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既存クラスにメソッド追加

Posted at 2014-01-12

##例1: Doubleクラスに単位変換メソッドを追加

implicit def convert(d:Double) = new {
  //ミリ→ポイント変換
  def mmToPoint = {d * 2.835}
  //ポイント→ミリ変換
  def pointToMm = {d * 0.353}
}


val originalMm = 100d
val point = originalMm.mmToPoint

val originalPoint = 100d
val mm = originalPoint.pointToMm