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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++
       functions  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



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