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title defaultvtable | Microsoft Docs
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ms.date 11/04/2016
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ms.topic language-reference
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vc-attr.defaultvtable
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C++
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defaultvtable attribute
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author mikeblome
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defaultvtable

Defines an interface as the default vtable interface for a COM object.

Syntax

  
      [ defaultvtable(  
   interface  
) ]

Parameters

interface
The designated interface that you want to have the default vtable for the COM object.

Remarks

The defaultvtable C++ attribute has the same functionality as the defaultvtable MIDL attribute.

Example

The following code shows attributes on a class that use defaultvtable to specify a default interface:

// cpp_attr_ref_defaultvtable.cpp  
// compile with: /LD  
#include <unknwn.h>  
[module(name="MyLib")];  
  
[object, uuid("00000000-0000-0000-0000-000000000001")]  
__interface IMyI1 {  
   HRESULT x();  
};  
  
[object, uuid("00000000-0000-0000-0000-000000000002")]  
__interface IMyI2 {  
   HRESULT x();  
};  
  
[object, uuid("00000000-0000-0000-0000-000000000003")]  
__interface IMyI3 {  
   HRESULT x();  
};  
  
[coclass, source(IMyI3, IMyI1), default(IMyI3, IMyI2), defaultvtable(IMyI1),  
uuid("00000000-0000-0000-0000-000000000004")]  
class CMyC3 : public IMyI3 {};

Requirements

Attribute Context
Applies to class, struct
Repeatable No
Required attributes coclass
Invalid attributes None

For more information, see Attribute Contexts.

See Also

IDL Attributes
Class Attributes