// In header: <boost/iterator/pipe_concept.hpp>

template<typename X> 
struct PipeConcept :
  public DefaultConstructible<X>, private CopyConstructible<X>
{
  // types
  typedef X::input_type  input_type;                 
  typedef X::output_type output_type;                
  typedef unspecified    boost_concept_check__LINE__;

  // construct/copy/destruct
  ~PipeConcept();
};