Flatten range of ranges

[Graham Fawcett]

On Thu, 06 May 2010 19:01:04 +0200, Philippe Sigaud wrote:

> On Thu, May 6, 2010 at 18:24, Ali Çehreli <acehreli at yahoo.com> wrote:
> 
>> Ali Çehreli wrote:
>>
>>> new to d wrote:
>>>
>>>> Is there any function in phobos that does something like that:
>>>>
>>>> auto a = [[1,2],[3,4]];
>>>> assert(equals(flatten(a), [1,2,3,4]));
>>>>
>>>> I am just learning D and ca't find anything like that in the docs.
>>>>
>>>>
> I've this in a dsource project:
> 
> http://svn.dsource.org/projects/dranges/trunk/docs/range2.html (look for
> flatten or concat). It's a lazy range. Flatten depends on a template for
> wrapping code, present in the traits2 module.
> 
> http://www.dsource.org/projects/dranges/browser/trunk/range2.d
> http://www.dsource.org/projects/dranges/browser/trunk/traits2.d
> 
> Hmm, this is waiting for quite an update. I've lots of thing for
> producing/mapping/filtering... ranges of ranges while conserving their
> topology/rank.
> If you find anything useful for you in this project, tell me!

These are great! Thank you. Coming from some of the languages that you 
cite as inspirations, I found the limited set of range HOFs in D2 to be 
really unfortunate. Your project fills the gap!

Best,
Graham