扩展集合时，Scala返回类型 [英] Scala return type when extending collection

问题描述

如果我写

class Things扩展了scala.collection.immutable.HashSet [Int]

class Things extends scala.collection.immutable.HashSet[Int]

新事物+ 5

那么结果就是

res0:scala.collection.immutable.HashSet [Int] = Set(5)

res0: scala.collection.immutable.HashSet[Int] = Set(5)

要使结果成为事物类型，我需要做些什么?我怀疑答案可能是在此处，但正在努力了解正在发生的事情.

What do I need to do for the result to be of type Things? I suspect the answer might be here, but am struggling to understand what's going on.

推荐答案

没有您的代码样本，我真的无法告诉您，但是您可以看一下Jesse Eichar的帖子，其中提供了实现自定义集合的完整过程并很好地解决了您的问题.

I can't really tell without a sample of your code but you can take a look at Jesse Eichar's post which provides a walk through the implementation of a custom collection and addresses your question nicely.

http://daily-scala.blogspot.com/2010/04/creating-custom-traversable.html

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