MPI_Info_get_nthkey(3OpenMPI)											     MPI_Info_get_nthkey(3OpenMPI)

NAME

       MPI_Info_get_nthkey - Returns the nth defined key in info.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Info_get_nthkey(MPI_Info info, int n, char *key)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_INFO_GET_NTHKEY(INFO, N, KEY, IERROR)
	    INTEGER	   INFO, N, IERROR
	    CHARACTER*(*)  KEY

C++ Syntax
       #include <mpi.h>
       void MPI::Info::Get_nthkey(int n, char* key) const

INPUT PARAMETERS

       info	 Info object (handle).

       n	 Key number (integer).

OUTPUT PARAMETERS

       key	 Key (string).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       MPI_Info_get_nthkey  returns  the nth defined key in info. Keys are numbered 0...N - 1 where N is the value returned by 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
       MPI_Info_set or MPI_Info_delete.

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++ func-
       tions 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 ALSO

       MPI_Info_get
       MPI_Info_get_nkeys
       MPI_Info_get_valueln

Open MPI 1.2							  September 2006				     MPI_Info_get_nthkey(3OpenMPI)