[Boost-users] [mpl] equal_to compile problems

Subject: [Boost-users] [mpl] equal_to compile problems
From: Olaf Peter (ope-devel_at_[hidden])
Date: 2008-09-19 08:51:14

Hi,

my first steps in mpl are very rough. I have

     enum {
     RELEASE_LEVEL  = (10 <<  4),
     ...
     };

and want to check on an appropriate enum number:

#include <boost/mpl/equal_to.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/placeholders.hpp>

namespace {

     namespace mpl = boost::mpl;
     using namespace mpl::placeholders;

     typedef mpl::equal_to<_1, mpl::int_<0xC> >::type
                     release_candidate;
}

...
if(release_candidate<RELEASE_LEVEL>::value)
    return a;
else
    return b;

which doesn't compile. Where is my fault and how can I fix it?

Thanks,
Olaf