Set-relations

Unlike list-relations, objects owned or used by other objects in set-relations are not listed in sequential order, but are grouped in a non-ordered set. They are directly accessible by a key. A set-relation cannot contain two objects associated with the same key.

Server supplies two class templates to define set-relations:

• <OwnerType,OwnedType,KeyType,KeyManager>;

• <UserType,UsedType,KeyType,KeyManager>.

These class templates both take the following four arguments:

• The owner or user type. This class must derive directly or transitively from IlsObject or IlsEntity. Derivation must be public.

• The owned or used type. This class must derive directly or transitively from IlsObject for IlsOwnsSet and from IlsObject or IlsEntity for IlsUsesSet. Derivation must be public.

• A class KeyType that specifies the key type used to store target objects.

• A class KeyManager that specifies how to handle keys—how to compare them, for example.