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O RPHANS, A DOPTION, AND S URROGATES S INGLETONS Josh Mason June 1, 2009
A DOPTION AND O RPHAN Adoption Taken ownership of object Orphan Relinquish object What’s the purpose? Deciding where to put adoption/orphan functions Component? Leaf? Composite? Case by case basis.
S INGLETON Creational Pattern Restricts instantiation of a class to a single instance
U SES To implement other patterns Abstract Factory Builder Prototype Façade State Objects
S INGLETON - B ENEFITS Single Instance Controlled Access Reduced Namespace Lazy Initialization Easily extends to allow for a variable number of instances. Can assist in making thread safety simpler.
S INGLETON - E XAMPLES Traditional static MyClass* Instance(); Alternative 1 static MyClass* Instance(int i_id); static MyClass* Cleanup(int i_id); Alternative 2 static Create(int i_val, float i_val2); static MyClass* Instance(); static Cleanup();
S TINKLETON * - I SSUES Why not just use global variable? An anti-pattern? Creation Cleanup Tight coupling * Robert Penner
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Design Pattern. The Observer Pattern The Observer Pattern defines a one-to-many dependency between objects so that when one object changes state, all.
Creational Design Patterns. Creational DP: Abstracts the instantiation process Helps make a system independent of how objects are created, composed, represented.
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Factory Method A Creational Design Pattern. Factory Method Key Features Defines an interface for creating objects without needing to know each object’s.
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