Transience of .front in input vs. forward ranges

[Andrei Alexandrescu]

On 11/6/12 3:06 AM, H. S. Teoh wrote:
> I've already given a number of
> non-trivial examples of transient forward ranges, and apparently
> deadalnix has also encountered the same issue.

I'd like to build more of this argument. I pointed out that your range 
is actually defining .dup, not .save. I think an argument can be made 
that forward ranges with transient .front do not qualify as forward 
ranges, seeing as a forward range is modeled after a list that actually 
has data sitting in memory.


Andrei