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The singleton is a design pattern aiming to ensure that only a single instance of a class can be created and used.

48 votes

When is Singleton appropriate?

However, silently, it is communicating with some sort of public, globabally available singleton object, so that whenever you instantiate the class, it contains different data. … To properly unit-test the code, you need to micro-manage and be aware of the global state in the singleton, to get consistent test results. …
Magnus Wolffelt's user avatar