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22 lines
477 B
Scala
22 lines
477 B
Scala
package com.twitter.follow_recommendations.common.utils
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/**
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* Typeclass for any Recommendation type that has a weight
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*
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*/
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trait Weighted[-Rec] {
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def apply(rec: Rec): Double
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}
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object Weighted {
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implicit object WeightedTuple extends Weighted[(_, Double)] {
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override def apply(rec: (_, Double)): Double = rec._2
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}
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def fromFunction[Rec](f: Rec => Double): Weighted[Rec] = {
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new Weighted[Rec] {
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override def apply(rec: Rec): Double = f(rec)
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}
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}
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}
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