problem in understanding the 4 argument of .AddTraceSource

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Kapil Kumar sharma

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Feb 25, 2020, 6:37:41 AM2/25/20

to ns-3-users

.AddTraceSource ("CourseChange",
"The value of the position and/or velocity vector changed",
MakeTraceSourceAccessor (&MobilityModel::m_courseChangeTrace),

"ns3::MobilityModel::CourseChangeCallback")

l have problem in understanding what the last argument means. From what i have understood from the previous example was that in "ns3::MobilityModel::CourseChangeCallback" meant a typedef for the tracedvalue type