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InvariantSemigroupal.scala
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InvariantSemigroupal.scala
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/*
* Copyright (c) 2015 Typelevel
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package cats
/**
* [[InvariantSemigroupal]] is nothing more than something both invariant
* and Semigroupal. It comes up enough to be useful, and composes well
*/
trait InvariantSemigroupal[F[_]] extends Semigroupal[F] with Invariant[F] { self =>
def composeApply[G[_]: Apply]: InvariantSemigroupal[λ[α => F[G[α]]]] =
new ComposedInvariantApplySemigroupal[F, G] {
def F = self
def G = Apply[G]
}
}
object InvariantSemigroupal extends SemigroupalArityFunctions {
/**
* Gives a `Semigroup` instance if A itself has a `Semigroup` instance.
*/
def semigroup[F[_], A](implicit F: InvariantSemigroupal[F], A: Semigroup[A]): Semigroup[F[A]] =
new InvariantSemigroupalSemigroup[F, A](F, A)
/**
* Summon an instance of [[InvariantSemigroupal]] for `F`.
*/
@inline def apply[F[_]](implicit instance: InvariantSemigroupal[F]): InvariantSemigroupal[F] = instance
@deprecated("Use cats.syntax object imports", "2.2.0")
object ops {
implicit def toAllInvariantSemigroupalOps[F[_], A](
target: F[A]
)(implicit tc: InvariantSemigroupal[F]): AllOps[F, A] {
type TypeClassType = InvariantSemigroupal[F]
} =
new AllOps[F, A] {
type TypeClassType = InvariantSemigroupal[F]
val self: F[A] = target
val typeClassInstance: TypeClassType = tc
}
}
trait Ops[F[_], A] extends Serializable {
type TypeClassType <: InvariantSemigroupal[F]
def self: F[A]
val typeClassInstance: TypeClassType
}
trait AllOps[F[_], A] extends Ops[F, A] with Semigroupal.AllOps[F, A] with Invariant.AllOps[F, A] {
type TypeClassType <: InvariantSemigroupal[F]
}
trait ToInvariantSemigroupalOps extends Serializable {
implicit def toInvariantSemigroupalOps[F[_], A](target: F[A])(implicit tc: InvariantSemigroupal[F]): Ops[F, A] {
type TypeClassType = InvariantSemigroupal[F]
} =
new Ops[F, A] {
type TypeClassType = InvariantSemigroupal[F]
val self: F[A] = target
val typeClassInstance: TypeClassType = tc
}
}
@deprecated("Use cats.syntax object imports", "2.2.0")
object nonInheritedOps extends ToInvariantSemigroupalOps
}
private[cats] class InvariantSemigroupalSemigroup[F[_], A](f: InvariantSemigroupal[F], sg: Semigroup[A])
extends Semigroup[F[A]] {
def combine(a: F[A], b: F[A]): F[A] =
InvariantSemigroupal.imap2(a, b)(sg.combine)(a => (a, a))(f, f)
}