many2many.h
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	#ifndef MANY2MANY_H
	#define MANY2MANY_H

	#include "mpi.h"

	class Many2Many {
	public:
	Many2Many(MPI_Comm);
	~Many2Many();

	void setup(int, int , int, int );
	void exchange(int , int );
	void exchange(double , double );

	protected:
	int me,nprocs;
	MPI_Comm comm;
	class Memory *memory;
	class Error *error;

	int nown; // # of IDs common to src and dest
	int nsrc_off,ndest_off; // # of off-processor IDs

	int src_own,dest_own; // indices of the owned IDs
	int src_off,dest_off; // indices of the off-proc IDs

	int src_iwork,dest_iwork; // work arrays for comm of ints
	double src_dwork,dest_dwork; // work arrays for comm of doubles

	class Irregular *irregular; // irregular comm from src->dest

	struct Datum1 {
	int id; // src or dest global ID
	int proc; // owning proc
	int index; // local index on owning proc
	};

	struct Datum2 {
	int slocal; // local index of src ID on sending proc
	int dlocal; // local index of dest ID on receiving proc
	int dproc; // receiving proc
	};

	void deallocate();
	};

	#endif