LamportClock.scala

import scala.language.postfixOps

class LamportClock(private var count: Int = 0) {
    // increment
    def ++ = LamportClock(count + 1)

    // merge
    def +(other: LamportClock) = new LamportClock(math.max(count, other.count) + 1)

    override def toString: String = s"LamportClock($count)"
}

object LamportClock {
    def apply(count: Int = 0): LamportClock = new LamportClock(count)
}

val a = LamportClock(1)
val b = LamportClock(4)

println(a)
println(b)
println(a++)
println(a + b)

a: LamportClock = LamportClock(1)
b: LamportClock = LamportClock(4)

LamportClock(1)
LamportClock(4)
LamportClock(2)
LamportClock(5)