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Add "by" to object Ordering #3155

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scabug opened this issue Mar 8, 2010 · 2 comments
Closed

Add "by" to object Ordering #3155

scabug opened this issue Mar 8, 2010 · 2 comments
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scabug commented Mar 8, 2010

I'd like to have a by in object Ordering, as it is pretty much what I intend everywhere I use fromLessThan. Seems pretty straight-forward:

def by[A, B: Ordering](f: A => B): Ordering[A] = Ordering.fromLessThan((x, y) => implicitly[Ordering[B]].lt(f(x), f(y)))
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scabug commented Mar 8, 2010

Imported From: https://issues.scala-lang.org/browse/SI-3155?orig=1
Reporter: @dcsobral

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scabug commented Mar 15, 2010

@axel22 said:
(In r21174) Fixes #3155. No review is necessary.

@scabug scabug closed this as completed May 18, 2011
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