[LLVMbugs] [Bug 18180] Compilation error with boost::optional (from Boost 1.55)

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Dec 9 00:25:44 PST 2013


Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #4 from Richard Smith <richard-llvm at metafoo.co.uk> ---
OK, I see what's happening -- in Clang 3.3 and GCC 4.8, 'false' is being
treated as a null pointer constant. boost::optional implicitly converts to an
"unspecified-bool-type" that happens to be a pointer-to-member type, and thus
can be compared against a null pointer constant via the built-in
operator!=(pointer-to-member, pointer-to-member) overload.

In C++11 onwards, 'false' isn't a null pointer constant any more, so this
comparison is no longer valid. Clang 3.3 and GCC 4.8 don't implement that rule;
Clang 3.4 does.


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