ESMF_VMEQ Function

  impure elemental function ESMF_VMEQ(vm1, vm2)
! 
! !RETURN VALUE:
    logical :: ESMF_VMEQ

! !ARGUMENTS:
    type(ESMF_VM), intent(in) :: vm1
    type(ESMF_VM), intent(in) :: vm2

! !DESCRIPTION:
!   Test if both {\tt vm1} and {\tt vm2} alias the same ESMF VM 
!   object.
!
!EOPI
!-------------------------------------------------------------------------------

    ESMF_INIT_TYPE init1, init2
    integer :: localrc1, localrc2
    logical :: lval1, lval2

    ! Use the following logic, rather than "ESMF-INIT-CHECK-DEEP", to gain 
    ! init checks on both args, and in the case where both are uninitialized,
    ! to distinguish equality based on uninitialized type (uncreated,
    ! deleted).

    ! TODO: Consider moving this logic to C++: using Base class? status?
    !       Or replicate logic for C interface also.

    ! check inputs
    init1 = ESMF_VMGetInit(vm1)
    init2 = ESMF_VMGetInit(vm2)

    ! TODO: this line must remain split in two for SunOS f90 8.3 127000-03
    if (init1 .eq. ESMF_INIT_CREATED .and. &
      init2 .eq. ESMF_INIT_CREATED) then
      ESMF_VMEQ = vm1%this == vm2%this
    else
      ESMF_VMEQ = ESMF_FALSE
    endif

  end function ESMF_VMEQ