## IUnknown Macro

To simplify the creation of new interfaces, the Combase.h header file includes a macro that declares the three methods of the IUnknown interface.

Function | Description
DECLARE_IUNKNOWN | Declares the three methods of the base interface for a new interface.

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DECLARE_IUNKNOWN

IUnknown Macro

Declares the three methods of the base interface for a new interface.

#define DECLARE_IUNKNOWN

##### Remarks

When you create a new interface, it must derive from IUnknown, which has three methods: QueryInterface, AddRef, and Release. This macro simplifies the declaration process by declaring each of these methods for the new interface.

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