Kotlin操作符重载

OperatorOverloading.kt

data class Money(val currency: String, val amount: Int)


operator fun Money.plus(other: Money): Money {
    if (currency != other.currency) {
        throw IllegalArgumentException("currency 不匹配!")
    }
    return copy(amount = amount + other.amount)
}

fun main(args: Array<String>) {
    val one = Money("RMB", 100)
    val two = Money("RMB", 200)
    val three = one + two
    println(three)
}