On 13 November 2010 23:32, Sven Barth wrote: > On 13.11.2010 20:56, Hans-Peter Diettrich wrote: >> >> In general, what's the benefit of using enumerators? IMO a for loop >> executes faster on (linear) string and array types, where enumerator >> calls occur in for-in (see also my note on the UTF-8 string example). > > I'd say they simplify the code. They might not make the code faster (or even > make it slower), but they make it easier to read/understand.
I never saw the first post, but I'll reply from here.. If you use full-blown Iterator classes (instead of just for-in style) you get a lot more too: * full control over iteration - move forward - move back - reset iteration - peek forward/back - skip, etc... * you can extent it with regular expressions to only iterate what is applicable, and what matches the regex. * you completely hide the container implementation (TList, TObjectList, TFPList, etc) and simply supply the developer with a consistent iteration interface. So even if the container implementation changes, the higher level iteration code will not. I have implemented such Iterator classes for all the most used container classes in the RTL, and they work a treat! -- Regards, - Graeme - _______________________________________________ fpGUI - a cross-platform Free Pascal GUI toolkit http://opensoft.homeip.net:8080/fpgui/ _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
