SYNTAX
------

C Syntax
^^^^^^^^

.. code-block:: c

    int MPI_Op_create(MPI_User_function* user_fn, int commute, MPI_Op*
        op)

    int MPI_Op_create_c(MPI_User_function_c* user_fn, int commute,
        MPI_Op* op)

Fortran Syntax
^^^^^^^^^^^^^^

.. code-block:: fortran

    USE MPI
    ! or the older form: INCLUDE 'mpif.h'
    MPI_OP_CREATE(USER_FN, COMMUTE, OP, IERROR)
    	EXTERNAL USER_FN
    	LOGICAL COMMUTE
    	INTEGER OP, IERROR

Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^

.. code-block:: fortran

    USE mpi_f08
    MPI_Op_create(user_fn, commute, op, ierror)
    	PROCEDURE(MPI_User_function) :: user_fn
    	LOGICAL, INTENT(IN) :: commute
    	TYPE(MPI_Op), INTENT(OUT) :: op
    	INTEGER, OPTIONAL, INTENT(OUT) :: ierror

    MPI_Op_create_c(user_fn, commute, op, ierror)
    	PROCEDURE(MPI_User_function_c) :: user_fn
    	LOGICAL, INTENT(IN) :: commute
    	TYPE(MPI_Op), INTENT(OUT) :: op
    	INTEGER, OPTIONAL, INTENT(OUT) :: ierror
