Added the codes used for operator overloading article
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enum class Currency {
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DOLLARS, EURO
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}
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class Money(val amount: BigDecimal, val currency: Currency) : Comparable<Money> {
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override fun compareTo(other: Money): Int =
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convert(Currency.DOLLARS).compareTo(other.convert(Currency.DOLLARS))
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fun convert(currency: Currency): BigDecimal = TODO()
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override fun equals(other: Any?): Boolean {
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if (this === other) return true
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if (other !is Money) return false
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if (amount != other.amount) return false
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if (currency != other.currency) return false
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return true
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}
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override fun hashCode(): Int {
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var result = amount.hashCode()
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result = 31 * result + currency.hashCode()
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return result
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}
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}
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interface Page<T> {
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fun pageNumber(): Int
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fun pageSize(): Int
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fun elements(): MutableList<T>
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}
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operator fun <T> Page<T>.get(index: Int): T = elements()[index]
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operator fun <T> Page<T>.get(start: Int, endExclusive: Int): List<T> = elements().subList(start, endExclusive)
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operator fun <T> Page<T>.set(index: Int, value: T) {
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elements()[index] = value
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}
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operator fun <T> Page<T>.contains(element: T): Boolean = element in elements()
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operator fun <T> Page<T>.iterator() = elements().iterator()
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data class Point(val x: Int, val y: Int)
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operator fun Point.unaryMinus() = Point(-x, -y)
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operator fun Point.not() = Point(y, x)
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operator fun Point.inc() = Point(x + 1, y + 1)
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operator fun Point.dec() = Point(x - 1, y - 1)
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operator fun Point.plus(other: Point): Point = Point(x + other.x, y + other.y)
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operator fun Point.minus(other: Point): Point = Point(x - other.x, y - other.y)
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operator fun Point.times(other: Point): Point = Point(x * other.x, y * other.y)
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operator fun Point.div(other: Point): Point = Point(x / other.x, y / other.y)
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operator fun Point.rem(other: Point): Point = Point(x % other.x, y % other.y)
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operator fun Point.times(factor: Int): Point = Point(x * factor, y * factor)
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operator fun Int.times(point: Point): Point = Point(point.x * this, point.y * this)
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interface View
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class TextView(val value: String) : View
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class ImageView(val url: String) : View
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class UI {
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private val views = mutableListOf<View>()
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operator fun String.unaryPlus() {
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views.add(TextView(this))
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}
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operator fun View.unaryPlus() {
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views.add(this)
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}
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}
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fun ui(init: UI.() -> Unit): UI {
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val ui = UI()
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ui.init()
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return ui
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}
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fun main(args: Array<String>) {
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val header = ui {
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+ImageView("http://logo.com")
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+"Brand name"
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+"Brand description"
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}
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}
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operator fun <T> MutableCollection<T>.plusAssign(element: T) {
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add(element)
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}
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operator fun BigInteger.plus(other: Int): BigInteger = add(BigInteger("$other"))
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