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Compiler Warning (level 1) C4374

Error Message

'function1': interface method will not be implemented by non-virtual method 'function2'

The compiler expected to find the virtual keyword on a method definition.

The following sample generates C4374:

// C4374.cpp
// compile with: /clr /W1 /c /WX
public interface class I {
   void f();

public ref struct B {
   void f() {

public ref struct C {
   virtual void f() {

public ref struct D : B, I {};   // C4374
public ref struct E : C, I {};   // OK