How to make the cleanest code when reporting progress to a user?

Question

I\'ve struggled for the last couple of months to come up with some clean code to report progress to a user. Everything always seems to boil down to:

ReportProgr         


        

Answer 1

It would be natural to have the reporting inside the doTask() calls.
Typically the reporter would be a singleton that all the objects sent messages to and a reporter class was reponsible for deciding if and where to show it - statusbar, log file, stderr etc.