The Entry class (See Figure 3.21) is used for association of an EntryID with an entry point for the persistent storage. The class is invisible from the user, and implements the SortableObject interface (See Section 3.2.2).
The member variable entryID is an integer for identifying an PersistentPointer as an entry point of a data structure in the persistent storage.
The member variable entryPoint is the entry point associated with the entryID.
A table of the objects is maintained by the PersistentStorage object (See Section 3.3.2).
The operators and accessors are self-explanatory.
![\begin{figure}
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