How to use Namespaces in Swift?

Question

The documentation only mentions nested types, but it\'s not clear if they can be used as namespaces. I haven\'t found any explicit mentioning of namespaces.

Answer 1

While doing some experimentation with this I ended up creating these "namespaced" classes in their own files by extending the root "package". Not sure if this is against best practices or if it has any implications I'm mot aware of(?)

AppDelegate.swift

var n1 = PackageOne.Class(name: "Package 1 class")
var n2 = PackageTwo.Class(name: "Package 2 class")

println("Name 1: \(n1.name)")
println("Name 2: \(n2.name)")

PackageOne.swift

import Foundation

struct PackageOne {
}

PackageTwo.swift

import Foundation

struct PackageTwo {
}

PackageOneClass.swift

extension PackageOne {
    class Class {
        var name: String
        init(name:String) {
            self.name = name
        }
    }
}

PackageTwoClass.swift

extension PackageTwo {
    class Class {
        var name: String
        init(name:String) {
            self.name = name
        }
    }
}

---

Edit:

Just found out that creating "subpackages" in above code wont work if using separate files. Maybe someone can hint on why that would be the case?

Adding following files to the above:

PackageOneSubPackage.swift

import Foundation

extension PackageOne {
    struct SubPackage {
    }
}

PackageOneSubPackageClass.swift

extension PackageOne.SubPackage {
    class Class {
        var name: String
        init(name:String) {
            self.name = name
        }
    }
}

Its throwing a compiler error: 'SubPackage' is not a member type of 'PackageOne'

If I move the code from PackageOneSubPackageClass.swift to PackageOneSubPackage.swift it works. Anyone?

Edit 2:

Fiddling around with this still and found out (in Xcode 6.1 beta 2) that by defining the packages in one file they can be extended in separate files:

public struct Package {
  public struct SubPackage {
    public struct SubPackageOne {
    }
    public struct SubPackageTwo {
    }
  }
}

Here are my files in a gist: https://gist.github.com/mikajauhonen/d4b3e517122ad6a132b8