On May 9, 8:00 am, Simon Katz <[email protected]> wrote:
> I'm trying to implement a function similar to new, but where
> the type is not known at compile time -- so I want to evaluate
> the first argument.
>
> With the help of Google, I found the approach used in new*
> below:
>
> (ns dynamic-new)
>
> (defn new* [type-name-as-symbol & args]
> (clojure.lang.Reflector/invokeConstructor
> (resolve type-name-as-symbol)
> (to-array args)))
> Now my questions:
>
> Q1. Is this basically the right approach, or is there some other
> way to implement new*?
>
Is there a reason that you need to pass a symbol, rather than the
Class object itself? eg:
(defrecord Foo [a b])
(defn new* [klass & args]
(clojure.lang.Reflector/invokeConstructor klass (to-array args)))
(new* Foo 23 "hello")
#:user.Foo{:a 23, :b "hello"}
- Chris Perkins
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