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Asked: 2026-05-10T15:44:06+00:00

I’ll soon be posting an article on my blog , but I’d like to

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I’ll soon be posting an article on my blog, but I’d like to verify I haven’t missed anything first.

Find an example I’ve missed, and I’ll cite you on my post.

The topic is failed Singleton implementations: In what cases can you accidentally get multiple instances of a singleton?

So far, I’ve come up with:

  • Race Condition on first call to instance()
  • Incorporation into multiple DLLs or DLL and executable
  • Template definition of a singleton – actually separate classes

Any other ways I’m missing – perhaps with inheritance?

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1 Answer

  1. If you use a static instance field that you initialize in your cpp file, you can get multiple instances (and even worse behavior) if the initialization of some static/global tries to get an instance of your singleton. This is because the order of static initialization across compilation units is undefined.

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