4. Object Structures, Aliasing, and Encapsulation

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3. Arguments (arg mode):• Expressions with mode “arg” hold references toarguments of the object structure.• <strong>Object</strong>s must not be changed through argreferences.• Arg-objects can be passed around <strong>and</strong> aliased freely.:LinkedList:ListItr:Entry:Entry :Entry :Entry13.05.13© A. Poetzsch-Heffter, TU Kaiserslautern24
Meaning of alias modes:• Alias modes describe the role of an object relativeto an interface object• Informally: references with- default mode stay in the same bubble- rep-mode go from an interface object into its bubble- arg-mode may go to any bubble.:Dictionary:LinkedList:ListItr:Entry:Entry :Entry :Entry13.05.13© A. Poetzsch-Heffter, TU Kaiserslautern25
Page 1 and 2: 4. Object Structures, Aliasing,and
Page 3 and 4: Examples:(Object structures)1. A ve
Page 5 and 6: Problems:• Structural integrity (
Page 7 and 8: Undesirable Aspects of Aliasing:1.
Page 9 and 10: Forms of Alias Creation:Capturing:
Page 11 and 12: General approaches to solve alias p
Page 13 and 14: Examples:1. Immutable class:(Immuta
Page 15 and 16: class NotImmutableList extends Immu
Page 17 and 18: 4. Immutable objects with varying I
Page 19 and 20: 4.3 Alias Control and Encapsulation
Page 21 and 22: Roles in Object Structures:• Inte
Page 23: 2. Representations (rep mode):• E
Page 27 and 28: Programming Discipline (simplified)
Page 29 and 30: Example:(Representation exposure)-
Page 31 and 32: 4.3.2 Type-based EncapsulationType
Page 33 and 34: Connection with type systems:• Ea
Page 35 and 36: Scenarios in which references are i
Page 37 and 38: Remark:• The behavior of anonymou
Page 39 and 40: Further Structuring Techniques:Diff
Page 41 and 42: Cluster:Let G be the undirected gra
Page 43 and 44: Ownership:Idea:• Introduce an own
Page 45: The ownership relation is a binary

4. Object Structures, Aliasing, and Encapsulation

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