uuid (C++ Attributes)

Specifies the unique ID for a class or interface.


[ uuid( "uuid" ) ]


A 128-bit, unique identifier.


If the definition of an interface or class does not specify the uuid C++ attribute, then the Microsoft C++ compiler will provide one. When you specify a uuid, you must include the quotes.

If you do not specify uuid, then the compiler will generate the same GUID for interfaces or classes with the same name in different attribute projects on a machine.

You can use Uuidgen.exe or Guidgen.exe to generate your own unique IDs. (To run either of these tools, click Start and click Run on the menu. Then enter the name of the required tool.)

When used in a project that does not also use ATL, specifying the uuid attribute is the same as specifying the uuid __declspec modifier. To retrieve the uuid of a class, you can use __uuidof


See the bindable example for a sample use of uuid.


Attribute context Value
Applies to class, struct, interface, union, enum
Repeatable No
Required attributes None
Invalid attributes None

For more information about the attribute contexts, see Attribute Contexts.

See also

IDL Attributes
Interface Attributes
Class Attributes
Typedef, Enum, Union, and Struct Attributes