Creates an event source.

[ event_source(type, optimize=[speed | size], decorate=[true | false]) ]

type
An enumeration of one of the following values:

• native for unmanaged C/C++ code (default for unmanaged classes).

• com for COM code. You must use coclass when type=com. This value requires that you include the following header files:

  #define _ATL_ATTRIBUTES
  #include <atlbase.h>
  #include <atlcom.h>

optimize
When type is native, you can specify optimize=size, to indicate that there is 4 bytes of storage (minimum) for all events in a class or optimize=speed (the default) to indicate that there is 4 * (# of events) bytes of storage.

decorate
When type is native, you can specify decorate=false, to indicate that the expanded name in the merged (.mrg) file should not include the enclosing class name. /Fx lets you generate .mrg files. decorate=false, which is the default, results in fully-qualified type names in the merged file.

The event_source C++ attribute specifies that the class or structure to which it is applied will be an event source.

event_source is used in conjunction with the event_receiver attribute and the __event keyword. Use event_receiver to create event receivers. Use __event on methods within the event source to specify those methods as events.

For more information, see Attribute Contexts.

Compiler Attributes
event_receiver
__event
__hook
__unhook
Class Attributes