Dactyloidae iOS initial commit

mobile/ios/ThirdParty/Box/Box.swift

@@ -0,0 +1,33 @@
+//  Copyright (c) 2014 Rob Rix. All rights reserved.
+
+/// Wraps a type `T` in a reference type.
+///
+/// Typically this is used to work around limitations of value types (for example, the lack of codegen for recursive value types and type-parameterized enums with >1 case). It is also useful for sharing a single (presumably large) value without copying it.
+public final class Box<T>: BoxType, CustomStringConvertible {
+	/// Initializes a `Box` with the given value.
+	public init(_ value: T) {
+		self.value = value
+	}
+
+
+	/// Constructs a `Box` with the given `value`.
+	public class func unit(_ value: T) -> Box<T> {
+		return Box(value)
+	}
+
+
+	/// The (immutable) value wrapped by the receiver.
+	public let value: T
+
+	/// Constructs a new Box by transforming `value` by `f`.
+	public func map<U>(_ f: (T) -> U) -> Box<U> {
+		return Box<U>(f(value))
+	}
+
+
+	// MARK: Printable
+
+	public var description: String {
+		return String(describing: value)
+	}
+}