Range of Ranges and std.algorithm

Jesse Phillips jessekphillips+D at gmail.com
Tue Mar 16 09:35:55 PDT 2010

I'm guessing that containers will help with this, but I'm not sure how.

Say I have an int[][] of unknown length and I want to get the setIntersection of all int[]s. The only way I can see to do that is to intersect the first two elements and iterate over them storing into an int[] which can be used in an intersection with the next element...

I realize that a Range is meant to be view of a container, but it seems to me that containing a Range can be just as useful. How might containers improve this situation?

import std.algorithm;

void main() {
   auto lists = [[1,2,3,4,5],

   //assert(setIntersection(lists) == [2]);
   auto result = setIntersection(lists[0], lists[1]);

   foreach(range; lists)
      result = setIntersection(result, range);


.\setint.d(13): Error: cannot implicitly convert expression (setIntersection(res
ult,range)) of type SetIntersection!(less,SetIntersection!(less,int[],int[]),int
[]) to SetIntersection!(less,int[],int[])

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