Created
December 1, 2015 21:59
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| protocol DefaultInitializable { init() } | |
| protocol StaticStorageType : DefaultInitializable { | |
| typealias Element: DefaultInitializable = Self | |
| static var staticCount: Int { get } | |
| } | |
| extension StaticStorageType { | |
| typealias Plus1 = StaticStorageOfOneMoreThan<Self> | |
| typealias Plus2 = Plus1.Plus1 | |
| typealias Plus3 = Plus2.Plus1 | |
| typealias Times2 = StaticStorageDoubled<Self> | |
| typealias Times4 = Times2.Times2 | |
| typealias Times8 = Times4.Times2 | |
| typealias Times16 = Times8.Times2 | |
| typealias Times32 = Times16.Times2 | |
| static var staticCount: Int { return 1 } | |
| var count: Int { return Self.staticCount } | |
| var indices: Range<Int> { return 0 ..< count } | |
| subscript(i: Int) -> Element { | |
| get { precondition(0 <= i && i < count) | |
| var selfCopy = self | |
| return withUnsafePointer(&selfCopy, { p -> Element in UnsafePointer<Element>(p)[i] }) | |
| } | |
| set { precondition(0 <= i && i < count) | |
| withUnsafeMutablePointer(&self, { p -> Void in UnsafeMutablePointer<Element>(p)[i] = newValue }) | |
| } | |
| } | |
| } | |
| struct StaticStorageOfOne<T: StaticStorageType> : StaticStorageType { | |
| typealias Element = T | |
| let _storage = Element() | |
| } | |
| struct StaticStorageOfOneMoreThan<T: StaticStorageType> : StaticStorageType { | |
| typealias Element = T.Element | |
| let _storage = (Element(), T()) | |
| static var staticCount: Int { return T.staticCount + 1 } | |
| } | |
| struct StaticStorageDoubled<T: StaticStorageType> : StaticStorageType { | |
| typealias Element = T.Element | |
| let _storage = (T(), T()) | |
| static var staticCount: Int { return T.staticCount * 2 } | |
| } | |
| extension UInt8 : StaticStorageType {} | |
| extension Float : StaticStorageType {} | |
| typealias _128_Bytes = UInt8.Times32.Times4 | |
| typealias _11_Floats = Float.Times8.Plus3 | |
| print(strideof(_128_Bytes)) // Prints 128 | |
| print(strideof(_11_Floats)) // Prints 44 ( 44 == 11 * 4 ) | |
| var myThreeFloats = Float.Plus2() | |
| myThreeFloats[0] = 0.1 | |
| myThreeFloats[1] = 1.2 | |
| myThreeFloats[2] = 3.4 | |
| for i in myThreeFloats.indices { print(myThreeFloats[i]) } // Prints the expected |
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