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.