uuid (C++ Attributes)

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01/03/2018

The latest version of this topic can be found at uuid (C++ Attributes).

Specifies the unique ID for a class or interface.

Syntax

  
      [ uuid(  
   "uuid"  
) ]

Parameters

uuid
A 128-bit, unique identifier.

Remarks

If the definition of an interface or class does not specify the uuid C++ attribute, then the Visual 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

Example

See the bindable example for a sample use of uuid.

Requirements

Attribute Context

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.

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