source (C++)

Article
01/03/2018

The latest version of this topic can be found at source (C++).

On a class, specifies the COM object's source interfaces for connection points. On a property or method, indicates that the member returns an object or VARIANT that is a source of events.

Syntax

  
      [ source(  
   interfaces  
) ]

Parameters

interfaces
One or more interfaces that you specify when you apply the source attribute to a class. This parameter is not used when source is applied to a property or method.

Remarks

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

You can use the default attribute to specify the default source interface for an object.

Example

// cpp_attr_ref_source.cpp  
// compile with: /LD  
#include "windows.h"  
#include "unknwn.h"  
[module(name="MyLib")];  
  
[object, uuid(11111111-1111-1111-1111-111111111111)]  
__interface b  
{  
   [id(0), propget, bindable, displaybind, defaultbind, requestedit]  
   HRESULT get_I([out, retval]long *i);  
};  
  
[object, uuid(11111111-1111-1111-1111-111111111131)]  
__interface c  
{  
   [id(0), propget, bindable, displaybind, defaultbind, requestedit]   
   HRESULT et_I([out, retval]long *i);  
};  
  
[coclass, default(c), uuid(11111111-1111-1111-1111-111111111132)]  
class N : public b  
{  
};  
  
[coclass, source(c), default(b, c), uuid(11111111-1111-1111-1111-111111111133)]  
class NN : public b  
{  
};

Requirements

Attribute Context

Applies to	class, `struct`, `interface`
Repeatable	No
Required attributes	coclass (when applied to class or struct)
Invalid attributes	None

For more information about the attribute contexts, see Attribute Contexts.

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