Singleton vs factory?

Question

I have 3 log classes that all implement the iLog interface:

DatabaseLog
FileLog
ScreenLog

there can be only one instance of them. at first I used one template for each class, but then I thought, why not use a factory to create an instance instead, so I don’t have to create a single template for each of them and for all future journal classes.

and maybe someone will want them as several objects in the future.

so my questions are: should i use factory or singleton pattern here?

Answer 1

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Answer 2

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Answer 3

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Answer 4

Like others, I also suggest using factory. One advantage when not using Singletons is that you do not have a global state, which makes your code much more verified.

Answer 5

I would use a factory here, singleton cannot satisfy your single instance requirements between all three classes.