description | title | ms.date | f1_keywords | helpviewer_keywords | ms.assetid | ||
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Learn more about: Compiler Warning (level 4) C4680 |
Compiler Warning (level 4) C4680 |
11/04/2016 |
|
|
6e043f4c-c601-4b77-8130-920cff1d912e |
'class' : coclass does not specify a default interface
A default interface was not specified for a class that was marked with the coclass attribute. In order for an object to be useful, it must implement an interface.
The following sample generates C4680:
// C4680.cpp
// compile with: /W4
#include <windows.h>
[module(name="MyModule")];
[ object, uuid(373a1a4c-469b-11d3-a6b0-00c04f79ae8f) ]
__interface IMyIface1
{
HRESULT f1();
};
[ object, uuid(37331a4c-469b-11d3-a6b0-00c04f79ae8f) ]
__interface IMyIface2
{
HRESULT f1();
};
// to resolve C4680, specify a source interface also
// for example, default(IMyIface1, IMyface2)
[ coclass, uuid(373a1a4d-469b-11d3-a6b0-00c04f79ae8f), default(IMyIface1), source(IMyIface1) ]
class CMyClass : public IMyIface1
{ // C4680
};
int main()
{
}