IUnknown Implementation

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.

ATL Class Overview

Related Articles   Fundamentals of ATL COM Objects

See Also   Aggregation and Class Factory Macros, COM Map Macros and Global Functions