!
! Copyright (C) by Argonne National Laboratory
!     See COPYRIGHT in top-level directory
!

subroutine MPI_Graph_neighbors_count_f08(comm, rank, nneighbors, ierror)
    use, intrinsic :: iso_c_binding, only : c_int
    use :: mpi_f08, only : MPI_Comm
    use :: mpi_c_interface, only : c_Comm
    use :: mpi_c_interface, only : MPIR_Graph_neighbors_count_c

    implicit none

    type(MPI_Comm), intent(in) :: comm
    integer, intent(in) :: rank
    integer, intent(out) :: nneighbors
    integer, optional, intent(out) :: ierror

    integer(c_Comm) :: comm_c
    integer(c_int) :: rank_c
    integer(c_int) :: nneighbors_c
    integer(c_int) :: ierror_c

    if (c_int == kind(0)) then
        ierror_c = MPIR_Graph_neighbors_count_c(comm%MPI_VAL, rank, nneighbors)
    else
        comm_c = comm%MPI_VAL
        rank_c = rank
        ierror_c = MPIR_Graph_neighbors_count_c(comm_c, rank_c, nneighbors_c)
        nneighbors = nneighbors_c
    end if

    if (present(ierror)) ierror = ierror_c

end subroutine MPI_Graph_neighbors_count_f08
