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Strong.scala
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Strong.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
package arrow
/**
* Must obey the laws defined in cats.laws.StrongLaws.
*/
trait Strong[F[_, _]] extends Profunctor[F] {
/**
* Create a new `F` that takes two inputs, but only modifies the first input
*
* Example:
* {{{
* scala> import cats.syntax.all._
* scala> import cats.arrow.Strong
* scala> val f: Int => Int = _ * 2
* scala> val fab = Strong[Function1].first[Int,Int,Int](f)
* scala> fab((2,3))
* res0: (Int, Int) = (4,3)
* }}}
*/
def first[A, B, C](fa: F[A, B]): F[(A, C), (B, C)]
/**
* Create a new `F` that takes two inputs, but only modifies the second input
*
* Example:
* {{{
* scala> import cats.syntax.all._
* scala> import cats.arrow.Strong
* scala> val f: Int => Int = _ * 2
* scala> val fab = Strong[Function1].second[Int,Int,Int](f)
* scala> fab((2,3))
* res0: (Int, Int) = (2,6)
* }}}
*/
def second[A, B, C](fa: F[A, B]): F[(C, A), (C, B)]
}
object Strong {
/**
* Summon an instance of [[Strong]] for `F`.
*/
@inline def apply[F[_, _]](implicit instance: Strong[F]): Strong[F] = instance
@deprecated("Use cats.syntax object imports", "2.2.0")
object ops {
implicit def toAllStrongOps[F[_, _], A, B](target: F[A, B])(implicit tc: Strong[F]): AllOps[F, A, B] {
type TypeClassType = Strong[F]
} =
new AllOps[F, A, B] {
type TypeClassType = Strong[F]
val self: F[A, B] = target
val typeClassInstance: TypeClassType = tc
}
}
trait Ops[F[_, _], A, B] extends Serializable {
type TypeClassType <: Strong[F]
def self: F[A, B]
val typeClassInstance: TypeClassType
def first[C]: F[(A, C), (B, C)] = typeClassInstance.first[A, B, C](self)
def second[C]: F[(C, A), (C, B)] = typeClassInstance.second[A, B, C](self)
}
trait AllOps[F[_, _], A, B] extends Ops[F, A, B] with Profunctor.AllOps[F, A, B] {
type TypeClassType <: Strong[F]
}
trait ToStrongOps extends Serializable {
implicit def toStrongOps[F[_, _], A, B](target: F[A, B])(implicit tc: Strong[F]): Ops[F, A, B] {
type TypeClassType = Strong[F]
} =
new Ops[F, A, B] {
type TypeClassType = Strong[F]
val self: F[A, B] = target
val typeClassInstance: TypeClassType = tc
}
}
@deprecated("Use cats.syntax object imports", "2.2.0")
object nonInheritedOps extends ToStrongOps
}