| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| class(linked_node), | intent(inout) | :: | this | |||
| logical, | intent(in), | optional | :: | deallocate_old | Whether to deallocate (rather than just nullify) any existing
subsequent nodes in the chain. Defaults to |
Unsets the pointer to the next node in the chain, severing it.
By default, the pointer is only nullified. This may result in a
memory leak. Optionally, by setting deallocate_old=.true., the
next node (and all nodes it points to) can be deallocated. This
may result in a segfault if another part of the program tries to
access the former next node.
subroutine unset_next(this, deallocate_old)
!* Author: Chris MacMackin
! Date: February 2016
!
! Unsets the pointer to the next node in the chain, severing it.
! By default, the pointer is only nullified. This may result in a
! memory leak. Optionally, by setting `deallocate_old=.true.`, the
! next node (and all nodes it points to) can be deallocated. This
! may result in a segfault if another part of the program tries to
! access the former next node.
!
class(linked_node), intent(inout) :: this
logical, optional, intent(in) :: deallocate_old
!! Whether to deallocate (rather than just nullify) any existing
!! subsequent nodes in the chain. Defaults to `.false.`.
if (.not. this%has_next()) return
if (present(deallocate_old)) then
if (deallocate_old) then
call this%next%unset_next(.true.)
deallocate(this%next)
return
end if
end if
nullify(this%next)
end subroutine unset_next