Add biased operators to Ior #1500
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Current coverage is 92.12% (diff: 100%)@@ master #1500 diff @@
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Files 246 246
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edmundnoble
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edmundnoble
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johnynek
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| @@ -91,6 +96,10 @@ sealed abstract class Ior[+A, +B] extends Product with Serializable { | |||
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| final def merge[AA >: A](implicit ev: B <:< AA, AA: Semigroup[AA]): AA = | |||
| fold(identity, ev.apply, (a, b) => AA.combine(a, b)) | |||
| final def mergeLeft[AA >: A](implicit ev: B <:< AA): AA = | |||
| fold(identity, ev.apply, (a, _) => a) | |||
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I don't think you need ev.apply here. I think B <:< AA is already a function B => AA so you can pass it directly without allocating another closure.
Although, it would be interesting to know if scalac avoids allocating a closure when you do fn.apply and instead just passes fn.
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Good point, fixed it in merge too.
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👍, looks reasonable to me. |
johnynek
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Jan 2, 2017
| @@ -28,6 +28,11 @@ sealed abstract class Ior[+A, +B] extends Product with Serializable { | |||
| case Ior.Both(a, b) => fab(a, b) | |||
| } | |||
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| final def putLeft[AA >: A](left: AA): AA Ior B = | |||
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actually, why does this need to be AA >: A and not just AA? Aren't we fully replacing? Same with putRight?
Add put operators, make ev.apply explicit Add putLeft and putRight tests Use ev directly instead of eta-expanding More polymorphism, thanks johnynek
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Thanks @johnynek, fixed. |
johnynek
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Jan 3, 2017
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Ior is sometimes used in a very biased way. These tools make for convenient use in that case.