"override" Keyword

The override keyword can be placed after the arguments of a member function, e.g.

class Test
{
  public void func() override { }
};

It indicates that a class function overwrites a function of a base class. If this is not the case, the program is incorrect (syntax error).

A member function can therefore be used without specifier, with final, override, final override or override final.

A function marked as final/override must not be static.

If a function is marked as override, all overriding functions in the class must be marked so as well for consistency reasons. It is not a syntax error not to do this, but it will cause a warning during the integrity check.