What does a single apostrophe mean in Scala? [duplicate]
In this slide show on ScalaActors.pdf what does the single quote indicate when the message is sent to the pong actor?
class Ping(count: int, pong: Pong) extends Actor {
def act() {
pong ! 'Ping // what does the single quote indicate???
receive {
case 'Pong =>
}
}
}
It indicates a Symbol. Eg. 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").