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Speed up Set/Dictionary init from Sequence #5267

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Merged
merged 1 commit into from
Oct 19, 2016
Merged

Speed up Set/Dictionary init from Sequence #5267

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2 changes: 1 addition & 1 deletion stdlib/public/core/HashedCollections.swift.gyb
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Original file line number Diff line number Diff line change
Expand Up @@ -762,7 +762,7 @@ public struct Set<Element : Hashable> :
/// - Parameter sequence: The elements to use as members of the new set.
public init<Source : Sequence>(_ sequence: Source)
where Source.Iterator.Element == Element {
self.init()
self.init(minimumCapacity: sequence.underestimatedCount)
if let s = sequence as? Set<Element> {
// If this sequence is actually a native `Set`, then we can quickly
// adopt its native storage and let COW handle uniquing only
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