NAME

       MPI_Type_get_extent, MPI_Type_get_extent_x - Returns the lower bound and extent of a data type.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Type_get_extent(MPI_Datatype datatype, MPI_Aint *lb,
            MPI_Aint *extent)
       int MPI_Type_get_extent_x(MPI_Datatype datatype, MPI_Count *lb,
            MPI_Count *extent)

Fortran Syntax (see FORTRAN 77 NOTES)

       INCLUDE 'mpif.h'
       MPI_TYPE_GET_EXTENT(DATATYPE, LB, EXTENT, IERROR)
            INTEGER   DATATYPE, IERROR
            INTEGER(KIND=MPI_ADDRESS_KIND) LB, EXTENT
       MPI_TYPE_GET_EXTENT_X(DATATYPE, LB, EXTENT, IERROR)
            INTEGER   DATATYPE, IERROR
            INTEGER(KIND=MPI_COUNT_KIND) LB, EXTENT

C++ Syntax

       #include <mpi.h>
       void MPI::Datatype::Get_extent(MPI::Aint& lb, MPI::Aint& extent)
            const

INPUT PARAMETER

       datatype  Data type (handle).

OUTPUT PARAMETERS

       lb        Lower bound of data type (integer).

       extent    Data type extent (integer).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_Type_get_extent  returns  the  lower bound and the extent of datatype. For either function, if either
       the lb or extent parameter cannot express the value to be returned (e.g., if the parameter is  too  small
       to hold the output value), it is set to MPI_UNDEFINED.

NOTE

       Use  of  MPI_Type_get_extent  is  strongly  recommended  over the old MPI-1 functions MPI_Type_extent and
       MPI_Type_lb.

FORTRAN 77 NOTES

       The MPI standard prescribes portable Fortran syntax for the LB and EXTENT arguments only for Fortran  90.
       FORTRAN 77 users may use the non-portable syntax

       MPI_Type_get_extent:

            INTEGER*MPI_ADDRESS_KIND LB
       or
            INTEGER*MPI_ADDRESS_KIND EXTENT

       MPI_Type_get_extent_x:

            INTEGER*MPI_COUNT_KIND LB
       or
            INTEGER*MPI_COUNT_KIND EXTENT

       where  MPI_ADDRESS_KIND  and  MPI_COUNT_KIND  are  constants defined in mpif.h and give the length of the
       declared integer in bytes.

ERRORS

       Almost all MPI routines return an error value; C routines as  the  value  of  the  function  and  Fortran
       routines in the last argument. C++ functions do not return errors. If the default error handler is set to
       MPI::ERRORS_THROW_EXCEPTIONS, then on error the  C++  exception  mechanism  will  be  used  to  throw  an
       MPI::Exception object.

       Before  the  error  value  is  returned,  the current MPI error handler is called. By default, this error
       handler aborts the MPI job, except for I/O function  errors.  The  error  handler  may  be  changed  with
       MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values
       to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.