custom-cpp.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: custom (C++)	custom (C++)	11/04/2016	vc-attr.custom	custom attributes, defining	3abac928-4d55-4ea6-8cf6-8427a4ad79f1

custom (C++)

Defines metadata for an object in the type library.

Syntax

[ custom(
   uuid,
   value
) ];

Parameters

uuid
A unique ID.

value
A value that can be put into a variant.

Remarks

The custom C++ attribute will cause information to be placed into the type library. You will need a tool that reads the custom value from type library.

The custom attribute has the same functionality as the custom MIDL attribute.

Requirements

Attribute Context

• Applies to: Non-COM interface, idl_module methods, interface members, interface parameters, typedef, class, enum, union, and struct types.
• Repeatable: Yes.
• Required attributes: coclass (when used on class).
• Invalid attributes: None.

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

See also

IDL Attributes
Stand-Alone Attributes
Typedef, Enum, Union, and Struct Attributes
Parameter Attributes
Method Attributes
Class Attributes
Interface Attributes