On Fri, Aug 29, 2008 at 07:40:03AM -0400, Kenny Tilton wrote: > Kenny Tilton wrote: > >Larry Clapp wrote: > > > > > I understand (I think ...) what :once-asked *does*, I want to > > > know what it *means*. > > > > > > In other words, the other two options seem to answer the > > > question "when is this cell lazy?" Well, an :always cell is > > > always lazy -- it's not recalculated until and unless you ask > > > for it. An :until-asked cell is lazy until you query it once, > > > then it's non-lazy from then on. > > > > > > "once-asked" seems to answer a *different* question, "when is > > > this cell evaluated?" It's evaluated once, when created, and > > > then only when queried. > > > > > > Is there any single "question" that all three answer, or are > > > they just inconsistent? > > > > > > Once-asked would be "un-lazy until you query it once" (ie, > > consistent) but it also looks to be vestigial: all code seems to > > treat it the same as always. > > > > If I missed it in my brief scan of the code, it would have to do > > with model instance initialization. > > Yeah, looks like I missed it, because the code looks for other than > :once-asked to break off initialization and I was just searching on > once-asked.
Ah, so they all *do* answer the same question, "when is this cell lazy?", but with the clarification that creation => asking. once-asked: Lazy once you ask for it (creating asks) until-asked: Lazy until you ask for it (creating does not ask) always: Lazy always (creating does not ask) This is probably one of those things that would have become clear once I got more experience with Cells, but I'm lazy, so I asked. :) Thanks for the quick answer! -- L _______________________________________________ cells-devel site list cells-devel@common-lisp.net http://common-lisp.net/mailman/listinfo/cells-devel
