ESMF_CompIsDualConnected Function

  recursive function ESMF_CompIsDualConnected(compp, rc)
!
! !RETURN VALUE:
    logical :: ESMF_CompIsDualConnected
!
! !ARGUMENTS:
    type(ESMF_CompClass), pointer               :: compp
    integer,              intent(out), optional :: rc             

!
! !DESCRIPTION:
!  Inquire if this component is a connected dual component.
!
!  The return value is {\tt .true.} if the component is a connected dual
!  component, {\tt .false.} otherwise.
!
!EOPI
!------------------------------------------------------------------------------
    integer                 :: localrc      ! local return code
    type(ESMF_Status)       :: baseStatus

    ! Initialize return code; assume not implemented until success is certain
    localrc = ESMF_RC_NOT_IMPL
    if (present(rc)) rc = ESMF_RC_NOT_IMPL
        
    ! Initialize output in case of error
    ESMF_CompIsDualConnected = .false.

    ! Test incoming compp object
    if (.not.associated(compp)) then
      call ESMF_LogSetError(ESMF_RC_OBJ_BAD, &
        msg="Not a valid pointer to ESMF Component object", &
        ESMF_CONTEXT, rcToReturn=rc)
      return
    endif

    ! Check init status of arguments
    ESMF_INIT_CHECK_DEEP(ESMF_CompClassGetInit, compp, rc)

    call ESMF_BaseGetStatus(compp%base, baseStatus, rc=localrc)
    if (ESMF_LogFoundError(localrc, &
        ESMF_ERR_PASSTHRU, &
        ESMF_CONTEXT, rcToReturn=rc)) return
        
    if (baseStatus /= ESMF_STATUS_READY) then
      call ESMF_LogSetError(ESMF_RC_OBJ_BAD, &
        msg="uninitialized or destroyed Component object", &
        ESMF_CONTEXT, rcToReturn=rc)
      return
    endif
    
    ESMF_CompIsDualConnected = (compp%compTunnel%this /= ESMF_NULL_POINTER)
 
    ! Return successfully
    if (present(rc)) rc = ESMF_SUCCESS

  end function ESMF_CompIsDualConnected