Simple Example of Using a Scala Implicit with sbt and the REPL

Scala Implicit Example

This gist shows a VERY simple use of Scala implicits and how to use it from 
sbt & the scala console. 

Create these two files... 
=============================================================================
Xp.scala
-----------------------------------------------------------------------------
package xp {
  class Xp { 
	def beep() = { println("beep!") } 
  }
  object Xp { 
	implicit def string2Xp(s: String) : Xp = { new Xp } 
  }
} 

=============================================================================
Yp.scala
-----------------------------------------------------------------------------]
package xp { 
  object Yp { 
	import xp.Xp._
	def apply(): Unit = { "a".beep } 
  }
}
=============================================================================

Now, in your console at the command line...


langley@home:$ ls
Xp.scala  Yp.scala
langley@home:$ sbt
[info] Set current project to default-f28379 (in build file:/local/home/langley/lab/hacking/xplicits/)
> compile
[info] Updating {file:/local/home/langley/lab/hacking/xplicits/}default-f28379...
[info] Resolving org.scala-lang#scala-library;2.9.1 ...
[info] Done updating.
[info] Compiling 2 Scala sources to /local/home/langley/lab/hacking/xplicits/target/scala-2.9.1/classes...
[success] Total time: 5 s, completed Jan 7, 2012 11:48:52 AM
> console
[info] Starting scala interpreter...
[info] 
Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_21).
Type in expressions to have them evaluated.
Type :help for more information.

scala> val y = xp.Yp
y: xp.Yp.type = xp.Yp$@71d9a2ab

scala> y()
beep!

scala> 
[success] Total time: 59 s, completed Jan 7, 2012 11:49:54 AM
> langley@home:$