On Aug 11, 7:03 pm, Shantanu Kumar <kumar.shant...@gmail.com> wrote:
> I tried to assign a data type to a var and then instantiate it using
> the var, but it doesn't seem to work:
>
> user=> (defrecord X [])
> user.X
>
> user=> (X.)
> #:user.X{}
>
> user=> X
> user.X
>
> user=> (def hey X)
> #'user/hey
>
> user=> (hey.)
> java.lang.IllegalArgumentException: Unable to resolve classname: hey
> (NO_SOURCE_FILE:59)
>
> user=> (new X)
> #:user.X{}
>
> user=> (new hey)
> java.lang.IllegalArgumentException: Unable to resolve classname: hey
> (NO_SOURCE_FILE:61)
>
> user=> (apply new hey)
> java.lang.Exception: Unable to resolve symbol: new in this context
> (NO_SOURCE_FILE:62)
>
> Can anybody help me understand how to accomplish this when using the
> var? This will give me a generic way to instantiate the type when I
> know the parameters.
>
> Regards,
> Shantanu

There is no way to do this without using Java reflection, see e.g.

user=> (defrecord A [])
user.A
user=> (def x A)
#'user/x
user=> (.newInstance x)
#:user.A{}
user=>

Note .newInstance is a simple example and only works for no-arg
constructor.


See, e.g.,
http://download.oracle.com/javase/tutorial/reflect/member/ctorInstance.html





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