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[Integer protocols] Make .negate() the customization point #4413

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Merged
merged 1 commit into from
Aug 19, 2016
Merged

[Integer protocols] Make .negate() the customization point #4413

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6 changes: 4 additions & 2 deletions stdlib/public/core/Integers.swift.gyb
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Original file line number Diff line number Diff line change
Expand Up @@ -159,12 +159,14 @@ public protocol SignedArithmetic : Arithmetic {
extension SignedArithmetic {
@_transparent
public func negated() -> Self {
return Self().subtracting(self)
var result = self
result.negate()
return result
}

@_transparent
public mutating func negate() {
self = negated()
self = Self().subtracting(self)
}
}

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