next enum in swift

```cpp enum Iter: Int{ case s1=0, s2, s3, s4 mutating func next(){ if self == .s4 { self = .s1 return } self = Iter.fromRaw(self.toRaw()+1)! } }

var s = Iter.s1

for i in 1 .. 10 { println(s.toRaw()) s.next() } ```

博客园的编辑器支持好简陋

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