MODULE layout_mod
  USE genmod
  IMPLICIT NONE

  INTEGER,PARAMETER :: field_T=1
  INTEGER,PARAMETER :: field_U=2
  INTEGER,PARAMETER :: field_Z=3
  INTEGER,PARAMETER :: field_type_max=3

  TYPE t_layout
     LOGICAL :: oriented ! .TRUE. if sign may need to change when exchanging halos
     INTEGER :: ij_size    ! needed for allocation
  END type t_layout

  ! allocated and filled during model startup  
  TYPE(t_layout), ALLOCATABLE :: layout(:,:), &  ! used by allocated_field
       &                         layout_glo(:,:) ! used by allocated_field_glo
  
CONTAINS

END MODULE layout_mod