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Chapter 7 Listing 7.5 lock_free_stack::pop

Quick question. After this line in lock_free_stack::try_reclaim

node *nodes_to_delete = to_be_deleted.exchange(nullptr);

Isn't the current thread the only one with a pointer to nodes_to_delete? So why isn't it safe to delete nodes_to_delete at this point even if threads_in_pop is greater than zero?

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Sorry - this question is answered further in the text book.