C++问题（2021-09-23-01）：下面的代码如何理解？

问题1：下面如何理解？

 /**
 * @brief The MediaEvent struct defines media event for plugins communication via Media Framework event loop.
 * Event is sent as serialized data. Also could be transfered via TransportService.
 *
 * Should not be used in plugins directly, convert it to StrongMediaEvent.
 * Don't create this events in new code.
 * @see com::clarion::media::Event
 * @deprecated
 */
struct MediaEvent
{
    eMediaEvents evID; /**< Event type identifier*/
    int priority; /**< Event priority, defined by eMediaEventPriority enum*/
    u_int32_t index; /**< Set by Media Framework for event object identification*/

    char* payload; /**< Media event owns payload, so payload to have only trivial destructor.
                        This payload is processed by Serializer and Deserializer helpers.*/
    size_t payloadSize; /**< Payload size in bytes, used by deserializer. */

    //initialization and cleanup
    MediaEvent() : evID (MEDIAE_START), priority(0), index(0), payload(nullptr), payloadSize(0) {}
    ~MediaEvent() { delete [] payload;}

    //make it non copyable and non moveable
    //force to use heap
    MediaEvent(const MediaEvent&) = delete;
    MediaEvent(const MediaEvent&&) = delete;
    MediaEvent& operator = (const MediaEvent&) = delete;
    MediaEvent& operator = (const MediaEvent&&) = delete;
};

比如这一句MediaEvent(const MediaEvent&&) = delete;中的&&和= delete表示啥？