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_valuelen