PH page 18-24 GoF Singleton p. 127-134 Emanuel Ekstrom.

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Presentation transcript:

PH page 18-24 GoF Singleton p. 127-134 Emanuel Ekstrom

Orphans & Adoption Context: Making a file system. Three objects: Node, File, Directory. Why do we need to adopt? Why do we need to orphan? Who gets an adopt/orphan interface? So are they all the same?

Singleton Intent: ”Ensure a class only has one instance, and provide a global point of access to it.”

Discussion Who needs only one instance? What is good about a global access point? Why not global variables instead?

How do we make a Singleton? (GoF p. 131) Constructor protected Public static Instance() function. Is this enough?

Discussion What if we want to delete a Singleton? What if a deleted Singleton is called? Is there a solution to the problem?

Subclassing Problem: Making sure the subclasses are unique and that the clients can access it. How is this solved? Drawbacks?