What do you call a "singleton" that allows a public constructor for additional instances?

I'm making a class that supports the Singleton use (one instance is available), yet it also supports normal instance use (via a public constructor).

If you only want one, use that one. If you want 5, new them up.

I clearly can't call this singleton,开发者_高级运维 or some other dev will come along and make my constructor non-public. What can I call this to indicate how it is to be used? Naming is hard.

Some guesses for your amusement: "StaticallyAvailable"? "ThreadReady"? "SingletonOptional"?

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It sounds like you've got a "default instance". You could name your object along those lines.

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Usually the point of a singleton is for an object that has an unique instance. If multiple copies of the class can exist, then it means that "oneness" is not a necessary behavior. This is just like any other object.

Probably, the reason why you code it as a Singleton is for the global access. Just call it a global object then.

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A Pool ?

(esp if you know how about the instance count early, but want to encapsulate some of the behaviour of constructing / destroying)

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This does not sound like a singleton to me, it sounds like a regular class that always has at least one instance. Calling this a singleton, and writing the code as though it was one (eg. private static MySingleton instance = new MySingleton();) is confusing - decouple the "always present" instance from your class definition somehow. Make it clear in your implementation that this is a normal class that just happens to always have at least 1 instance around.

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You could create a default instance getter.

private TheClass defaultInstance;
public Default{ get{ return defaultInstance??(defaultInstance = new TheClass());}