Sophie a écrit :
(deftype A [x]) gives me an accessor (:x anA)
Then I decide to change data representation of A without impacting
client code, but I don't seem able to define a function
(defn :x [anA] ...)
Should I be doing something different?
(:x anA) is not a special accessor function, it's just the standard use
of a keyword as a lookup function for a map. Every type created by
deftype behaves like a map with the field names as its keys. So if you
change the field name, you ned to change the keyword used for retrieving
the value.
If you want to provide an interface to your type that does not depend on
your choice of field names, define your own accessor functions. For example
(deftype A [x])
(def get-A-value :x)
As long as you only use get-A-value in client code, you are free to
change the field names in A.
Konrad
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