More n3644 changes - forward_list and deque

Marshall Clow mclow.lists at
Tue Aug 6 07:23:03 PDT 2013

This one is quite straightforward.

Comparing a value_initialized iterator to a non-value initialized iterator is supposed to be undefined behavior.
I'd really like it if libc++'s debug mode could catch that, but I don't really see how (at least for vector/array/deque/forward_list).

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki
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