On Tue, Apr 30, 2013 at 11:00 AM, Tassilo Horn <t...@gnu.org> wrote: > Gary Trakhman <gary.trakh...@gmail.com> writes: > > > If you're passing the var itself, I don't see why you'd need a macro. > > If you want to check the namespace for a var matching an unquoted > > symbol, you could do that in a macro. > > In case you really don't have the var itself but just its value, then > "unbound" is a value, too, and you could check for it using > > (instance? clojure.lang.Var$Unbound *x*) > ;=> true > > nice one, thanks!
I was thinking just in case any of these "clojure.lang.Var$Unbound" change in the future, maybe I'd do something like this: =>* (def uniqsym (gensym))* #'jme3test1.x1/uniqsym => *uniqsym* G__1603 =>* (defmacro defus [] `(def ~uniqsym))* #'jme3test1.x1/defus => *(defus)* #'jme3test1.x1/G__1603 => *(class (eval uniqsym))* clojure.lang.Var$Unbound => *(def unbound-class (class (eval uniqsym)))* #'jme3test1.x1/unbound-class =>* unbound-class* clojure.lang.Var$Unbound => *(def ^:dynamic *x*)* #'jme3test1.x1/*x* =>* (instance? unbound-class *x*)* true =>* (binding [*x* 1] (instance? unbound-class *x*) )* false =>* (def ^:dynamic *x* 2)* #'jme3test1.x1/*x* =>* (binding [*x* 1] (instance? unbound-class *x*) )* false instead of > > (not (bound? #'*x*)) > > Bye, > Tassilo > > -- > -- > 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 > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- 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 Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.