In rutilsx I have called generic access operator ? - see here: https://github.com/vseloved/rutils/blob/master/contrib/generic.lisp

It allows the accessor code to stand up a bit, which I consider a good property. It is also chainable.

Here's an example usage (totals, weights and timestamps here are hash-tables of hash-tables):

(defmethod update1 ((model avg-perceptron) f class val)

  (with-slots (step timestamps weights totals) model

    (incf (? totals class f) (* (- step (? timestamps class f))

                                          (? weights class f)))

    (incf (? weights class f) val)

    (setf (? timestamps class f) step)))

AT also seems a decent choice

---

Vsevolod Dyomkin

+38-096-111-41-56

skype, twitter: vseloved

On Thu, Feb 4, 2016 at 8:03 PM, Antoniotti Marco <antoniotti.marco@disco.unimib.it> wrote:

Dear all,

in the quest for RESTHBDB) RE-doing Stuff That Has Been Done Before) I am trying to come up with a name for a referencing/dereferencing operator.

Think of something like

(<name-of-reference-operator> #2A((1 0) (0 1)) 0 0) ==> 1

of

(<name-of-reference-operator> #H((foo . bar) (we . 42)) ‘foo) ==> BAR ; I am cheating.   #H(..) is a hash table.

SETF methods will be defined as expected.

Now.  What could be a good name?  I have the following list.

REF

REF$

[]

[[]]

AT

@

GETAT

What do you think? (Full disclosure: I usually refrain from taking up non alphabetic names)

Cheers

MA

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