[boost] Re: A question to preprocessor gurus

From: Jan Bares (herkule9s_at_[hidden])
Date: 2004-04-21 02:00:45

In fact I belive that __COUNTER__ was introduced because the solution with
__LINE__ did not worked when you compile with Edit & Continue ON. In that
case the __LINE__ was in fact a variable.

Jan

"Paul Mensonides" <pmenso57_at_[hidden]> wrote in message
news:200404200944.i3K9iuO1023897_at_milliways.osl.iu.edu...
> > -----Original Message-----
> > From: boost-bounces_at_[hidden]
> > [mailto:boost-bounces_at_[hidden]] On Behalf Of Arkadiy Vertleyb
>
> > The MS preprocessor has the __COUNTER__ extension that
> > expands to the next integer every time when used.  Can
> > something like this be achieved in a portable manner, maybe
> > with the help of Boost.Preprocessor library?
>
> The best you can do in standard C++ is __LINE__.  If you need varying
numbers
> all in the same place (i.e. the same header), you can manually keep track
of a
> counter.  It is also possible to hijack the #include mechanism to provide
a
> different number each time a file is included or something like that.  In
any
> case, the ways of doing it are a lot more heavyweight than __COUNTER__,
but a
> lot more standard too.
>
> Regards,
> Paul Mensonides
>
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