implements_category
Specifies the component categories implemented by the target class.
Syntax
[ implements_category(implements_category="uuid") ]
Parameters
implements_category
The ID of the implemented category.
Remarks
The implements_category C++ attribute specifies the component categories implemented by the target class. This is done by creating a CATEGORY map and adding separate entries specified by the implements_category attribute. For more information, see Component Categories and How They Work.
This attribute requires that the coclass, progid, or vi_progid attribute (or another attribute that implies one of these) also be applied to the same element. If any single attribute is used, the other two are automatically applied. For example, if progid is applied, vi_progid and coclass are also applied.
Example
The following code specifies that the following object implements the Control category.
// cpp_attr_ref_implements_category.cpp
// compile with: /LD
#define _ATL_ATTRIBUTES
#include "atlbase.h"
#include "atlcom.h"
[module (name="MyLib")];
[ coclass, implements_category("CATID_Control"),
uuid("20a0d0cc-5172-40f5-99ae-5e032f3205ae")]
class CMyClass {};
Requirements
| Attribute context | Value |
|---|---|
| Applies to | class, struct |
| Repeatable | Yes |
| Required attributes | One of the following: coclass, progid, or vi_progid |
| Invalid attributes | None |
For more information, see Attribute Contexts.