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v1_enum attribute

The [v1_enum] attribute directs that the specified enumerated type be transmitted as a 32-bit entity, rather than the 16-bit default.


[v1_enum] enum 
{
    ...
};

Parameters

This attribute has no parameters.

Remarks

Using the [v1_enum] attribute to transmit an enumerated type as a 32-bit entity increases the efficiency of marshaling and unmarshaling data when such an enumeration is embedded in structures or unions.

For improved performance, we recommend applying the [v1_enum] attribute to enumerators in 32-bit applications. Keep in mind, however, that on 16-bit platforms the C compiler treats an enumerated type as a 16-bit int. Therefore 16-bit client applications need to convert enum types to long for remote transmission in order to avoid overwriting data or sending incorrect values.

Examples

typedef [v1_enum] enum 
{
    value1, 
    value2, ...
};

See also

enum
Interface Definition (IDL) File
long

 

 

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