compiler-warning-level-1-c4490.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: Compiler Warning (level 1) C4490	Compiler Warning (level 1) C4490	11/04/2016	C4490	C4490	f9b03ecf-41a1-4f4d-a74c-2c1e88234ccc

Compiler Warning (level 1) C4490

'override' : incorrect use of override specifier; 'function' does not match a base ref class method

An override specifier was used incorrectly. For example, you do not override an interface function, you implement it.

For more information, see Override Specifiers.

Example

The following sample generates C4490.

// C4490.cpp
// compile with: /clr /c /W1

interface struct IFace {
   void Test();
};

ref struct Class1 : public IFace {
   virtual void Test() override {}   // C4490
   // try the following line instead
   // virtual void Test() {}
};