switch_type

switch_type(switch-type-specifier)

switch-type-specifier

Specifies an integer, character, boolean, or enum type, or an identifier of such a type.

Examples

typedef [switch_type(short)] union _WILLIE_UNION_TYPE { 

    [case(24)]

        float fMays;

    [case(25)]

        double dMcCovey;

    [default]

        ;

} WILLIE_UNION_TYPE;

typedef struct _WINNER_TYPE { 

    [switch_is(sUniformNumber)] union WILLIE_UNION_TYPE w;

    short sUniformNumber;

} WINNER_TYPE;

Remarks

The switch_type attribute identifies the type of the variable used as the union discriminant. The switch type can be an integer, character, boolean, or enum type.

The switch_is attribute specifies the name of the parameter that is the union discriminant. The switch_is attribute applies to parameters or members of structures or unions.

The union and its discriminant must be specified at the same logical level. When the union is a parameter, the union discriminant must be another parameter. When the union is a field of a structure, the discriminant must be another field of the structure at the same level as the union field.

See Also