lorentey
/ inference-snafu.swift
Last active
June 2, 2016 22:05
The following snippet compiles under Swift 2.2, but not Swift 3. It defines a (quite useless) left shift operator on `Double` values. For some reason, Swift 3's type inference engine can go awry when such a shift operator is used in a subexpression.
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| public func <<(num: Double, exp: Int) -> Double { | |
| return num * Double(1 << exp) | |
| } | |
| let s = (0.5 << 5) - 1 | |
| print(s) |
lorentey
/ Mutable Class Method.swift
Created
December 12, 2015 00:01
You wouldn't expect calling a method on a class to modify the variable holding a reference to the instance, but it can happen.
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| //: Playground - noun: a place where people can play | |
| import UIKit | |
| protocol MagicProtocol { | |
| } | |
| extension MagicProtocol { | |
| mutating func magic(xyzzy: Self) { | |
| // Mutating methods defined in a protocol extension can mutate `self` even if | |
| // the protocol is implemented by a class. |
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