This is a Swift microframework which implements Box<T> & MutableBox<T>, with implementations of ==/!= where T: Equatable.

Box is typically used to work around limitations of value types:

• recursive structs/enums
• type-parameterized enums where more than one case has a value

Wrapping & unwrapping a Box:

// Wrap: letbox=Box(1) // Unwrap: letvalue= box.value

Changing the value of a MutableBox:

// Mutation: letmutableBox=MutableBox(1) mutableBox.value =2

Building a recursive value type:

structBinaryTree{letvalue:Intletleft:Box<BinaryTree>?letright:Box<BinaryTree>?}

Building a parameterized enum:

enumResult<T>{case Success(Box<T>)case Failure(NSError)}

See the sources for more details.

1. Add this repo as a submodule in e.g. External/Box:

    git submodule add https://github.com/robrix/Box.git External/Box 

2. Drag Box.xcodeproj into your .xcworkspace/.xcodeproj.

3. Add Box.framework to your target’s Link Binary With Libraries build phase.

4. You may also want to add a Copy Files phase which copies Box.framework (and any other framework dependencies you need) into your bundle’s Frameworks directory. If your target is a framework, you may instead want the client app to include Box.framework.