#ifndef IRREGULAR_H
#define IRREGULAR_H

#include <mpi.h>

class Irregular {
 public:
  Irregular(MPI_Comm);
  ~Irregular();

  void pattern(int, int *);
  int size(int);
  int size(int *, int *, int *);
  void exchange(char *, char *);

 private:
  int me,nprocs;

  int patternflag;           // UNSET,SET
  int sizestyle;             // NONE,SAME,VARYING

  int self;                  // 0 = no data to copy to self, 1 = yes

  int ndatumsend;            // # of datums to send w/ self
  int ndatumrecv;            // # of datums to recv w/ self
  int nbytesrecv;            // total bytes in received data w/ self
  int nsend;                 // # of messages to send w/out self
  int nrecv;                 // # of messages to recv w/out self
  int nsendmax;              // # of bytes in largest send message, w/out self

  int *sendproc;             // list of procs to send to w/out self
  int *sendcount;            // # of datums to send to each proc w/ self
  int *sendsize;             // # of bytes to send to each proc w/ self
  int *sendindices;          // indices of datums to send to each proc w/ self

  int nsize;                 // size of every datum in bytes (SAME)
  int *sendsizedatum;        // bytes in each datum to send w/ self (VARYING)
  int *sendoffset;           // byte offset to where each datum starts w/ self
  int sendoffsetflag;        // 1 if allocated sendoffset, 0 if passed in

  int *recvproc;             // list of procs to recv from w/out self
  int *recvcount;            // # of datums to recv from each proc w/out self
  int *recvsize;             // # of bytes to recv from each proc w/out self

  MPI_Request *request;      // MPI requests for posted recvs
  MPI_Status *status;        // MPI statuses for Waitall
  MPI_Comm comm;             // MPI communicator for all communication

  class Memory *memory;
  class Error *error;

  void exchange_same(char *, char *);
  void exchange_varying(char *, char *);
  void init();
  void deallocate();
};

#endif