From: Jonathan Turkanis (technews_at_[hidden])
Date: 2005-02-17 13:00:41
Jonathan Wakely wrote:
> On Thu, Feb 17, 2005 at 12:48:35AM -0500, Jason Hise wrote:
>> I would have expected this code not to compile at all, because the ==
>> overload seems ambiguous. Is this result standards conforming? If
>> not, what would the standards conforming result be? Does this fall
>> into the realm of undefined behavior?
>
> No, you're first expectation was right - it's ambiguous, so it's an
> error.
>
> Comeau's online compiler rejects it, as does every version of GCC I
> can lay my hands on. Seems like a VC++ bug.
VC7.1 is resolving the ambiguity based on the order of the base classes, since
reversing them produces a different result. VC8.0 beta does the same, so it
should be reported, if it hasn't already been.
> jon
Jonathan