Yes, it was working as a reader macro and messing me up. Using
hashmap worked. Thanks.
On Feb 3, 8:03 pm, "Stephen C. Gilardi" <squee...@mac.com> wrote:
> On Feb 3, 2009, at 7:45 PM, Jeffrey Straszheim wrote:
>
> > Btw, I fixed the ~ needed on relation. It didn't help. It seems I
> > just can't put a ~@ form inside of a { } set builder.
>
> { } reads a literal map. It appears to expect an even number arguments
> between the curly braces at read time. You can work around this by
> calling hash-map instead of using a map literal.
>
> #{ } reads a literal set. That works.
>
> Some examples:
>
> user=> (defmacro j [& formals] `...@formals})
> #'user/j
> user=> (j 1 2 3 4)
> #{1 2 3 4}
> user=> (defmacro j [& formals] `...@formals})
> java.lang.ArrayIndexOutOfBoundsException: 1
> java.lang.Exception: Unmatched delimiter: )
> user=> (defmacro j [& formals] `(hash-map ~...@formals))
> #'user/j
> user=> (j 1 2 3 4)
> {1 2, 3 4}
>
> My impression is that the preferred way to write this would be the one
> calling hash-map. I'm not exactly sure why the one using #{} works.
>
> --Steve
>
> smime.p7s
> 3KViewDownload
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