On Thu, Jun 6, 2013 at 7:22 PM, Bill Myers <bill_my...@outlook.com> wrote:
> Scala has a similar design, with the following traits: > - TraversableOnce: can be internally iterated once (has a foreach() method > that takes a closure) > - Traversable: can be internally iterated unlimited times (has a foreach() > method that takes a closure) > - Iterable: can be externally iterated (has an iterator() method that > returns an Iterator trait) > > The way it works is that Iterable extends Traversable, which extends > TraversableOnce, and the for loop just uses TraversableOnce, and Iterable > has a default implementation of the TraversableOnce foreach() function > using the iterator() function. > > Also, the Iterator trait itself extends TraversableOnce, implementing > foreach() by mutating itself. > > It might be a good idea to investigate copying this design. > I find Andrei Alexandrescu's argument about range-based iterators pretty persuasive: http://www.informit.com/articles/article.aspx?p=1407357 Seb
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