Allow for NSEnumerationOptions to be passed in to fast enumeration (for x in y)
| Originator: | zach | ||
| Number: | rdar://10981526 | Date Originated: | 04-Mar-2012 04:38 PM |
| Status: | Open | Resolved: | |
| Product: | Developer Tools | Product Version: | Apple clang version 4.0 (t/A/418.0.46) |
| Classification: | Enhancement | Reproducible: | N/A |
04-Mar-2012 04:38 PM Zach Drayer:
Fast enumeration, in the form of `for (x in y) {}` is a great way to enumerate over a collection of objects. However, there are times when it is not the most efficient way to enumerate over a collection.
Some of the time, the operation being performed in the loop can be done concurrently, in which case -enumerateObjectsWithOptions:usingBlock: is a better way to go. This is because it allows for the `NSEnumerationConcurrent` to be passed in when running the method.
It would be absolutely fantastic if fast enumeration was expanded to add `for (x in y with z) {}`, where `z` is a set of NSEnumerationOptions that can be passed in.
This is also very helpful because devices are shipping with more and more CPUs (Macs typically have 4 CPUs by now, and iPhone's/iPad's shipping at the moment can have 2 CPUs), and despite GCD being awesome, there are still times when it is hard for developers to fully take advantage of all of the CPUs available to them.
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