Compiler Warning (level 4) C4266

The latest version of this topic can be found at Compiler Warning (level 4) C4266.

function' : no override available for virtual member function from base 'type'; function is hidden

A derived class did not override all overloads of a virtual function.

This warning is off by default. See Compiler Warnings That Are Off by Default for more information.

The following sample generates C4266:

// C4266.cpp  
// compile with: /W4 /c  
#pragma warning (default : 4266)  
class Engine {  
public:  
   virtual void OnException(int&,int);  
   virtual void OnException(int&,int&,int);  
};  
  
class LocalBinding : private Engine {  
   virtual void OnException(int&,int);  
};   // C4266  

Possible resolution:

// C4266b.cpp  
// compile with: /W4 /c  
#pragma warning (default : 4266)  
class Engine {  
public:  
   virtual void OnException(int&,int);  
   virtual void OnException(int&,int&,int);  
};  
  
class LocalBinding : private Engine {  
   virtual void OnException(int&,int);  
   virtual void OnException(int&, int&, int);  
};