Traversable vs Iterable

[Paul Sandoz]

Hi Boaz,

We recently merged Traversable into Iterable:

http://hg.openjdk.java.net/lambda/lambda/jdk/rev/b93e380a7834

Paul.

On Oct 30, 2012, at 11:47 AM, Boaz Nahum <boaznahum at gmail.com> wrote:

> I'm just trying to understand the design guidelines
> 
> /**
> * Implementing this interface allows an object to indicate that it provides
> * the {@code forEach} method for internal iteration.
> */
> public interface Traversable<T> extends Iterable<T> {
> 
> 
> In which case we want to prevent this ability from *Iterable* ?
> 
> If we can always write:
> 
> Iterable<T> it = ...
> 
> for(T t:it) {}
> 
> Why can't we:
> it.forEach(...)
> 
> 
> Thanks
> Boaz
>