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IUnknown Implementation Classes

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The latest version of this topic can be found at IUnknown Implementation Classes (ATL).

The following classes implement IUnknown and related methods:

  • CComObjectRootEx Manages reference counting for both aggregated and nonaggregated objects. Allows you to specify a threading model.

  • CComObjectRoot Manages reference counting for both aggregated and nonaggregated objects. Uses the default threading model of the server.

  • CComAggObject Implements IUnknown for an aggregated object.

  • CComObject Implements IUnknown for a nonaggregated object.

  • CComPolyObject Implements IUnknown for aggregated and nonaggregated objects. Using CComPolyObject avoids having both CComAggObject and CComObject in your module. A single CComPolyObject object handles both aggregated and nonaggregated cases.

  • CComObjectNoLock Implements IUnknown for a nonaggregated object, without modifying the module lock count.

  • CComTearOffObject Implements IUnknown for a tear-off interface.

  • CComCachedTearOffObject Implements IUnknown for a "cached" tear-off interface.

  • CComContainedObject Implements IUnknown for the inner object of an aggregation or a tear-off interface.

  • CComObjectGlobal Manages a reference count on the module to ensure your object won't be deleted.

  • CComObjectStack Creates a temporary COM object, using a skeletal implementation of IUnknown.

Fundamentals of ATL COM Objects

See Also

Class Overview
Aggregation and Class Factory Macros
COM Map Macros
COM Map Global Functions