I feel they could add a flag to indicate if it was obtained via gensym or not.. I would have liked to have it in the past. It can help in writing debug macros .. may be give better debug messages etc. Sunil
On Sat, Dec 4, 2010 at 9:29 AM, Alex Osborne <a...@meshy.org> wrote: > Sunil S Nandihalli <sunil.nandiha...@gmail.com> writes: > > > I really like the &env. It has saved a lot of tedious work a couple of > > times .. but I have only found use for the keys of the map that gets > > passed like in the following example. > > > I don't understand what the val part of the map contains? I have > > failed at attempts to figuring it out.. Can somebody tell me what the > > val part contains and how one could use it? > > It contains a LocalBindings object which the compiler uses internally to > keep track of a local binding. Note that unlike the keys, the values of > &env are not a stable API, they're implementation details and may well > change. When he added &env I think Rich said he'd look at giving the > values of &env a proper API as part of the future Clojure in Clojure > compiler. > > But you can poke at them like this: > > (defmacro foo [] > (def lb (first (vals &env)))) > > (let [a (+ 1 3)] > (foo)) > > (.sym lb) > ;; a > > (.idx lb) > ;; 1 > > (.name lb) > ;; "a" > > (.isArg lb) > ;; false > > (.canBeCleared lb) > ;; true > > (.init lb) > ;; #<StaticMethodExpr > ;; clojure.lang.compiler$staticmethode...@1a9d267d> > > (.args (.init lb)) > ;; [#<ConstantExpr clojure.lang.compiler$constante...@51d2bb9f> > ;; #<ConstantExpr clojure.lang.compiler$constante...@621bedb0>] > > > If you're using Emacs + SLIME, the SLIME inspector is quite useful for > exploring unknown values. After evaling the first two forms above, put > the cursor over "lb" and press C-c I (note that's shift + i). You'll > get something like this: > > clojure.lang.compiler$localbind...@25de152f > -------------------- > Type: class clojure.lang.Compiler$LocalBinding > Value: clojure.lang.compiler$localbind...@25de152f > --- > Fields: > sym: a > tag: > init: clojure.lang.compiler$staticmethode...@1a9d267d > idx: 1 > name: a > isArg: false > clearPathRoot: clojure.lang.compiler$pathn...@1740d415 > canBeCleared: true > > You can then press enter on any of the field values or class names to > get more detail about them. > > -- > 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<clojure%2bunsubscr...@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 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
