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

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_INFO_GET_NTHKEY(INFO, N, KEY, IERROR)
            INTEGER        INFO, N, IERROR
            CHARACTER*(*)  KEY

Fortran 2008 Syntax

       USE mpi_f08
       MPI_Info_get_nthkey(info, n, key, ierror)
            TYPE(MPI_Info), INTENT(IN) :: info
            INTEGER, INTENT(IN) :: n
            CHARACTER(LEN=*), INTENT(OUT) :: key
            INTEGER, OPTIONAL, INTENT(OUT) :: ierror

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

4.0.3                                             Mar 03, 2020                            MPI_Info_get_nthkey(3)