Update hazard pointers prototype
Summary: Interface: - Got rid of std::function reclamation functions and added a Deleter template parameter. - Got rid of the flush() member functions of hazptr_domain - Added a lock-free non-bool member function to get a protected pointer. Implementation: - Implemented the interface changes. - Changed the order of accesses in reading the shared list of objects vs reading the hazard pointers. I think the previous order would have allowed recently protected objects to be reclaimed incorrectly. Updated the examples and tests accordingly. Reviewed By: davidtgoldblatt Differential Revision: D3981284 fbshipit-source-id: 35ff60da3aea1f67c58d82437dda58f6d8b07bf5
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