Is there a smart way to process a range of range by front ?

[BBasile via Digitalmars-d-learn]

On Wednesday, 23 September 2015 at 21:17:29 UTC, BBasile wrote:
> On Wednesday, 23 September 2015 at 21:04:44 UTC, Justin Whear 
> wrote:
>> On Wed, 23 Sep 2015 20:48:03 +0000, BBasile wrote:
>>
>>> I was thinking to a general *interleave()* algorithm for any 
>>> compatible Range of Range but I can't find any smart way to 
>>> process each sub range by front
>>
>> Can you show a sample input and output to clarify what you 
>> mean by interleave?  It's possible that what you want is 
>> std.range.frontTransversal, std.range.transversal, or 
>> std.range.transposed.
>
> ---
> auto r0 = [[0,2],[1,3]];
> auto r1 = interleave(r0);
> assert(r1 = [0,1,2,3]);
> auto r2 = [[0,3],[1,4],[2,5]];
> auto r3 = interleave(r2);
> assert(r3 = [0,1,2,3,4,5]);
> ---
>
> the fact that the numbers are ordered is just an helper.

just imagine that there are double equal symbols in the 
assertions...