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Ran 07 Feb 2017 03:02AM UTC

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Committed 07 Feb 2017 02:50AM UTC coverage: 100.0%. First build

Job # 746.2

Build Type

push

travis-ci

Committed by

lloydmeta

Commit Message

Add containsAll/subSetOf comparisons

Results
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[info] Benchmark                                         Mode  Cnt   Score   Error  Units
[info] SetComparisons.enumeratumScalaSetSubsetOffSmall   avgt   30   9.248 ± 0.109  ns/op
[info] SetComparisons.enumeratumScalaSetSubsetOffMedium  avgt   30  29.358 ± 0.287  ns/op
[info] SetComparisons.enumeratumScalaSetSubsetOffAll     avgt   30   2.469 ± 0.012  ns/op
[info] SetComparisons.jEnumEnumSetContainsAllSmall       avgt   30   3.888 ± 0.953  ns/op
[info] SetComparisons.jEnumEnumSetContainsAllMedium      avgt   30   3.457 ± 0.127  ns/op
[info] SetComparisons.jEnumEnumSetContainsAllAll         avgt   30   3.321 ± 0.827  ns/op

Discussion
----------
As expected, we have O(m) for subset checking on a hash of m elements against one of n elements.
Looking at the source code confirms that we are doing a forall check ;) Funnily enough, subset
check when the sets contain exactly the same elements is crazy fast (!), beating out EnumSet.

EnumSet really shines here because of its ability to do a bitwise AND operation, fulfilling its
O(1) promise.

The ability to do a constain time, fast subset check makes it worthwhile considering a similar
EnumSet for Enumeratum (backed by an bitrep of member indices).

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