On Mar 20, 2010, at 2:50 PM, cageface wrote:
So will deftype/protocol be the recommended, idiomatic way to
implement ADTs in Clojure 1.2?
Yes.
Will the current map/struct based
approaches essentially be deprecated?
These are two different things. deftypes will work fine with map-based
code, and doing so is an important part of the design of Clojure. The
intent here is definitely *not* to start building walled gardens of
basic data manipulation logic. If you fund yourself writing
(defprotocol Employee
(get-name [emp]))
you are doing it wrong. We get a lot of leverage in Clojure by having
a large set of functions that can generically manipulate data via
associative abstractions, and deftype types will often be associative
things. Protocols are for adding additional abstractions.
deftype *will* supplant defstruct (or perhaps be used to reimplement it)
The doc here http://www.assembla.com/wiki/show/clojure/Datatypes
suggested to me that they were more for interfacing with Java in a
more efficient manner?
Not at all. They are a very useful abstraction mechanism in their own
right, even if you never implement an interface or expose to Java.
Rich
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