这三个类是什么关系(uml),该如何处理

class CWorker{public:    void Do();};class CWorkerMgr{    CWorker m_oWorker[10];public:    CWorker* GetWorker(int iId)    {        return &m_oWorker[iId];    }};class CWorkProxy{    CWorkerMgr m_oWorkerMgr;public:    void Do(int iId)    {        CWorker* pWorker = m_oWorkerMgr.GetWorker(iId);        pWorker->Do();    }};