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SetWrapper does not preserve performance / behavior #6364

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scabug opened this issue Sep 11, 2012 · 2 comments
Closed

SetWrapper does not preserve performance / behavior #6364

scabug opened this issue Sep 11, 2012 · 2 comments

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@scabug
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scabug commented Sep 11, 2012

{code}val aScalaSet = Set(1,2,3)
val wrappedSet = new SetWrapper(aScalaSet)

aScalaSet.contains(2) // operation in O(1)
wrappedSet.contains(2) // operation in O(n){code}

Since SetWrapper is not implementing additional methods in top of {code}size(){code} and {code}iterator(){code}, the performance of the wrapped collection is hindered. There are at least 2 issues with that:

  • Neither the wrap semantic or the documentation is indicating this behavior degradation, leaving the user with false assumptions
  • It obviously kill performance when working with large collections

This problem might as well be present in other type of collections.

Suggested resolution: make SetWrapper implements all the java interface set methods that would incur in a loss of performance.

@scabug
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scabug commented Sep 11, 2012

Imported From: https://issues.scala-lang.org/browse/SI-6364?orig=1
Reporter: Julien Letrouit (jletroui)
Affected Versions: 2.9.1, 2.9.2, 2.10.0-M7, 2.11.0-M1

@scabug
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scabug commented Jan 10, 2014

@adriaanm said:
scala/scala#3302

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