[cfe-dev] [patch] [libc++] missing difference_type in advance implementation

[Gonzalo BG]

The following patch fixes some missing difference_type
in the implementation of std::advance. The problem is that
depending on the type of

iterator_traits<Iterator>::difference_type

otherwise valid code fails to compile (this was the case for
my code), and warnings might show up.

Bests,
Gonzalo BG

P.S.: libcxx.llvm.org should have a small section explaining
the best way to contribute patches. I hope I posted the patch
in the correct mailing list.
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