Answer the address the receiver is pointing to. The address can
be absolute if the storage is nil, or relative to the Smalltalk
object in #storage. In this case, an address of 0 corresponds to
the first instance variable.
address: anInteger
Set the receiver to point to the passed address, anInteger
isAbsolute
Answer whether the object points into a garbage-collected Smalltalk
storage, or it is an absolute address.
printOn: aStream
Print a representation of the receiver
storage
Answer the storage that the receiver is pointing into, or nil
if the address is absolute.
storage: anObject
Change the receiver to point to the storage of anObject.