#ifndef __PROJECT__
#define __PROJECT__


class project : public Iterator
{

 public:
   project(AttrType in[],        // Array containing field types of R.
           int     len_in,       // # of columns in R.

           int     permutation_array[], // array of permutations.
                                 // If a field i is filtered out,
                                 // the value p_a[i] = -1. Else, if field i is
                                 // in position j in the output, p_a[i] = j.
           Iterator *am          // access method for left input to join.
         );

  ~project();

   ProjectError get_next_tuple(char * &tuple);     // The tuple is returned.

   void perror(ProjectError error_code); // Prints an error message correlated
                                         // to error_code
};

#endif