On Tue, May 26, 2009 at 8:05 PM, John M. Dlugosz <2nb81l...@sneakemail.com> wrote: > Jon Lang dataweaver-at-gmail.com |Perl 6| wrote: >> >> >From S09, under Junctions: >> >> "The exact semantics of autothreading with respect to control >> structures are subject to change over time; it is therefore erroneous >> to pass junctions to any control construct that is not implemented via >> as a normal single or multi dispatch. In particular, threading >> junctions through conditionals correctly could involve continuations, >> which are almost but not quite mandated in Perl 6.0.0." >> >> What is a continuation? >> >> > > <http://en.wikipedia.org/wiki/Continuation> > > Early on, Perl 6 discussion featured a lot on Continuations. Now, I don't > see it anywhere at all, and believe that the general form is not required, > by design. That is, "not mandated". It's a computer science concept that > generalizes *all* forms of flow control including exceptions, co-routines, > etc. The long-jump or exception is a more normal case of returning to > something that is still in context, but imagine if you could go both ways: > bookmark something in the code, like making a closure but for the complete > calling stack of activation complexes, and then jump back to it later. >
OK; that's about as clear as mud. But I think I've got a rough idea about what you're talking about. Next question: what does that have to do with junctions? -- Jonathan "Dataweaver" Lang
