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added mget for TSet

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This commit is contained in:
Andreas Rumpf
2014-04-13 00:33:06 +02:00
parent f862e80be9
commit 455c3c19ca
1 changed files with 9 additions and 0 deletions
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9
lib/pure/collections/sets.nim
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@@ -68,6 +68,15 @@ template rawInsertImpl() {.dirty.} =
proc rawGet[A](s: TSet[A], key: A): int =
rawGetImpl()
proc mget*[A](s: var TSet[A], key: A): var A =
## returns the element that is actually stored in 's' which has the same
## value as 'key' or raises the ``EInvalidKey`` exception. This is useful
## when one overloaded 'hash' and '==' but still needs reference semantics
## for sharing.
var index = rawGet(s, key)
if index >= 0: result = t.data[index].key
else: raise newException(EInvalidKey, "key not found: " & $key)
proc contains*[A](s: TSet[A], key: A): bool =
## returns true iff `key` is in `s`.
var index = rawGet(s, key)