Evgeny Gerashchenko
14 lines
367 B
Kotlin
14 lines
367 B
Kotlin
class Pair(x : Int, y : Int) {
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class object {
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fun copy(from : Pair, x : Int = from.x, y : Int = from.y) = Pair(x, y)
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}
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}
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// One can say:
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val p = Point(1, 2)
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val p1 = Point.Copy(p, x = 2)
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val p2 = Point.Copy(p1, y = -1)
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val p3 = Point.Copy(p)
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// Such copy(...) methods can be automatically generated by the compiler
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// whenever there is a primary constructor |