dual

 

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Places an interface in the .idl file as a dual interface.

  
[dual]  
  

When the dual C++ attribute precedes an interface, it causes the interface to be placed inside the library block in the generated .idl file.

The following code is an attribute block that uses dual before an interface definition:

// cpp_attr_ref_dual.cpp  
// compile with: /LD  
#include <windows.h>  
[module(name="MyLibrary")];  
  
[uuid("2F5F63F1-16DA-11d2-9E7B-00C04FB926DA"), dual]  
  
__interface IStatic : IDispatch   
{  
   HRESULT Func1(int i);  
   [   propget,   
      id(1),   
      bindable,   
      displaybind,   
      defaultbind,   
      requestedit  
   ]   
   HRESULT P1([out, retval] long *nSize);  
   [   propput,   
      id(1),   
      bindable,   
      displaybind,   
      defaultbind,   
      requestedit  
   ]   
   HRESULT P1([in] long nSize);      
};  
  
[cpp_quote("#include file.h")];  

Attribute Context

Applies tointerface
RepeatableNo
Required attributesNone
Invalid attributesdispinterface

For more information, see Attribute Contexts.

IDL Attributes
Attributes by Usage
custom
dispinterface
object
__interface
Attributes Samples

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