Re: Project - Eliminating grob parents and outside-staff-priority

[David Kastrup]

Han-Wen Nienhuys <address@hidden> writes:

> In order to do cache invalidation, you will have to construct the
> reverse graph. If A.x depends on B.y, now A points to B. For proper
> cache invalidation, if B.y changes, then A.x becomes invalid. This
> means that A has to store a back-reference to B. Hence all pointers
> have to be stored both ways (including inverting 1-N relations into
> N-1 relations), and the both-way links have to be rewritten correctly
> during line breaking.

You can assign a generational count to properties.  If the generational
count of any dependency is higher than that of the dependent property,
it needs to get regenerated.  As long as the dependencies don't get lost
(and we use arbitrary size integers, resetting for each session), this
should be pretty straightforward and not require backwards links.  It
"just" requires double-checking your dependencies for change.

-- 
David Kastrup