/
NonEmptyAlternative.scala
94 lines (85 loc) · 3.42 KB
/
NonEmptyAlternative.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
trait NonEmptyAlternative[F[_]] extends Applicative[F] with SemigroupK[F] { self =>
/**
* Lift `a` into `F[_]` and prepend it to `fa`.
*
* Example:
* {{{
* scala> NonEmptyAlternative[List].prependK(1, List(2, 3, 4))
* res0: List[Int] = List(1, 2, 3, 4)
* }}}
*/
def prependK[A](a: A, fa: F[A]): F[A] = combineK(pure(a), fa)
/**
* Lift `a` into `F[_]` and append it to `fa`.
*
* Example:
* {{{
* scala> NonEmptyAlternative[List].appendK(List(1, 2, 3), 4)
* res0: List[Int] = List(1, 2, 3, 4)
* }}}
*/
def appendK[A](fa: F[A], a: A): F[A] = combineK(fa, pure(a))
override def compose[G[_]: Applicative]: NonEmptyAlternative[λ[α => F[G[α]]]] =
new ComposedNonEmptyAlternative[F, G] {
val F = self
val G = Applicative[G]
}
}
object NonEmptyAlternative {
/**
* Summon an instance of [[NonEmptyAlternative]] for `F`.
*/
@inline def apply[F[_]](implicit instance: NonEmptyAlternative[F]): NonEmptyAlternative[F] = instance
@deprecated("Use cats.syntax object imports", "2.2.0")
object ops {
implicit def toAllNonEmptyAlternativeOps[F[_], A](target: F[A])(implicit tc: NonEmptyAlternative[F]): AllOps[F, A] {
type TypeClassType = NonEmptyAlternative[F]
} = new AllOps[F, A] {
type TypeClassType = NonEmptyAlternative[F]
val self: F[A] = target
val typeClassInstance: TypeClassType = tc
}
}
trait Ops[F[_], A] extends Serializable {
type TypeClassType <: NonEmptyAlternative[F]
def self: F[A]
val typeClassInstance: TypeClassType
def prependK(a: A): F[A] = typeClassInstance.prependK[A](a, self)
def appendK(a: A): F[A] = typeClassInstance.appendK[A](self, a)
}
trait AllOps[F[_], A] extends Ops[F, A] with Applicative.AllOps[F, A] with SemigroupK.AllOps[F, A] {
type TypeClassType <: NonEmptyAlternative[F]
}
trait ToNonEmptyAlternativeOps extends Serializable {
implicit def toNonEmptyAlternativeOps[F[_], A](target: F[A])(implicit tc: NonEmptyAlternative[F]): Ops[F, A] {
type TypeClassType = NonEmptyAlternative[F]
} = new Ops[F, A] {
type TypeClassType = NonEmptyAlternative[F]
val self: F[A] = target
val typeClassInstance: TypeClassType = tc
}
}
@deprecated("Use cats.syntax object imports", "2.2.0")
object nonInheritedOps extends ToNonEmptyAlternativeOps
}