This singleton base & factory can be used to instantiate all singletons at once.

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SingletonBase

• Ensures that only one instance of a derived class will exist.
• This is implemented in a thread-safe way using Lazy.
• It also ensures that the derived class has a private or protected constructor by throwing an exception at run-time.

Examples

• This mock class shows a example use-case.

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SingletonFactory

• Can be used to instantiate ALL classes that derive from SingletonBase.