#include <boost/static_assert.hpp>
#include <boost/mpl/apply_if.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/mpl/int.hpp>

using namespace boost;


template<class ErrorMessage>
class COMPILE_TIME_ERROR {
    typedef typename ErrorMessage::oops type;
};

class Life_is_hard {};
class Life_is_very_hard {};

int main()
{
    mpl::apply_if<mpl::int_<0>, mpl::identity<int>,
		COMPILE_TIME_ERROR<Life_is_hard> >();
		
//    COMPILE_TIME_ERROR<Life_is_very_hard>();		

    return 0;
}