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 | Value |
|---|---|
| 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.