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Which statement about std::shared_ptr's reference count is correct?

A It is updated atomically, which has a measurable cost
B It is not thread-safe
C It is stored inside the managed object
D It never decrements

Answer

It is updated atomically, which has a measurable cost

The atomic count makes shared_ptr safe to copy across threads but slower than unique_ptr, so it should be used only when ownership is genuinely shared.

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