description	Learn more about: switch_is
title	switch_is (C++ COM Attribute)
ms.date	10/02/2018
f1_keywords	vc-attr.switch_is
helpviewer_keywords	switch_is attribute
ms.assetid	f1fffe5d-12d2-4e0f-8803-ccb715177d2d

switch_is

Specifies the expression or identifier acting as the union discriminant that selects the union member.

Syntax

[switch_is]

Remarks

The switch_is C++ attribute has the same functionality as the switch_is MIDL attribute.

Example

See the case example for a sample use of switch_is.

Requirements

Attribute context	Value
Applies to	typedef
Repeatable	No
Required attributes	None
Invalid attributes	None

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

See also

IDL Attributes
Typedef, Enum, Union, and Struct Attributes
switch_type