[boost] Re: [constant] New version + YANL-example available

From: Jonathan Turkanis (technews_at_[hidden])
Date: 2004-01-26 14:38:17

"Daniel Frey" <daniel.frey_at_[hidden]> wrote in message
news:bv3o69$me3$1_at_sea.gmane.org...
> Beman Dawes wrote:
> At 10:59 AM 1/26/2004, David Abrahams wrote:
>  >Daniel Frey <daniel.frey_at_[hidden]> writes:
>  >
>  >>And I use __typeof__, which I don't know
>  >
>  >I haven't been paying too much attention, but I sure hope we don't
>  >have a [proposed] boost library which relies on the presence of
>  >nonstandard language extensions (__typeof__) for its operation
here.
>
> Particularly since the C++ committee hasn't agreed on final specs
for
> __typeof__, or whatever it ends up being called. The specs may
change
> quite a bit before a final vote is taken. This isn't a case of some
> compiler vendors just being slow to implement something the
committee
> has already blessed.
>
> Dave's choice of the word "relies" is a key point. Lots of Boost
> libraries make use of nonstandard compiler extensions if available,
but
> have useful fallbacks if the extension isn't available. Thus they
don't
> rely on the extension for correct operation.

Hm, I could ask the user to specify the result type of each operator
call for some types T and U for all platforms/compilers that don't
support __typeof__. Is that what you had in mind?

There's always this:

   http://www.accu-usa.org/2000-05-Main.html

I've never found it helpful when I really wanted to use typeof,
however.

Jonathan