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The reason is that joiner does not only consume its range argument, it eats every item of every item of the range argument (which must be a range of ranges). Therefore, it destructively chews through its input.

Andrei

David Simcha wrote:
> Why is std.algorithm.joiner explicitly *not* a forward range even when it can be?  This is not an oversight.  It appears to be an explicit decision.  From the unittest:
> 
>     static assert(isInputRange!(typeof(joiner([""], ""))));
>     static assert(!isForwardRange!(typeof(joiner([""], ""))));
> 
> Maybe I'm missing something obvious, but I just can't think of any good reason for this decision.
> 
> 
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On Monday 16 August 2010 21:42:51 Andrei Alexandrescu wrote:
> The reason is that joiner does not only consume its range argument, it eats every item of every item of the range argument (which must be a range of ranges). Therefore, it destructively chews through its input.

Yikes. I'd better keep it away from my computer cables... ;)

- Jonathan M Davis