How to add callback to tell owner something

["rion10 (sent by Nabble.com)" <lists nabble com>]

How to tell the owner that something has done at one function in my class?
Just like as following:
main()
{
  TMyClass me;
  me.DoSomething(); //not done yet if the function return
  ...
}

void TMyClass::OnSomeEvent()
{
  if (something has done) {
    //Add a callback to tell owner that the transfer is done, how to do it?
  }
}

Thanks a lot

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How to add callback to tell owner something