Well, you could read the proposal? Using them in iterators is one of the use cases it specifically calls out. Hazard pointers are a key part of how Folly's Conc

Well, you could read the proposal? Using them in iterators is one of the use cases it specifically calls out. Hazard pointers are a key part of how Folly's ConcurrentHashMap lets you mutate the hash map without invalidating existing iterators into it, and while that's intended for multi-threaded cases it also works if the writes happen to be on the same thread as the read.