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Structural Patterns

Structural Patterns. Class patterns – inheritance Object patterns – composition - you can change the composed class at run-time. class UsefulClass useful_operation() Class NicksClass UsefulClass myUsefulClass; nicks_operation() { myUsefulClass.useful_operation() }.

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Structural Patterns

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  1. Structural Patterns Class patterns – inheritance Object patterns – composition - you can change the composed class at run-time

  2. class UsefulClass useful_operation() Class NicksClass UsefulClass myUsefulClass; nicks_operation() { myUsefulClass.useful_operation() }

  3. OtherClass Request()

  4. Bridge Abstraction – the set of operations a class or class hierarchy must support Implementation – Different ways of performing those operations

  5. DataImp UpdateData changeGrade(name…) changeGrade(name…) SQLupdate PickleUpdate changeGrade(name…) { Send SQL update cmn To database changeGrade(name…) { Read in data, change it, Write to file

  6. DataImp UpdateData changeGrade(name…) changeGrade(name…) ? ? SQLupdate PickleUpdate changeGrade(name…) { Send SQL update cmn To database changeGrade(name…) { Read in data, change it, Write to file

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