関数の引数に呼び出し元からの変数を渡して、関数内でその引数の値を変更して返すのにはinoutを使う。引数として渡す変数には”&”を前につける。
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| func plusFive(inout num:Int){ | |
| num += 5 | |
| } | |
| var num : Int = 3 | |
| println(num) //3 | |
| plusFive(&num) | |
| println(num) //8 |
[結果]
3
8
