// In header: <boost/accumulators/framework/depends_on.hpp>

template<typename Feature1, typename Feature2, ... > 
struct depends_on {
  // types
  typedef mpl::false_                                                                         is_weight_accumulator;
  typedef mpl::transform< mpl::vector< Feature1, Feature2,...>, as_feature< mpl::_1 > >::type dependencies;         
};