transversal sum

[Justin Whear via Digitalmars-d-learn]

On Thu, 06 Nov 2014 17:08:23 +0000, Justin Whear wrote:

> I think the correct solution
> will make use of std.range.frontTraversal, but it will be a bit more
> complex due to needing to sum every column.  std.range.traversal would
> make it easy, but it requires random access.

That should be std.range.frontTransversal and transversal.