4. Object Structures, Aliasing, and Encapsulation
4. Object Structures, Aliasing, and Encapsulation
4. Object Structures, Aliasing, and Encapsulation
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Alias control <strong>and</strong> encapsulation techniques areanother approach to reduce aliasing problems:1. Side-effects are simpler to control.2. Consistent access to objects can be achieved.3. By-passing of interface operations can be avoidedOverview:• Notions of alias control• Type-based encapsulation<strong>4.</strong>3.1 Notions of Alias ControlWe need better control over the objects in an objectstructure to avoid aliasing problems.Approach: Alias modes:- Define roles of objects in object structures- Assign a tag (alias mode) to every expression to indicatethe role of the referenced object- Impose programming rules to guarantee that objects areonly used according to their alias modes13.05.13© A. Poetzsch-Heffter, TU Kaiserslautern20
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