////  SentPacketHistory.h//  libraries/networking/src////  Created by Yixin Wang on 6/5/2014////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #ifndef hifi_SentPacketHistory_h#define hifi_SentPacketHistory_h #include <stdint.h> #include <QtCore/QByteArray>#include <QtCore/QReadWriteLock> #include "NLPacket.h"#include "RingBufferHistory.h"#include "SequenceNumberStats.h" class NLPacket; class SentPacketHistory { public:    SentPacketHistory(int size = MAX_REASONABLE_SEQUENCE_GAP);     void untrackedPacketSent(uint16_t sequenceNumber);     void packetSent(uint16_t sequenceNumber, const NLPacket& packet);    const NLPacket* getPacket(uint16_t sequenceNumber) const; private:    mutable QReadWriteLock _packetsLock { QReadWriteLock::Recursive };    RingBufferHistory<std::unique_ptr<NLPacket>> _sentPackets;    // circular buffer     uint16_t _newestSequenceNumber;}; #endif