gistfile1.scala

scala> class UInt(val signedValue: Int) extends AnyVal {
     |   def +(other: UInt) = new UInt(signedValue + other.signedValue)
     |   def -(other: UInt) = new UInt(signedValue - other.signedValue)
     |   def *(other: UInt) = new UInt(signedValue * other.signedValue)
     |   def /(other: UInt) = new UInt(Integer.divideUnsigned(signedValue, other.signedValue))
     | 
     |   override def toString = Integer.toUnsignedString(signedValue)
     | }
defined class UInt

scala> new UInt(1) - new UInt(2)
res1: UInt = 4294967295