[Issue 3123] std.algorithm.zip fails on 'lazy' ranges

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3123



--- Comment #4 from Kyle Foley <k-foley at onu.edu> 2009-10-25 21:13:39 PDT ---
(In reply to comment #2)
> Created an attachment (id=481) [details]
> Zip fixes

I changed Proxy to store by reference for ranges supporting reference return
types and by value otherwise.  I also changed Zip to only support back and
popBack when all ranges are bidirectional.  And I also changed Proxy.at to
return by reference.

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