Internal and external iteration, fibers

[bearophile]

The author of the experimental language Magpie is very 
intelligent (in past I have read a very nice blog post about the 
unusual bootstrapped type system of Magpie). Here he nicely 
discusses well known things:

http://journal.stuffwithstuff.com/2013/01/13/iteration-inside-and-out/

Reddit thread:
http://www.reddit.com/r/programming/comments/16ja3f/iteration_inside_and_out/

A person on Reddit ("munificent", I think the blog post author 
himself) says that Magpie uses fibers to solve that dilemma, to 
be seen in a successive post.

In D the Range static protocol of iteration is external and 
opApply is internal. Some persons have suggested to use fibers in 
D to introduce a very handy "yield" syntax for internal iteration.

I think similarly short but clear article, about D Ranges and 
opApply should be added in the articles 
(http://dlang.org/articles.html ) section of the D site.

Bye,
bearophile