:ref:`MPI_Type_extent` |mdash| Returns the extent of a data type |mdash| |deprecated_favor| :ref:`MPI_Type_get_extent`.
#include <mpi.h>
int MPI_Type_extent(MPI_Datatype datatype, MPI_Aint *extent)
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_TYPE_EXTENT(DATATYPE, EXTENT, IERROR)
INTEGER DATATYPE, EXTENT, IERROR
datatype
: Datatype (handle).
extent
: Datatype extent (integer).ierror
: Fortran only: Error status (integer).
Note that use of this routine is deprecated as of MPI-2. Please use :ref:`MPI_Type_get_extent` instead.
:ref:`MPI_Type_extent` returns the extent of a data type, the difference between the upper and lower bounds of the data type.
In general, if
Typemap = {(type(0), disp(0)), ..., (type(n-1), disp(n-1))}
then the lower bound of Typemap is defined to be
( min(j) disp(j) if no entry has
lb(Typemap)=( basic type lb
(min(j) {disp(j) such that type(j) = lb} otherwise
Similarly, the upper bound of Typemap is defined to be
(max(j) disp(j) + sizeof(type(j)) + e if no entry has
ub(Typemap)=( basic type ub
(max(j) {disp(j) such that type(j) = ub} otherwise
Then
extent(Typemap) = ub(Typemap) - lb(Typemap)
If type(i) requires alignment to a byte address that is a multiple of k(i), then e is the least nonnegative increment needed to round extent(Typemap) to the next multiple of max(i) k(i).
.. seealso::
* :ref:`MPI_Type_get_extent`