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.. _mpi_info_get_nthkey:
MPI_Info_get_nthkey
===================
.. include_body
:ref:`MPI_Info_get_nthkey` |mdash| Returns the *n*\ th defined key in *info*.
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_Info_get_nthkey(MPI_Info info, int n, char *key)
Fortran Syntax
^^^^^^^^^^^^^^
.. code-block:: fortran
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_INFO_GET_NTHKEY(INFO, N, KEY, IERROR)
INTEGER INFO, N, IERROR
CHARACTER*(*) KEY
Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^
.. code-block:: fortran
USE mpi_f08
MPI_Info_get_nthkey(info, n, key, ierror)
TYPE(MPI_Info), INTENT(IN) :: info
INTEGER, INTENT(IN) :: n
CHARACTER(LEN=*), INTENT(OUT) :: key
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
INPUT PARAMETERS
----------------
* ``info``: Info object (handle).
* ``n``: Key number (integer).
OUTPUT PARAMETERS
-----------------
* ``key``: Key (string).
* ``ierror``: Fortran only: Error status (integer).
DESCRIPTION
-----------
:ref:`MPI_Info_get_nthkey` returns the *n*\ th defined key in *info*. Keys are
numbered 0...\ *N* - 1 where *N* is the value returned by
:ref:`MPI_Info_get_nkeys`. All keys between 0 and *N* - 1 are guaranteed to be
defined. The number of a given key does not change as long as *info* is
not modified with :ref:`MPI_Info_set` or :ref:`MPI_Info_delete`.
ERRORS
------
.. include:: ./ERRORS.rst
.. seealso::
* :ref:`MPI_Info_get`
* :ref:`MPI_Info_get_nkeys`
* :ref:`MPI_Info_get_valuelen`
|
