15 lines
429 B
Plaintext
15 lines
429 B
Plaintext
class Date(y: Int, m: Int, d: Int) extends Ord:
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// previous decls here
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def <(that: Any): Boolean = that match
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case d: Date =>
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(year < d.year) ||
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(year == d.year && (month < d.month ||
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(month == d.month && day < d.day)))
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case _ => sys.error("cannot compare " + that + " and a Date")
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end <
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end Date
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// From https://docs.scala-lang.org/tutorials/scala-for-java-programmers.html
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