> That doesn't seem to be possible - I can't find a function that
> accepts a PersistentStructMap and returns the symbol passed to struct
> so it knows the keylist to use for the arguments. Nor could I find the
> magic incantation to let me use those symbol names with derive, which
> would let me use keywords for them. I got something working by having
> the dispatch function use sets of keys from the maps, but that seems
> fragile. Writing defFOO and FOO macros that attached the appropriate
> metadata to each struct seem possible, but sorta ugly.
I believe this is the current way to do it. For each struct type I
intend to use in this way, I write a
(defn make-A [a b c]
(with-meta (struct A a b c) {:type ::A}))
function and use this to construct all of my struct instances.
Future versions of Clojure will have datatypes [1], which improve on
structmaps in many ways (typed fields, real type fields for
multimethod dispatch, ...), as well as protocols [2], which will
replace many instances of multimethods.
[1] http://www.assembla.com/wiki/show/clojure/Datatypes
[2] http://www.assembla.com/wiki/show/clojure/Protocols
They are there in the "new" branch to be tried out, although I think
details are still subject to change.
-Jason
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