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In the Gaudi-framework, there exist several layers of print-statements. According to the level which is set (f. ex. in an options-file), any message with this level or higher will be printed.
Additionally the following constants are definded:
In your C++-code, you can add these statements the following way, f.ex:
if ( msgLevel(MSG::WARNING) ) warning() << "Could not retrieve tracks. Skipping" << endmsg;
All the other messages are printed by replacing “warning” with the appropriate level.