/*D
   MPI_Graph_neighbors_count - Returns the number of neighbors of a node

Synopsis:
.vb
int MPI_Graph_neighbors_count(MPI_Comm comm, int rank, int *nneighbors)
.ve

Input Parameters:
+ comm - communicator with graph topology (handle)
- rank - rank of process in group of comm (integer)

Output Parameters:
. nneighbors - number of neighbors of specified process (integer)

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_COMM
.N MPI_ERR_RANK
.N MPI_ERR_OTHER

D*/

