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.. _mpi_info_get_nkeys:
MPI_Info_get_nkeys
==================
.. include_body
:ref:`MPI_Info_get_nkeys` |mdash| Gets the number of keys currently defined in an
info object.
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_Info_get_nkeys(MPI_Info info, int *nkeys)
Fortran Syntax
^^^^^^^^^^^^^^
.. code-block:: fortran
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_INFO_GET_NKEYS(INFO, NKEYS, IERROR)
INTEGER INFO, NKEYS, IERROR
Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^
.. code-block:: fortran
USE mpi_f08
MPI_Info_get_nkeys(info, nkeys, ierror)
TYPE(MPI_Info), INTENT(IN) :: info
INTEGER, INTENT(OUT) :: nkeys
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
INPUT PARAMETER
---------------
* ``info``: Info object (handle).
OUTPUT PARAMETERS
-----------------
* ``nkeys``: Number of defined keys (integer).
* ``ierror``: Fortran only: Error status (integer).
DESCRIPTION
-----------
:ref:`MPI_Info_get_nkeys` returns the number of currently defined keys in
*info*.
ERRORS
------
.. include:: ./ERRORS.rst
.. seealso::
* :ref:`MPI_Info_get`
* :ref:`MPI_Info_get_nthkey`
* :ref:`MPI_Info_get_valuelen`
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