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Multiple ChoiceBeginner 45s

Function-Local Static Initialization Guard

Since C++11, initialization of a function-local static variable is:
Options
  1. 1Unspecified, so concurrent first calls may race on the partial object
  2. 2Thread-safe; concurrent first calls synchronize on completion
  3. 3Made constexpr only, forcing the initializing expression to be constant
  4. 4Guarded only if the initialized type is trivial, no guard otherwise
staticmagic-staticsthread-safety

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