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Merge pull request #1361 from def-/setdiff

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Add missing difference and  to sets module
This commit is contained in:
Andreas Rumpf
2014-07-15 19:07:08 +02:00
parent fd0e809934 54d61d2f66
commit f88f082be3
2 changed files with 31 additions and 1 deletions
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11
lib/pure/collections/sets.nim
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@@ -167,6 +167,13 @@ proc intersection*[A](s1, s2: TSet[A]): TSet[A] =
for item in s1:
if item in s2: incl(result, item)
proc difference*[A](s1, s2: TSet[A]): TSet[A] =
## returns a new set of all items that are contained in `s1`, but not in `s2`
result = initSet[A]()
for item in s1:
if not contains(s2, item):
incl(result, item)
proc symmetricDifference*[A](s1, s2: TSet[A]): TSet[A] =
## returns a new set of all items that are contained in either
## `s1` or `s2`, but not both
@@ -182,6 +189,10 @@ proc `*`*[A](s1, s2: TSet[A]): TSet[A] {.inline.} =
## alias for `intersection`
result = intersection(s1, s2)
proc `-`*[A](s1, s2: TSet[A]): TSet[A] {.inline.} =
## alias for `difference`
result = difference(s1, s2)
proc `-+-`*[A](s1, s2: TSet[A]): TSet[A] {.inline.} =
## alias for `symmetricDifference`
result = symmetricDifference(s1, s2)