Manages object handles in Excel, and allows the objects to be serialized to a persistent cache.
class psl::PersistentHandleCache<T> : public HandleCache
The PersistentHandleCache<T> class is derived from HandleCache<T>, and adds the capbility to save the objects and their handles to persistent disk storage.
For a disussion of the use of PersistentHandleCache<T>, see Persistent object handles in the User Guide.
Only a single instance of a cache derived from HandleCache<T> is allowed to exist. So, if an instance of PersistentHandleCache<T> is instantiated, no further caches will be created at run-time.