Scala:为什么我可以将Int转换为Unit? [英] Scala: Why can I convert Int to Unit?

问题描述

我最近开始使用Scala(2.8)，并注意到我可以编写以下代码(在Scala解释器中):

I've recently started playing with Scala (2.8) and noticed the I can write the following code (in the Scala Interpreter):

scala> var x : Unit = 10
x : Unit = ()

目前尚不清楚发生了什么.我真的没想到会看到任何对 Unit 的隐式转换.

It's not obvious what's going on there. I really didn't expect to see any implicit conversion to Unit.

推荐答案

请参见"6.26.1值转换" 部分. org/sites/default/files/linuxsoft_archives/docu/files/ScalaReference.pdf#page = 104"rel =" noreferrer"title =" Scala语言规范> Scala语言规范 2.8版:

See section "6.26.1 Value Conversions" in the Scala Language Specification version 2.8:

...

丢弃值.如果e具有某种值类型，并且预期的类型为Unit，则将转换e 通过将其嵌入术语{ e; () }中，将其更改为预期的类型.

Value Discarding. If e has some value type and the expected type is Unit, e is converted to the expected type by embedding it in the term { e; () }.

...

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