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event_source

Creates an event source.

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

Parameters

  • 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.

Remarks

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.

Note

A templated class or struct cannot contain events.

Requirements

Attribute Context

Applies to

class, struct

Repeatable

No

Required attributes

coclass when type=com

Invalid attributes

None

For more information, see Attribute Contexts.

See Also

Reference

event_receiver

__event

__hook

__unhook

Other Resources

Compiler Attributes

Class Attributes

ATL Samples