But "reader macros" *are* expanded at read-time (as their name indicates, BTW) :
1:91 user=> (read-string "'quoted-symbol") (quote quoted-symbol) 1:92 user=> HTH, -- Laurent 2009/4/21 Laurent PETIT <laurent.pe...@gmail.com>: > 2009/4/21 Mark Volkmann <r.mark.volkm...@gmail.com>: >> >> I didn't explain my question well enough. Suppose I define a macro >> with defmacro and have several calls to it in my code. When are those >> calls expanded to the code inside the macro? Is that at read-time? > > Maybe the example I gave (by using the macro 'defn) was not as clear > as I intended. But really, defn is a regular macro created via > defmacro, so the point is proven here as with any user defined macro. > > HTH, > > -- > Laurent >> >> On Mon, Apr 20, 2009 at 5:34 PM, Laurent PETIT <laurent.pe...@gmail.com> >> wrote: >>> >>> Hello, >>> >>> Apparently, no: >>> >>> 1:85 user=> (macroexpand-1 '(defn hello [] "world")) >>> (def hello (clojure.core/fn ([] "world"))) >>> 1:86 user=> (read-string "(defn hello [] \"world\")") >>> (defn hello [] "world") >>> 1:87 user=> >>> >>> read-string did not expand defn. >>> >>> I think it's 'eval that expands macros and compiles forms. >>> >>> Regards, >>> >>> -- >>> Laurent >>> >>> 2009/4/21 Mark Volkmann <r.mark.volkm...@gmail.com>: >>>> >>>> In my Clojure article at http://ociweb.com/mark/clojure/article.html I say: >>>> >>>> "Clojure code is processed in three phases: read-time, compile-time >>>> and run-time. At read-time the Reader reads source code and converts >>>> it to a data structure, mostly a list of lists of lists .... At >>>> compile-time this data structure is converted to Java bytecode. At >>>> run-time the bytecode is executed. Functions are only invoked at >>>> run-time. Macros are special constructs that look similar to >>>> functions, but are expanded into new Clojure code at read-time." >>>> >>>> Is it correct to say that macros are expanded at read-time? >> >> -- >> R. Mark Volkmann >> Object Computing, Inc. >> >> >> >> > --~--~---------~--~----~------------~-------~--~----~ 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 clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
