weighted round robin

[Marc Schütz via Digitalmars-d-learn]

On Saturday, 8 October 2016 at 22:48:53 UTC, vino wrote:
> Hi,
>
>  Can some one guide me on how to implement the weighted round 
> robin, below is what i tried or any other better ways to do it
>
> Main Requirement : Incoming socket connection has to be sent to 
> 3 servers in the weighted round robin fashion.
>
> Prog:1
> import std.stdio;
> import std.range;
> import std.range.primitives;
>
> void main()
> {
>     auto a = [1,2,3]; // E.g :Server Array
>     auto b = [1,2,3,4,5]; // E.g: Socket Array
>     auto r = roundRobin(a, b);
>     writeln(r);
> }
> OUTPUT : [1, 1, 2, 2, 3, 3, 4, 5]
> Requirement : [1, 1, 2, 2, 3, 3,1,4,2,5]

     auto r = roundRobin(a.cycle, b.cycle);

Beware though that this yields an infinite range. If you just 
need one round, you can use:

     import std.algorithm.comparison : max;
     writeln(r.take(max(a.length, b.length)));