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       MPI_Get_address -  Get the address of a location in memory


       int MPI_Get_address(const void *location, MPI_Aint * address)


              - location in caller memory (choice)


              - address of location (address integer)


       This  routine  is  provided  for both the Fortran and C programmers.  On many systems, the
       address returned by this routine will be the same as produced by the  C  &  operator,  but
       this  is  not  required  in  C and may not be true of systems with word- rather than byte-
       oriented instructions or systems with segmented address spaces.

       This routine should be used instead of MPI_Address .


       This routine is both thread- and interrupt-safe.  This means that this routine may  safely
       be used by multiple threads and from within a signal handler.


       All  MPI  routines  in  Fortran  (except  for MPI_WTIME and MPI_WTICK ) have an additional
       argument ierr at the end of the argument list.  ierr  is  an  integer  and  has  the  same
       meaning  as  the  return  value  of  the  routine  in  C.   In  Fortran,  MPI routines are
       subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.

       In Fortran, the integer type is always signed.  This can cause problems on  systems  where
       the  address  fits  into  a  four  byte  unsigned integer but the value is larger than the
       largest signed integer.  For example, a system with more than 2 GBytes of memory may  have
       addresses  that  do not fit within a four byte signed integer.  Unfortunately, there is no
       easy solution to this problem, as there is no Fortran  datatype  that  can  be  used  here
       (using  a  longer integer type will cause other problems, as well as surprising users when
       the size of the integer type is larger that the size of a pointer in C).  In this case, it
       is recommended that you use C to manipulate addresses.


       All  MPI  routines  (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as
       the value of the function and Fortran routines in the last argument.  Before the value  is
       returned,  the current MPI error handler is called.  By default, this error handler aborts
       the MPI  job.   The  error  handler  may  be  changed  with  MPI_Comm_set_errhandler  (for
       communicators),  MPI_File_set_errhandler  (for files), and MPI_Win_set_errhandler (for RMA
       windows).  The MPI-1 routine MPI_Errhandler_set may be used but  its  use  is  deprecated.
       The  predefined  error  handler  MPI_ERRORS_RETURN may be used to cause error values to be
       returned.  Note that MPI does not guarentee that an  MPI  program  can  continue  past  an
       error; however, MPI implementations will attempt to continue whenever possible.

              - No error; MPI routine completed successfully.
              - Other error; use MPI_Error_string to get more information about this error code.

                                            11/21/2018                         MPI_Get_address(3)