How can I implement a Class which can ask just like Array, providing indexed setter?
like:
val k = new MyKls(size) k(0) = 2 //<<-- I want this kind of functionality. Thanks.
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1 Answer
It sounds like what you are looking for is the update method. If you define this method, then Scala will use it in the k(0) = 2 syntax. It is similar to the apply method which allows you do use the k(0) accessor syntax.
Here's a short example:
import scala.collection.mutable.Buffer class MyKls(size: Int) { val buf = Buffer.fill(size)(0) def apply(index: Int) = buf(index) def update(index: Int, newValue: Int) { buf(index) = newValue } override def toString = buf.mkString("[", ", ", "]") } val k = new MyKls(5) println(k) // [0, 0, 0, 0, 0] k(0) = 2 println(k) // [2, 0, 0, 0, 0] println(k(0)) // 2 You can find some more detail here.
1 Comment
mpilquist
This question may also be useful in understanding the other special methods: stackoverflow.com/q/1483212/547212