Multiple ChoiceIntermediate 45s
shared_ptr cycle leak
Two objects hold `shared_ptr` to each other. Why do they leak, and what fixes it?
Options
- 1They do not leak; shared_ptr detects cycles and frees them.
- 2The reference counts never reach zero; break one direction with a weak_ptr.
- 3They leak only if make_shared was not used; call reset() on both to fix.
- 4They leak because shared_ptr is not thread-safe; use a mutex.
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