[boost] [mpl] mpl::is_sequence problem

From: Joel de Guzman (joel_at_[hidden])
Date: 2005-12-21 20:16:26

Hi,

A few months ago, I had a problem with mpl::is_sequence. It seems
that the problem is not yet fixed. Anyway, to simplify, here's
the code that exhibits the problem:

     #include <boost/mpl/is_sequence.hpp>

     int
     main()
     {
         bool r = boost::mpl::is_sequence<boost::mpl::int_<0> >::value;
         return 0;
     }

The code does not compile on all compilers that I use regularly
(VC++, g++ and Comeau). Here's a another code that does not compile:

     #include <boost/mpl/is_sequence.hpp>

     struct x
     {
         typedef int tag;
     };

     int
     main()
     {
         bool r = boost::mpl::is_sequence<x>::value;
         return 0;
     }

Is there any chance for this to be fixed in the immediate future?
I rely on mpl::is_sequence for constrained genericity and concept
checking in fusion.

Regards,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net