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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| package cats | ||
| package instances | ||
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| trait HashInstances { | ||
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| implicit val catsContravariantForHash: Contravariant[Hash] = | ||
| new Contravariant[Hash] { | ||
| /** | ||
| * Derive a `Hash` for `B` given an `Hash[A]` and a function `B => A`. | ||
| */ | ||
| def contramap[A, B](ha: Hash[A])(f: B => A): Hash[B] = Hash.by(f)(ha) | ||
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| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| package cats | ||
| package syntax | ||
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| import cats.macros.Ops | ||
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| trait HashSyntax { | ||
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| implicit def catsSyntaxHash[A: Hash](a: A): HashOps[A] = | ||
| new HashOps[A](a) | ||
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| } | ||
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| final class HashOps[A: Hash](a: A) { | ||
| /** | ||
| * Gets the hash code of this object given an implicit `Hash` instance. | ||
| */ | ||
| def hash: Int = macro Ops.unop0[Int] | ||
| } |
55 changes: 55 additions & 0 deletions
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kernel-laws/src/main/scala/cats/kernel/laws/HashLaws.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| package cats.kernel | ||
| package laws | ||
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| import org.typelevel.discipline._ | ||
| import org.scalacheck._ | ||
| import org.scalacheck.Prop._ | ||
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| import scala.util.hashing._ | ||
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| object HashLaws { | ||
| def apply[A : Eq : Arbitrary]: HashLaws[A] = | ||
| new HashLaws[A] { | ||
| def Equ = implicitly[Eq[A]] | ||
| def Arb = implicitly[Arbitrary[A]] | ||
| } | ||
| } | ||
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| /** | ||
| * @author Tongfei Chen | ||
| */ | ||
| trait HashLaws[A] extends Laws { | ||
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| implicit def Equ: Eq[A] | ||
| implicit def Arb: Arbitrary[A] | ||
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| def hash(implicit A: Hash[A]): HashProperties = new HashProperties( | ||
| name = "hash", | ||
| parent = None, | ||
| "compatibility-hash" -> forAll { (x: A, y: A) => | ||
| !(A.eqv(x, y)) || (Hash.hash(x) == Hash.hash(y)) | ||
| } | ||
| ) | ||
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| def sameAsUniversalHash(implicit A: Hash[A]): HashProperties = new HashProperties( | ||
| name = "sameAsUniversalHash", | ||
| parent = None, | ||
| "same-as-universal-hash" -> forAll { (x: A, y: A) => | ||
| (A.hash(x) == x.hashCode) && (Hash.fromUniversalHashCode[A].hash(x) == x.hashCode()) && | ||
| (A.eqv(x, y) == Hash.fromUniversalHashCode[A].eqv(x, y)) | ||
| } | ||
| ) | ||
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| def sameAsScalaHashing(implicit catsHash: Hash[A], scalaHashing: Hashing[A]): HashProperties = new HashProperties( | ||
| name = "sameAsScalaHashing", | ||
| parent = None, | ||
| "same-as-scala-hashing" -> forAll { (x: A, y: A) => | ||
| (catsHash.hash(x) == Hash.fromHashing(scalaHashing).hash(x)) && | ||
| (catsHash.eqv(x, y) == Hash.fromHashing(scalaHashing).eqv(x, y)) | ||
| } | ||
| ) | ||
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| class HashProperties(name: String, parent: Option[RuleSet], props: (String, Prop)*) | ||
| extends DefaultRuleSet(name, parent, props: _*) | ||
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| } |
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