Kotlin 枚举 enum 与函数

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data class Coordinate(var x: Int, var y: Int) {
    operator fun plus(c2: Coordinate2) = Coordinate(x + c2.x, y + c2.y)

}
enum class Direction (private val coordinate:Coordinate){
    EAST(Coordinate(1,0)),
    WEST(Coordinate(-1,0)),
    SOUTH(Coordinate(0,1)),
    NORTH(Coordinate(0,-1));

    fun updateCoordinate(playerCoordinate:Coordinate)=Coordinate(playerCoordinate.x+coordinate.x,playerCoordinate.y+coordinate.y)

}

fun main() {
    println(Direction.EAST.updateCoordinate(Coordinate(10, 20)))
}