using lock_guard = std::unique_lock<decltype(watch_lock)>;
using unique_lock = std::unique_lock<decltype(watch_lock)>;
using shared_lock = boost::shared_lock<decltype(watch_lock)>;
using shunique_lock = ceph::shunique_lock<decltype(watch_lock)>;
ceph源码——using关键字
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转载自my.oschina.net/itfanr/blog/1825174
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