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MPI_Info_get_nkeys(3OpenMPI)                                                    MPI_Info_get_nkeys(3OpenMPI)



NAME
       MPI_Info_get_nkeys - Gets the number of keys currently defined in an info object.


SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Info_get_nkeys(MPI_Info info, int *nkeys)


Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_INFO_GET_NKEYS(INFO, NKEYS, IERROR)
            INTEGER        INFO, NKEYS, IERROR


C++ Syntax
       #include <mpi.h>
       int MPI::Info::Get_nkeys() const


INPUT PARAMETER
       info      Info object (handle).


OUTPUT PARAMETERS
       nkeys     Number of defined keys (integer).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPI_Info_get_nkeys returns the number of currently defined keys in info.


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_nthkey
       MPI_Info_get_valueln




Open MPI 1.2                                   September 2006                   MPI_Info_get_nkeys(3OpenMPI)