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


struct accumulator_base {
  // types
  typedef mpl::false_ is_droppable;

  // public member functions
  unspecified operator()(dont_care);
  unspecified add_ref(dont_care);
  unspecified drop(dont_care);
  unspecified on_drop(dont_care);
};