dual

Article
01/03/2018

The latest version of this topic can be found at dual.

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

Syntax

  
[dual]

Remarks

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

Example

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")];

Requirements

Attribute Context

Applies to	`interface`
Repeatable	No
Required attributes	None
Invalid attributes	dispinterface

For more information, see Attribute Contexts.

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