http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58319

--- Comment #2 from Pawel Sikora <pluto at agmk dot net> ---
(In reply to Paolo Carlini from comment #1)
> Your cast does nothing, because your typeof (or decltype) is just unsigned
> int. Given that, the warning makes sense to me and certainly is well known.

so how can i cast this value to avoid warning?

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