howto use reify in defmacro
hi all, I want to use reify in macro, but the namespace is the problem. the following code shows what have done. is there a way to make it right? (defmacro def-site-entity [ent body] `(let [e# (create-e)] (def ~ent (reify clojure.lang.ILookup (valAt [key not-found] (condp = key :db @t1 :options @t2 (get e# key not-found))) Joe -- -- 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.
howto use reify in defmacro
hi all, I want to use reify in macro, but the namespace is the problem. the following code shows what have done. is there a way to make it right? (defmacro def-site-entity [ent body] `(let [e# (create-e)] (def ~ent (reify clojure.lang.ILookup (valAt [key not-found] (condp = key :db @t1 :options @t2 (get e# key not-found))) Joe -- -- 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.
Re: howto use reify in defmacro
Xiangtao Zhou tao...@gmail.com writes: Hi! I want to use reify in macro, but the namespace is the problem. the following code shows what have done. is there a way to make it right? Probably this will work: (defmacro def-site-entity [ent body] `(let [e# (create-e)] (def ~ent (reify ~'clojure.lang.ILookup (valAt [key# not-found#] (condp = key# :db (deref ~'t1) :options (deref ~'t2) (get e# key# not-found#))) Basically, every symbol that shouldn't be qualified but should appear as written in the macro definition has to be prefixed with ~'. I think you could also write ~'@t1 instead of the more verbose form (deref ~'t1) but I wasn't sure. 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.
Re: howto use reify in defmacro
as an aside, if you're writing def-like macros, I'd encourage you to look at 'clojure.tools.macro/name-with-attributes' Jim On 18/12/13 12:14, Tassilo Horn wrote: Xiangtao Zhou tao...@gmail.com writes: Hi! I want to use reify in macro, but the namespace is the problem. the following code shows what have done. is there a way to make it right? Probably this will work: (defmacro def-site-entity [ent body] `(let [e# (create-e)] (def ~ent (reify ~'clojure.lang.ILookup (valAt [key# not-found#] (condp = key# :db (deref ~'t1) :options (deref ~'t2) (get e# key# not-found#))) Basically, every symbol that shouldn't be qualified but should appear as written in the macro definition has to be prefixed with ~'. I think you could also write ~'@t1 instead of the more verbose form (deref ~'t1) but I wasn't sure. 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.
Re: howto use reify in defmacro
hi Tassilo, that's great, thanks. I current use a function wrap reify, it's simple. (defn make-reify [entity] ...) (defmacro def-site-entity `(let [e# (create-e)] (def ~ent (make-reify e# Joe On Wed, Dec 18, 2013 at 8:14 PM, Tassilo Horn t...@gnu.org wrote: Xiangtao Zhou tao...@gmail.com writes: Hi! I want to use reify in macro, but the namespace is the problem. the following code shows what have done. is there a way to make it right? Probably this will work: (defmacro def-site-entity [ent body] `(let [e# (create-e)] (def ~ent (reify ~'clojure.lang.ILookup (valAt [key# not-found#] (condp = key# :db (deref ~'t1) :options (deref ~'t2) (get e# key# not-found#))) Basically, every symbol that shouldn't be qualified but should appear as written in the macro definition has to be prefixed with ~'. I think you could also write ~'@t1 instead of the more verbose form (deref ~'t1) but I wasn't sure. Bye, Tassilo -- Zhou Xiangtao Email: tao...@gmail.com -- -- 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.
Re: howto use reify in defmacro
Joe (Zhou Xiangtao) tao...@gmail.com writes: that's great, thanks. I current use a function wrap reify, it's simple. (defn make-reify [entity] ...) (defmacro def-site-entity `(let [e# (create-e)] (def ~ent (make-reify e# That's even better. ;-) 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.
