Compiler Warning (level 4) C4481

nonstandard extension used: override specifier 'keyword'

A keyword was used that is not in the C++ standard, for example, one of the override specifiers that also works under /clr. For more information, see,

• /clr (Common Language Runtime Compilation)

• Override Specifiers

Example

The following sample generates C4481.

// C4481.cpp
// compile with: /W4 /c
class B {
   virtual void f(unsigned);
};

class C : B {
   void f(unsigned) override;   // C4481
   void f2(unsigned);
};