trait Invariant[F[_]] extends Serializable
Must obey the laws defined in cats.laws.InvariantLaws.
- Self Type
- Invariant[F]
- Source
- Invariant.scala
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- Invariant
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Abstract Value Members
- abstract def imap[A, B](fa: F[A])(f: (A) => B)(g: (B) => A): F[B]
Transform an
F[A]
into anF[B]
by providing a transformation fromA
toB
and one fromB
toA
.Transform an
F[A]
into anF[B]
by providing a transformation fromA
toB
and one fromB
toA
.Example:
scala> import cats.implicits._ scala> import scala.concurrent.duration._ scala> val durSemigroup: Semigroup[FiniteDuration] = | Invariant[Semigroup].imap(Semigroup[Long])(Duration.fromNanos)(_.toNanos) scala> durSemigroup.combine(2.seconds, 3.seconds) res1: FiniteDuration = 5 seconds
Concrete Value Members
- final def !=(arg0: Any): Boolean
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- final def ##: Int
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- final def ==(arg0: Any): Boolean
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- final def asInstanceOf[T0]: T0
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- def clone(): AnyRef
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- protected[lang]
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- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- def compose[G[_]](implicit arg0: Invariant[G]): Invariant[[α]F[G[α]]]
Compose Invariant
F[_]
andG[_]
then produceInvariant[F[G[_]]]
using theirimap
.Compose Invariant
F[_]
andG[_]
then produceInvariant[F[G[_]]]
using theirimap
.Example:
scala> import cats.implicits._ scala> import scala.concurrent.duration._ scala> val durSemigroupList: Semigroup[List[FiniteDuration]] = | Invariant[Semigroup].compose[List].imap(Semigroup[List[Long]])(Duration.fromNanos)(_.toNanos) scala> durSemigroupList.combine(List(2.seconds, 3.seconds), List(4.seconds)) res1: List[FiniteDuration] = List(2 seconds, 3 seconds, 4 seconds)
- def composeContravariant[G[_]](implicit arg0: Contravariant[G]): Invariant[[α]F[G[α]]]
Compose Invariant
F[_]
and ContravariantG[_]
then produceInvariant[F[G[_]]]
using F'simap
and G'scontramap
.Compose Invariant
F[_]
and ContravariantG[_]
then produceInvariant[F[G[_]]]
using F'simap
and G'scontramap
.Example:
scala> import cats.implicits._ scala> import scala.concurrent.duration._ scala> type ToInt[T] = T => Int scala> val durSemigroupToInt: Semigroup[ToInt[FiniteDuration]] = | Invariant[Semigroup] | .composeContravariant[ToInt] | .imap(Semigroup[ToInt[Long]])(Duration.fromNanos)(_.toNanos) // semantically equal to (2.seconds.toSeconds.toInt + 1) + (2.seconds.toSeconds.toInt * 2) = 7 scala> durSemigroupToInt.combine(_.toSeconds.toInt + 1, _.toSeconds.toInt * 2)(2.seconds) res1: Int = 7
- def composeFunctor[G[_]](implicit arg0: Functor[G]): Invariant[[α]F[G[α]]]
Compose Invariant
F[_]
and FunctorG[_]
then produceInvariant[F[G[_]]]
using F'simap
and G'smap
.Compose Invariant
F[_]
and FunctorG[_]
then produceInvariant[F[G[_]]]
using F'simap
and G'smap
.Example:
scala> import cats.implicits._ scala> import scala.concurrent.duration._ scala> val durSemigroupList: Semigroup[List[FiniteDuration]] = | Invariant[Semigroup] | .composeFunctor[List] | .imap(Semigroup[List[Long]])(Duration.fromNanos)(_.toNanos) scala> durSemigroupList.combine(List(2.seconds, 3.seconds), List(4.seconds)) res1: List[FiniteDuration] = List(2 seconds, 3 seconds, 4 seconds)
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