Scala: ローンパターン2

gistfile1.scala

import collection.JavaConversions._
import java.net.URL
import org.apache.commons.io.IOUtils

object scalatest
{
  def closing[T <: {def close(): Unit}, R](a: T)(f: T => R): R = {
    try {
      f(a)
    } finally {
      a.close()
    }
  }

  def main(args: Array[String])
  {
    closing(new URL("http://www.google.com/").openStream) { s =>
      println(IOUtils.toString(s, "UTF-8"))
    }
  }
}