Hello,
Since maps are functions of their keys, I think you can get away with
something like:
(def unbox {Byte Byte/TYPE
Integer Integer/TYPE})
(unbox Integer) ;int
Regarding your let/defn, I think in general if you have functions that
depend on compile-time constants it's idiomatic to def them.
Cheers,
Alan
On May 6, 11:08 am, B Smith-Mannschott <bsmith.o...@gmail.com> wrote:
> On Thu, May 6, 2010 at 15:22, Stuart Halloway <stuart.hallo...@gmail.com>
> wrote:
> > Reflection is slow, there are less than ten of these, and the possible set
> > ain't gonna change.
>
> > I would write a function that looks them up from a map.
>
> Yea, I considered that too. The only reason I didn't was because of a
> misguided desire not to hardcode things.
>
> But, you're right. My solution isn't optimal. The set of classes which
> box java primitives is not going to change.
>
> (let [m {Byte Byte/TYPE, Short Short/TYPE,
> Integer Integer/TYPE, Long Long/TYPE,
> Boolean Boolean/TYPE, Character Character/TYPE,
> Float Float/TYPE, Double Double/TYPE}]
> (defn unbox [class]
> (m class class)))
>
> I've defined 'm' in a let containing the definition of unbox because
> I'm assuming that if I'd inlined it at the point where I use m that it
> would get constructed once for every function call, but I don't
> actually know that:
>
> (defn unbox [class]
> ({Byte ...} class class))
>
> Would Clojure be smart enough to recognize that {Byte ...} is a
> compile-time constant expression and not rebuild it on every call to
> unbox?
>
> // Ben
>
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