Gennaro Prota <[EMAIL PROTECTED]> writes:
> I apologize for the tardy reply but, as it often happens, it was late
> night here when I received your post.
>
> On Sun, 08 Dec 2002 18:20:27 -0500, David Abrahams
> <[EMAIL PROTECTED]> wrote:
>
>>Gennaro Prota <[EMAIL PROTECTED]> writes:
>>> Actually, you "fall" into using
>>> SOME_COMPILER_MACRO1 but, luckily, the whole test yields false
>>"un"-----------------------^
>
> I seize the opportunity to improve my English: what is "un"? An
> exclamation? I guess it means ironically: "Well, what a luck!", but I
> would like a confirmation... you may well see how unhinged my English
> is :-s.
No, I just meant that a falsely succeeding test is very _unlucky_.
> Implementing it as
>
>
> #define BOOST_WORKAROUND(symbol, test) \
> ( BOOST_JOIN(symbol, 1) && symbol test)
>
> solves that problem but we should see if BOOST_JOIN actually works on
> all the supported compilers (in other words, if we don't need the
> workarounds that are in cat.hpp).
>
> Probably with some further machinery it is possible to end up with
> something like BOOST_ALWAYS_UNDEFINED(unexpanded symbol argument)_1
> (but I've not tried), however as I said, all things considered, I
> would just use
>
> #define BOOST_WORKAROUND(symbol, test) ((symbol != 0) && symbol test)
>
I'd like to change that as follows:
#define BOOST_WORKAROUND(symbol, test) ((symbol != 0) && (symbol test))
Just in case.
> I do know that for us keen on C++ programming your form is more
> seductive, but I think we should resist :-)
I agree.
> What this discussion shows is that there's no way (at least we
> didn't find any) to emulate the preprocessor defined operator, even
> if we limit ourselves to testing macros that (if defined) expand to
> preprocessing-numbers.
Sounds good to me.
--
David Abrahams
[EMAIL PROTECTED] * http://www.boost-consulting.com
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