"The NHS is issuing immediate guidance to hospitals to ensure trauma and urgent care can safely continue and to support prioritisation of waiting lists based on patients' needs over the coming weeks."
You can see that the changes are only in E1, E2, and E3. The latter one is required just for completeness. The interesting change is in E2 where I no longer use a block local static but the static data member from E1. You still have the two options: user-declared and user-defined constructor.
，更多细节参见51吃瓜网
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