sure it can, you just need to pass in an initial value. (-> (String.) String. String.) ; works (-> x String. String.) ;works for any x where string has a constructor that takes something of type x
for example (-> "file.txt" File. FileReader. BufferedReader.) will return a buffered reader on file.txt (assuming you import those classes from java.io) On Mon, Jun 8, 2009 at 12:59 PM, ronen<nark...@gmail.com> wrote: > > I see, using "->" with "." will not create a chain of "new" > invocations, the best solution that iv found is: > user=> (String. (String.)) > "" > user=> (macroexpand (String. (String.))) > "" > user=> (macroexpand `(String. (String.))) > (new java.lang.String (java.lang.String.)) > > Nesting is a must :) > Thank you both for your helpful reply > > On Jun 8, 10:51 pm, Kevin Downey <redc...@gmail.com> wrote: >> you need to pass something in. >> example: >> >> => (-> "foo" String. String.) >> "foo" >> >> => (macroexpand '(-> String. String.)) >> (new String String.) >> >> => (macroexpand '(-> "foo" String. String.)) >> (new String (clojure.core/-> "foo" String.)) >> => (macroexpand '(-> "foo" String.)) >> (new String "foo") >> >> String. is only treated as new String ... when it is placed in the >> function position (String. ...) >> in (-> String. String.) the first String. is never put in the >> function position, so effectively you get >> (String. String.) >> >> >> >> On Mon, Jun 8, 2009 at 12:38 PM, ronen<nark...@gmail.com> wrote: >> >> > Following a blog post on building large object graphs I was suggested >> > with the following solution: >> > (def nested-object (-> GrandFather. Father. GrandSon.)) >> >> > this indeed seems to be correct however fails in even in a simple >> > example: >> >> > user=> (-> String. String.) >> > java.lang.ClassNotFoundException: String. (NO_SOURCE_FILE:7) >> >> > expanding the macros involved seems to reveal the issue: >> >> > user=> (macroexpand-1 `(-> String. String.)) >> > (java.lang.String. java.lang.String.) >> >> > the "." macro isn't expanded. >> >> > Is there a way of applying nested macros? >> > (iv searched for "applying nested macros" with no results). >> >> -- >> And what is good, Phaedrus, >> And what is not good— >> Need we ask anyone to tell us these things? > > > -- And what is good, Phaedrus, And what is not good— Need we ask anyone to tell us these things? --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
