On similar lines as Ben suggested (but different use case), here's
what I've been doing to rewrite expressions:
(defmacro rewrite-v2
[src & body]
(let [[a x y] (repeatedly gensym)]
`(let [~(with-meta a {:tag "doubles"}) ~src
~x (aget ~a 0)
~y (aget ~a 1)]
~@(postwalk-replace {'x x 'y y} body))))
This allows me to write things like:
(rewrite-v2 buf (Math/sqrt (+ (* x x) (* y y))))
...and replaces all `x` & `y` with values looked up from the given array.
More elaborate examples/versions of this are here:
https://github.com/thi-ng/geom/blob/master/geom-core/src/vector.org#vec2-1
Hth!
On 31 March 2015 at 14:51, Mike Haney <txmikes...@gmail.com> wrote:
> You also might want to check out this talk http://youtu.be/YHctJMUG8bI
>
> In part of the talk, he describes how they generate symbols deterministically
> to use in query fragments that can be predictably combined into Datomic
> queries. Different application, but mostly the same requirements as you
> stated.
>
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