/*D
   MPI_Info_get_nkeys - Returns the number of currently defined keys in info

Synopsis:
.vb
int MPI_Info_get_nkeys(MPI_Info info, int *nkeys)
.ve

Input Parameters:
. info - info object (handle)

Output Parameters:
. nkeys - number of defined keys (integer)

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_INFO
.N MPI_ERR_OTHER

D*/

