xp-plus.kt

fun plus(lhs: Any, rhs: Any): Any {
    return when (lhs) {
        is Short -> {
            when (rhs) {
                is Byte -> lhs + rhs
                is Short -> lhs + rhs
                is Int -> lhs + rhs
                is Long -> lhs + rhs
                is Float -> lhs + rhs
                is Double -> lhs + rhs
                else -> throw IncompatibleTypesException()
            }
        }
        is Byte -> {
            when (rhs) {
                is Byte -> lhs + rhs
                is Short -> lhs + rhs
                is Int -> lhs + rhs
                is Long -> lhs + rhs
                is Float -> lhs + rhs
                is Double -> lhs + rhs
                else -> throw IncompatibleTypesException()
            }
        }
        is Int -> {
            when (rhs) {
                is Byte -> lhs + rhs
                is Short -> lhs + rhs
                is Int -> lhs + rhs
                is Long -> lhs + rhs
                is Float -> lhs + rhs
                is Double -> lhs + rhs
                else -> throw IncompatibleTypesException()
            }
        }
        is Long -> {
            when (rhs) {
                is Byte -> lhs + rhs
                is Short -> lhs + rhs
                is Int -> lhs + rhs
                is Long -> lhs + rhs
                is Float -> lhs + rhs
                is Double -> lhs + rhs
                else -> throw IncompatibleTypesException()
            }
        }
        is Float -> {
            when (rhs) {
                is Byte -> lhs + rhs
                is Short -> lhs + rhs
                is Int -> lhs + rhs
                is Long -> lhs + rhs
                is Float -> lhs + rhs
                is Double -> lhs + rhs
                else -> throw IncompatibleTypesException()
            }
        }
        is Double -> {
            when (rhs) {
                is Byte -> lhs + rhs
                is Short -> lhs + rhs
                is Int -> lhs + rhs
                is Long -> lhs + rhs
                is Float -> lhs + rhs
                is Double -> lhs + rhs
                else -> throw IncompatibleTypesException()
            }
        }
        is String -> lhs + rhs.toString()
        else -> throw IncompatibleTypesException()
    }
}