在Scalatra示例代码中找到Scala中的Tilde [英] Tilde in Scala found in Scalatra example code

问题描述

刚开始学习此示例代码以了解Scalatra中的命令:

Just ran into this sample code learning about Commands in Scalatra:

 protected def handle: Handler  = {
    case c: CreateTodoCommand => 
      add(newTodo(~c.name.value))
  }

在这种特殊情况下，~c.name.value中~的确切含义是什么?不确定在哪里可以找到有关该特殊符号的更多文档.

In this particular case, what exactly is the relevance of ~ in ~c.name.value? Not sure where to find more documentation on this particular symbol.

推荐答案

在Scala中:

~x

翻译为

x.unary_~

(这也适用于+，-和!，如这篇文章中所述).因此，您的示例翻译为:

(this also applies to +,- and ! as explained in this post). So your example translates to:

add(newTodo(c.name.value.unary_~))

因此可以在value类型下找到该文档.

The documentation can hence be found at the type of value.

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