[LLVMbugs] [Bug 18176] cmath: compile failure with custom fabs in std namespace
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Sun Dec 8 10:05:27 PST 2013
http://llvm.org/bugs/show_bug.cgi?id=18176
Duncan <dexonsmith at apple.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |dexonsmith at apple.com
Resolution|--- |INVALID
--- Comment #2 from Duncan <dexonsmith at apple.com> ---
(In reply to comment #1)
> I'm not completely sure, but I think your code relies on undefined behavior.
> §17.6.4.2.1p1:
>
> | The behavior of a C++ program is undefined if it adds declarations or
> | definitions to namespace std or to a namespace within namespace std unless
> | otherwise specified. [...]
>
> And §D.5, where cmath is described, does not say that it is possible to add
> e.g. fabs for a custom type to std.
Yup. See also
<http://stackoverflow.com/questions/15104760/c11-overloading-not-specializing-templates-in-std-namespace>.
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