Re: Idiomatic adjacent_difference

[Guillaume Chatelet via Digitalmars-d-learn]

On Friday, 16 October 2015 at 11:38:35 UTC, John Colvin wrote:
import std.range, std.algorithm;
auto slidingWindow(R)(R r, size_t n)
if(isForwardRange!R)
{
        //you could definitely do this with less overhead
        return roundRobin(r.chunks(n), r.save.drop(1).chunks(n))
                .filter!(p => p.length == n);
}

auto adjacentDiff(R)(R r)
{
        return r.slidingWindow(2).map!"a[1] - a[0]";
}

Nice !
I wanted to use lockstep(r, r.dropOne) but it doesn't return a 
Range :-/
It has to be used in a foreach.