Evgeny Gerashchenko
20 lines
570 B
Kotlin
20 lines
570 B
Kotlin
type Comparison<in T> = (T, T) -> Int
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fun naturalOrder<in T : Comparable<T>>(a : T, b : T) : Int = a.compareTo(b)
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fun castingNaturalOrder(a : Object, b : Object) : Int = (a as Comparable<Object>).compareTo(b as Comparable<Object>)
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enum class ComparisonResult {
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LS; EQ; GR
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}
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type MatchableComparison<in T> = (T, T) -> ComparisonResult
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fun asMatchableComparison<T>(cmp : Comparison<T>) : MatchableComparison<T> = {(a, b) ->
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val res = cmp(a, b)
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if (res == 0) return ComparisonResult.EQ
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if (res < 0) return ComparisonResult.LS
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return ComparisonResult.GR
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}
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