This function logs data to the used Logger in a
printf-style manner.
In order for the resulting log message to be logged the LogLevel must
be greater or equal than the LogLevel of the used Logger and
must be greater or equal than the global LogLevel.
autos = newFileLogger(stderr);
s.tracef("is number %d", 1);
s.infof("is number %d", 2);
s.errorf("is number %d", 3);
s.criticalf("is number %d", 4);
s.fatalf("is number %d", 5);
This function logs data to the used Logger in a printf-style manner.
In order for the resulting log message to be logged the LogLevel must be greater or equal than the LogLevel of the used Logger and must be greater or equal than the global LogLevel.