Clojure

Primitive VecSeq does not implement equals or hashing methods

Details

  • Type: Defect Defect
  • Status: Open Open
  • Priority: Major Major
  • Resolution: Unresolved
  • Affects Version/s: Release 1.5
  • Fix Version/s: None
  • Component/s: None
  • Labels:
  • Patch:
    Code and Test
  • Approval:
    Prescreened

Description

VecSeq (as produced by (seq (vector-of :int 1 2 3))) does not implements equals, hashCode, or hasheq and does not play with any other Clojure collections or sequences appropriately in this regard.

user=> (def rs (range 3))
user=> (def vs (seq (vector-of :int 0 1 2)))
user=> rs
(0 1 2)
user=> vs
(0 1 2)
user=> (.equals rs vs)
true
user=> (.equals vs rs)    ;; expect: true
false
user=> (.equiv rs vs)
true
user=> (.equiv vs rs)
true
user=> (.hashCode rs)
29824
user=> (.hashCode vs)     ;; expect to match (.hashCode rs)
2081327893
user=> (System/identityHashCode vs)  ;; show that we're just getting Object hashCode
2081327893
user=> (.hasheq rs)
29824
user=> (.hasheq vs)       ;; expect same as (.hasheq rs) but not implemented at all
IllegalArgumentException No matching field found: hasheq for class clojure.core.VecSeq  clojure.lang.Reflector.getInstanceField (Reflector.java:271)

Approach: Implement Object.hashCode(), Object.equals(), and IHashEq.hasheq() in the primitive vector seq implementation. All of these leverage the prim vec seq itself rather than the underlying prim vec as it was quite a big simpler. The hasheq() impl calls Murmur3/hashOrdered, which takes an Iterable, so Iterable was also implemented using an iterator over the seq.

Some existing tests were expanded to include coverage of the primitive vec seq.

Patch: clj-1364.patch

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Dates

  • Created:
    Updated: