10.5.11 UnionDef

A UnionDef represents an OMG IDL union definition.

module CORBA { struct UnionMember {


	Identifier	name;
	any	label;
	TypeCode	type;
	IDLType	type_def;
};

typedef sequence <UnionMember> UnionMemberSeq;

interface UnionDef : TypedefDef, Container {

readonly attribute TypeCode discriminator_type;

attribute IDLType discriminator_type_def;

attribute UnionMemberSeq members; }; };

10.5.11.1 Read Interface

The discriminator_type and discriminator_type_def attributes describe and identify the union’s discriminator type.

The members attribute contains a description of each union member. The label of each UnionMemberDescription is a distinct value of the discriminator_type. Adjacent members can have the same name. Members with the same name must also have the same type. A label with type octet and value 0 indicates the default union member.

The inherited type attribute is a tk_union TypeCode describing the union.

10.5.11.2 Write Interface

Setting the discriminator_type_def attribute also updates the discriminator_type attribute and setting the discriminator_type_def or members attribute also updates the type attribute.

When setting the members attribute, the type member of the UnionMember structure should be set to TC_void.

A UnionDef used as a Container may only contain StructDef, UnionDef, or EnumDef definitions.