Re: [Boost-users] [preprocessor] Argument list conversion

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-06-16 07:18:43

Server Levent Yilmaz wrote:
> I did somehow come up with this dirty trick, though it doesn't quite cut it:
> 

<snip code>

> 
> any ideas?
> 

Yep, here's another dirty trick ;-):

     #include <boost/preprocessor/detail/is_unary.hpp>

     #define SPECIAL (whatever)
     #define IS_SPECIAL BOOST_PP_IS_UNARY

     IS_SPECIAL(a)         // 0
     IS_SPECIAL(b)         // 0
     IS_SPECIAL(SPECIAL)   // 1

It isn't entirely portable to older preprocessors (that's why this code 
lives in preprocessor/detail) but should work with latest versions of 
the widely-used compilers.

Regards,
Tobias