Architecture

• Relationships are unavoidable with objects in a space

  • The address of an object is the relationship between the object and the space within which it resides

• For any relationship there is a predicate form

  • Dick and Jane are married (relationship)
  • Are Dick and Jane married? (predicate)

• We normally think of objects as representing things or nouns

  • An object may also represent a relationship
  • The next pointer in a linked list represents the relationship between one element and its successor

• An object which represents a relationship is a witness to the relationship
• When copying a witness there are three possible outcomes
  • The relationship is maintained
  • The relationship is severed
  • The witness is invalidated

• Other mutating operations on any object in the relationship have the same possible outcomes

Give two example - the wedding band example An offset into an array example