Scala 中的单个撇号是什么意思？
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What does a single apostrophe mean in Scala?
提问by JeffV
In this slide show on ScalaActors.pdfwhat does the single quote indicate when the message is sent to the pong actor?
在ScalaActors.pdf上的这张幻灯片中，单引号表示何时将消息发送给乒乓球演员？
class Ping(count: int, pong: Pong) extends Actor {
def act() {
pong ! 'Ping // what does the single quote indicate???
receive {
case 'Pong =>
}
}
}
回答by Alex Martelli
It indicates a Symbol. Eg. cfr http://www.scala-lang.org/docu/files/api/scala/Symbol.html:
它表示一个符号。例如。cfr http://www.scala-lang.org/docu/files/api/scala/Symbol.html：
the Scala term 'mysym will invoke the constructor of the Symbol class in the following way: Symbol("mysym").
Scala 术语'mysym 将通过以下方式调用Symbol 类的构造函数：Symbol("mysym")。
