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lachezar/currency_example.scala

Last active November 30, 2020 16:07
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currency_example.scala
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currency_example.scala
sealed trait Currency
case object Dollar extends Currency
case object Euro extends Currency
case class Money[T <: Currency](value: Int, currency: T) {
def +(that: Money[T]): Money[T] = {
Money[T](this.value + that.value, currency)
}
}
val a = Money(5, Dollar)
val b = Money(5, Euro)
val c = Money(3, Dollar)
val d = Money(10, Euro)
// a + b - does not compile!
println(a + c)
println(b + d)
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