Re: is this macro right?
Sorry, because i ask the first question which i can't find it.I'm sorry for that. On Tuesday, December 29, 2015 at 4:50:57 AM UTC+8, Leif wrote: > > I tried to answer this on your other thread. If it was unclear, please > tell me (on that thread) what points need to be clarified, and I'll try my > best. I am unsure why you started a new thread asking the same question, > with even less context. > > --Leif > > On Monday, December 28, 2015 at 3:47:39 AM UTC-5, Mian Pao wrote: >> >> >> http://stackoverflow.com/questions/34448773/is-function-print-has-bug-in-clojure >> > -- 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.
is this macro right?
http://stackoverflow.com/questions/34448773/is-function-print-has-bug-in-clojure -- 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: is it function print has bug？
Thanks for answer my question.
On Saturday, December 26, 2015 at 10:59:51 PM UTC+8, Leif wrote:
>
> Hi, Mian Pao.
>
> When you call the macro te, a is bound to the *symbol* 'print, not the
> *function* print. So, what the ~(a b c) form is doing is calling the
> symbol 'print as a function:
> ('print 1 '(2 3)) => '(2 3)
>
> This is because symbols and keywords implement the function interface, and
> the call above is equivalent to
> (get 1 'print '(2 3)) => '(2 3) ; Tries to look up 'print in the data
> structure 1, fails, uses default value '(2 3).
>
> Hope that helps,
> Leif
>
> On Thursday, December 24, 2015 at 8:38:44 AM UTC-5, Mian Pao wrote:
>>
>> I just write a macro
>>
>> ```
>> (defmacro te
>> [a b & c]
>> `(print
>> ~(a b c)))
>> ```
>>
>> and i run
>>
>> ```
>> (macroexpand '(te print 2 3 4))
>> ;=> (clojure.core/print (3 4))
>> ```
>>
>> it get `(clojure.core/print (3 4))` not `(clojure.core/print nil)`
>>
>> iti is mean `(print 2 '(3 4))` return (3 4)?
>>
>
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is it function print has bug？
I just write a macro ``` (defmacro te [a b & c] `(print ~(a b c))) ``` and i run ``` (macroexpand '(te print 2 3 4)) ;=> (clojure.core/print (3 4)) ``` it get `(clojure.core/print (3 4))` not `(clojure.core/print nil)` iti is mean `(print 2 '(3 4))` return (3 4)? -- 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.
