[cfe-dev] pair bug in clang (and libc++)
dblaikie at gmail.com
Tue Jun 12 14:58:57 PDT 2012
> It appears that VC11's STL has found a bug in clang.
> says "This code is simplified one from clang project and you can get the
> same error trying to compile clang using vc110." (They didn't mention where
> the offending code was, but it should be easy enough to find.)
Thanks for forwarding this on,
> The issue is that when A has a user-defined conversion to B and B has a
> user-defined conversion to C, C++03/VC10 permits pair<A, X> to be converted
> (explicitly or implicitly) to pair<C, X>, while C++11/VC11 forbids this
> because A is not implicitly convertible to C.
Yeah, it was surprising this was around as long as it was (as you
point out, in part because of bugs in other libstdc++/libc++) but it
was fixed a few days ago in
> Presumably, this also indicates that libc++ hasn't constrained its pair (and
> tuple!) as specified by C++11. So, two bugs for the price of one.
Yep, http://llvm.org/bugs/show_bug.cgi?id=13063 fixed in
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