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ms_union

Visual Studio 2005

Controls the network data representation alignment of nonencapsulated unions.


[ms_union]

Remarks

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

Example

The following code shows the placement of ms_union:

// cpp_attr_ref_ms_union.cpp
// compile with: /LD
#include <unknwn.h>
[object, ms_union, uuid("00000000-0000-0000-0000-000000000001")]
__interface IFireTabCtrl {
   HRESULT DisplayString([in, string] char * p1);
};

[export, switch_type(short)] union _WILLIE_UNION_TYPE  {
   [case(24)]
      float fMays;
   [case(25)]
      double dMcCovey;
   [default]
      int x;
 };

[public] typedef _WILLIE_UNION_TYPE WILLIE_UNION_TYPE;

[module(name="ATLFIRELib")];

Requirements

Attribute Context

Applies to	Nonencapsulated unions
Repeatable	No
Required attributes	None
Invalid attributes	dispinterface

For more information, see Attribute Contexts.

Other Resources

IDL Attributes
Typedef, Enum, Union, and Struct Attributes
ATL Samples

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