using in Scala

Control.scala

//close automatically after use
//How to use
//import Control.using
//using(someDbConnection1,  someDbConnection2) {(db1, db2) =>
//  doSomething(db1, db2)
//}

object Control {
  
  type T = {def close(): Unit}

  def using[Closeable <: T, B](closeable: Closeable)(getB: Closeable => B): B = {
    try {
      getB(closeable)
    } finally {
      closeable.close
    }
  }
  
  def using[Closeable1 <: T, Closeable2 <: T, B]
           (closeable1: Closeable1, closeable2: Closeable2)
           (getB: (Closeable1, Closeable2) => B): B = {
    try {
      getB(closeable1, closeable2)
    } finally {
      try {
        closeable1.close
      } finally {
        closeable2.close
      }
    }
  }

  def using[Closeable1 <: T, Closeable2 <: T, Closeable3 <: T, B]
           (closeable1: Closeable1, closeable2: Closeable2, closeable3: Closeable3)
           (getB: (Closeable1, Closeable2, Closeable3) => B): B = {
    try {
      getB(closeable1, closeable2, closeable3)
    } finally {
      try {
        closeable1.close
      } finally {
        try {
          closeable2.close
        } finally {
          closeable3.close
        }
      }
    }
  }
  
}