge.st
The virtual specifier specifies that a non-static member function is virtual and supports dynamic dispatch. It may only appear in the decl-specifier-seq of the initial declaration of a non-static member function (i.e., when it is declared in the class definition).| en.cppreference.com