"John Maddock" <[EMAIL PROTECTED]> wrote in news:[EMAIL PROTECTED]:
> The problem is that the question "is A convertible to B" has four > answers: yes, no, ill-formed, and ambiguous :-( > > John. Obviously, I think there should be only two :) That is, it would be nice to have a test that tells me the whether or not an assignment would or would not succeed. If I want to assign the result of an expression to a variable (or use it as a return value, etc), I don't particularly care WHY an assignment would fail. I just want to know whether it would or not. Perhaps it would be useful to have a set of tests that can tell you whether a conversion would fail for a specific reason, eg, conversion_is_ambiguous <X,Y>. But the real problem, as I see it, is that is_convertible<X,Y> can fail to compile for certain choices of X and Y. That defeats the purpose of the test -- why would I ask if I can convert an X to a Y if I must already know the answer to do so safely? -- Mike Conley _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
