> Optimizations are only possible if iterator-style APIs are used They make it simpler, but it also is possible to detect that loops are iteration-style access

> Optimizations are only possible if iterator-style APIs are used They make it simpler, but it also is possible to detect that loops are iteration-style access in disguise. That takes time, so its more likely to happen in ahead of time compiled languages. C compilers can vectorize some of such loops, so they have logic for doing that.