BloombergLP::bdlcc::FixedQueueIndexManager::abortPushIndexReservation

Release the specified index and make it available for use in the generation following the specified generation. The behavior is undefined unless the calling thread holds a reservation on generation and index, and clearPopIndex and then commitPushIndex have been repeatedly invoked with generation and index as input until no indices remain to clear. Note that this operation is used to facilitate removing all the elements in a circular buffer if an exception is thrown between reserving an index for pushing, and committing that index.