# MPI_Type_create_hindexed

## NAME

MPI_Type_create_hindexed − Creates an indexed data type with offsets in bytes.

## SYNTAX

## C Syntax

#include <mpi.h>
int MPI_Type_create_hindexed(int count, int array_of_blocklengths[],

|  | MPI_Aint array_of_displacements[], MPI_Datatype oldtype,
|  | MPI_Datatype *newtype)

## Fortran Syntax (see FORTRAN 77 NOTES)

INCLUDE ’mpif.h’
MPI_TYPE_CREATE_HINDEXED(COUNT, ARRAY_OF_BLOCKLENGTHS,

| ARRAY_OF_DISPLACEMENTS, OLDTYPE, NEWTYPE, IERROR) |  |  |
| INTEGER |  |  | COUNT, ARRAY_OF_BLOCKLENGTHS(*), OLDTYPE, NEWTYPE, IERROR
| INTEGER(KIND=MPI_ADDRESS_KIND) ARRAY_OF_DISPLACEMENTS(*) |  |  |

## C++ Syntax

#include <mpi.h>
MPI::Datatype MPI::Datatype::Create_hindexed(int count,

| const int array_of_blocklengths[],
| const MPI::Aint array_of_displacements[]) const

## INPUT PARAMETERS

| count |  | Number of blocks (nonnegative integer). |

array_of_blocklengths

Number of elements in each block (array of nonnegative integers).

array_of_displacements

Byte displacement of each block (array of integers).

| oldtype |  | Old data type (handle). |

## OUTPUT PARAMETERS

| newtype |  | New data type (handle). |
| IERROR |  | Fortran only: Error status (integer). |

## DESCRIPTION

MPI_Type_create_hindexed is identical to MPI_Type_indexed, except that block displacements in array_of_displacements are specified in bytes, rather than in multiples of the oldtype extent.

Assume that oldtype has type map

{(type(0), disp(0)), ..., (type(n-1), disp(n-1))},

with extent ex. Let B be the array_of_blocklengths argument and D be the array_of_displacements argument. The newly created data type has
n x S^count-1
(i=0) B[i] entries:

{(type(0), disp(0) + D[0]),...,(type(n-1), disp(n-1) + D[0]),...,
(type(0), disp(0) + (D[0] + B[0]-1)* ex),...,
type(n-1), disp(n-1) + (D[0]+ B[0]-1)* ex),...,
(type(0), disp(0) + D[count-1]),...,(type(n-1), disp(n-1) + D[count-1]),...,
(type(0), disp(0) + D[count-1] + (B[count-1] -1)* ex),...,
(type(n-1), disp(n-1) + D[count-1] + (B[count-1] -1)* ex)}

NOTE − This routine replaces MPI_Type_hindexed, which is deprecated. See the man page MPI_Type_hindexed(3) for information about that routine.

## FORTRAN 77 NOTES

The MPI standard prescribes portable Fortran syntax for the ARRAY_OF_DISPLACEMENTS(*) argument only for Fortran 90. FORTRAN 77 users may use the non-portable syntax

INTEGER*MPI_ADDRESS_KIND ARRAY_OF_DISPLACEMENTS(*)

where MPI_ADDRESS_KIND is a constant defined in mpif.h and gives 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.

See the MPI(3) man page for a full list of MPI error codes.

## SEE ALSO

MPI_Type_indexed
MPI_Type_hindexed

MPI API Index