Re: Weird GenSyms behaviour across different quoted blocks in a macro
Auto generated symbols (x# style) are only valid within a single syntax quote form. Instead declare the symbol ahead of time, something like this: (let [fsym (gensym "f_)] `(fn [~fsym] ~@(for [x (range 10] `(println ~fsym ~x Hope this helps. Timothy On Wed, Aug 26, 2015 at 3:07 PM, Rafik NACCACHE wrote: > Suppose I have the following macro, which generates a function that does > some repetitive generation, let's say: > > (defmacro a-macro > [m] > `(fn [f#] > ~(for [i# m] > `(* (:val f#) ~i# > > Note how I start with a quoted block in which I emit the fn header, and in > which I use a gensym to capture its input, F#. I unquote to do my iterative > processing, then I quote again to emit my macro output. > > If I macroexpand this: > (clojure.pprint/pprint (macroexpand '(a-macro (1 2 3 > > I get : > > (fn* > ([f__11552__auto__] > ((clojure.core/* (:val f__11551__auto__) 1) >(clojure.core/* (:val f__11551__auto__) 2) >(clojure.core/* (:val f__11551__auto__) 3 > > And I have a problem. The auto gensym for args declaration (...11522) is > different from the gensyms applying this arg in my generated function body > (...11551), so I cannot call my function. > > Any Idea why is that? And Can you please help me to sort this kind of > situation? > > Thank you; > > Rafik > > -- > 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/d/optout. > -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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/d/optout.
Re: Weird GenSyms behaviour across different quoted blocks in a macro
What Ambrose said and: There is no need to use a hash for i in the for form. It is misleading because one thinks it will become a generated symbol as part of the generated form which is untrue. On Wednesday, August 26, 2015 at 11:08:12 PM UTC+2, Rafik NACCACHE wrote: > > Suppose I have the following macro, which generates a function that does > some repetitive generation, let's say: > > (defmacro a-macro > [m] > `(fn [f#] > ~(for [i# m] > `(* (:val f#) ~i# > > Note how I start with a quoted block in which I emit the fn header, and in > which I use a gensym to capture its input, F#. I unquote to do my iterative > processing, then I quote again to emit my macro output. > > If I macroexpand this: > (clojure.pprint/pprint (macroexpand '(a-macro (1 2 3 > > I get : > > (fn* > ([f__11552__auto__] > ((clojure.core/* (:val f__11551__auto__) 1) >(clojure.core/* (:val f__11551__auto__) 2) >(clojure.core/* (:val f__11551__auto__) 3 > > And I have a problem. The auto gensym for args declaration (...11522) is > different from the gensyms applying this arg in my generated function body > (...11551), so I cannot call my function. > > Any Idea why is that? And Can you please help me to sort this kind of > situation? > > Thank you; > > Rafik > -- 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/d/optout.
Re: Weird GenSyms behaviour across different quoted blocks in a macro
unify-gensyms from potemkin will fix this: https://github.com/ztellman/potemkin On Wed, Aug 26, 2015 at 2:07 PM, Rafik NACCACHE wrote: > Suppose I have the following macro, which generates a function that does > some repetitive generation, let's say: > > (defmacro a-macro > [m] > `(fn [f#] > ~(for [i# m] > `(* (:val f#) ~i# > > Note how I start with a quoted block in which I emit the fn header, and in > which I use a gensym to capture its input, F#. I unquote to do my iterative > processing, then I quote again to emit my macro output. > > If I macroexpand this: > (clojure.pprint/pprint (macroexpand '(a-macro (1 2 3 > > I get : > > (fn* > ([f__11552__auto__] > ((clojure.core/* (:val f__11551__auto__) 1) >(clojure.core/* (:val f__11551__auto__) 2) >(clojure.core/* (:val f__11551__auto__) 3 > > And I have a problem. The auto gensym for args declaration (...11522) is > different from the gensyms applying this arg in my generated function body > (...11551), so I cannot call my function. > > Any Idea why is that? And Can you please help me to sort this kind of > situation? > > Thank you; > > Rafik > > -- > 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/d/optout. > -- Ben Wolfson "Human kind has used its intelligence to vary the flavour of drinks, which may be sweet, aromatic, fermented or spirit-based. ... Family and social life also offer numerous other occasions to consume drinks for pleasure." [Larousse, "Drink" entry] -- 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/d/optout.
Re: Weird GenSyms behaviour across different quoted blocks in a macro
You want an explicit gensym that scopes over both positions. (defmacro a-macro [m] (let [f (gensym "f)] `(fn [~f] ~(for [i# m] `(* (:val ~f) ~i# ) Thanks, Ambrose On Wed, Aug 26, 2015 at 5:07 PM, Rafik NACCACHE wrote: > Suppose I have the following macro, which generates a function that does > some repetitive generation, let's say: > > (defmacro a-macro > [m] > `(fn [f#] > ~(for [i# m] > `(* (:val f#) ~i# > > Note how I start with a quoted block in which I emit the fn header, and in > which I use a gensym to capture its input, F#. I unquote to do my iterative > processing, then I quote again to emit my macro output. > > If I macroexpand this: > (clojure.pprint/pprint (macroexpand '(a-macro (1 2 3 > > I get : > > (fn* > ([f__11552__auto__] > ((clojure.core/* (:val f__11551__auto__) 1) >(clojure.core/* (:val f__11551__auto__) 2) >(clojure.core/* (:val f__11551__auto__) 3 > > And I have a problem. The auto gensym for args declaration (...11522) is > different from the gensyms applying this arg in my generated function body > (...11551), so I cannot call my function. > > Any Idea why is that? And Can you please help me to sort this kind of > situation? > > Thank you; > > Rafik > > -- > 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/d/optout. > -- 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/d/optout.
Weird GenSyms behaviour across different quoted blocks in a macro
Suppose I have the following macro, which generates a function that does some repetitive generation, let's say: (defmacro a-macro [m] `(fn [f#] ~(for [i# m] `(* (:val f#) ~i# Note how I start with a quoted block in which I emit the fn header, and in which I use a gensym to capture its input, F#. I unquote to do my iterative processing, then I quote again to emit my macro output. If I macroexpand this: (clojure.pprint/pprint (macroexpand '(a-macro (1 2 3 I get : (fn* ([f__11552__auto__] ((clojure.core/* (:val f__11551__auto__) 1) (clojure.core/* (:val f__11551__auto__) 2) (clojure.core/* (:val f__11551__auto__) 3 And I have a problem. The auto gensym for args declaration (...11522) is different from the gensyms applying this arg in my generated function body (...11551), so I cannot call my function. Any Idea why is that? And Can you please help me to sort this kind of situation? Thank you; Rafik -- 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/d/optout.
