See `define-custom-hash-types` in `racket/dict`. Note that you'll need
to use `dict-ref` instead of `hash-ref`, etc.
Ryan
On 08/04/2016 12:34 PM, Jos Koot wrote:
Hi
As far as I can see a hash has three options only for the equivalence
relation comparing keys: eq?, eqv? and equal?.
Would it be possible to extend Racket such as to allow the preparation
of hashes with a user specified equivalence relation?
May be I can prepare it myself, but I have no idea where to start.
Pointers welcome, of course.
For example, I am interested in a hash with the following equivalence
relation for its keys:
(lambda (x y) (equal? (sort x <) (sort y <)))
x : exact-nonnegative-integer?
y : exact-nonnegative-integer?
Thanks, Jos
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