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Hooks and unhooks read iterators in update queue. The opaque UpdateQueueReaderPool actually tracks the position of each iterator, this class just maintains a token that the reader pool uses.
| UpdateQueueReader (UpdateQueueImpl<A>* i) | UpdateQueueReader | 
| ~UpdateQueueReader () | ~UpdateQueueReader | 
| uint32_t  id () | id | 
[const]
| inline bool  parent_is (const UpdateQueueImpl<A>* o) | parent_is | 
[const]