Alias this with array can only be used once

[Simen Kjærås]

On Wed, 22 Feb 2012 23:16:41 +0100, Blake Anderton <rbanderton at gmail.com>  
wrote:

> Why doesn't this work? I'm assuming I'm not fully understanding how  
> "alias this" interacts with ranges (i.e. the range isn't being reset  
> after count is finished with it), but I'm not sure how to fix this  
> either:
>
> import std.algorithm;
>
> class ArrayContainer
> {
>      int[] values;
>      this(int[] v) { values = v; }
>      alias values this;
> }
>
> void main(string[] args)
> {
>      auto c = new ArrayContainer([1, 2, 3]);
>      assert(count(c) == 3); //succeeds
>      assert(c.length == 3); //FAILS - is actually zero
> }

That's interesting. The thing that happens is the function popFront
is callable on ArrayContainer, and popFront mutates its parameter.
The solution is to use count(c[]), but I'm not so sure I agree with
the way this works currently.