Hi Jose, The key determinant of metadata in Clojure is whether the data is orthogonal to equality. Would two tasks with identical behavior but different staleness predicates be equal? I would say no, hence a staleness predicate would be data, not metadata.
I'll be interested to hear what others think. Cheers, Stu > Hi, > > In order to learn and experiment with clojure, i'm implementing a (for > now, toy) build system. The idea is to replace makefiles or ant build > files or your-favourite-make-replacement files by specifications > written > in a clojure-based embedded DSL (same thing as, for example, Rake or > Scons). > > A central concept in such a system is, of course, a task, which has > associated some unsurprising bits of data: a build procedure, > dependencies, a staleness predicate... In other languages (i've coded > some prototypes in Scheme and Common Lisp in the past) you would > typically define some sort of structured type to hold this data (for > instance, i was using CLOS in CL). But i was thinking that, in > clojure, > it could make sense to put this information in (possibly tagged) > metadata, so that any clojure object can behave as a task. > > My gut feeling is that such design would buy me some flexibility, > avoiding the usual type system straitjacket; and, anyway, it seems > kinda > fun. But clojure is the first language i use providing metadata, and i > lack the experience to know whether i'm on sound ground here. > > So, my question: do you think that this would be a good, idiomatic use > of metadata? Is there any code or conceptual discussion on metadata > and > its uses? > > Thanks, > jao > -- > Always have a vision. Why spend your life making other people’s > dreams? > -Orson Welles (1915-1985) > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
