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EmptyK.scala
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EmptyK.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 alleycats
trait EmptyK[F[_]] extends Serializable { self =>
def empty[A]: F[A]
def synthesize[A]: Empty[F[A]] =
new Empty[F[A]] {
def empty: F[A] = self.empty[A]
}
}
object EmptyK extends EmptyKInstances0 {
/**
* Summon an instance of [[EmptyK]] for `F`.
*/
@inline def apply[F[_]](implicit instance: EmptyK[F]): EmptyK[F] = instance
@deprecated("Use cats.syntax object imports", "2.2.0")
object ops {
implicit def toAllEmptyKOps[F[_], A](target: F[A])(implicit tc: EmptyK[F]): AllOps[F, A] {
type TypeClassType = EmptyK[F]
} =
new AllOps[F, A] {
type TypeClassType = EmptyK[F]
val self: F[A] = target
val typeClassInstance: TypeClassType = tc
}
}
trait Ops[F[_], A] extends Serializable {
type TypeClassType <: EmptyK[F]
def self: F[A]
val typeClassInstance: TypeClassType
}
trait AllOps[F[_], A] extends Ops[F, A]
trait ToEmptyKOps extends Serializable {
implicit def toEmptyKOps[F[_], A](target: F[A])(implicit tc: EmptyK[F]): Ops[F, A] {
type TypeClassType = EmptyK[F]
} =
new Ops[F, A] {
type TypeClassType = EmptyK[F]
val self: F[A] = target
val typeClassInstance: TypeClassType = tc
}
}
@deprecated("Use cats.syntax object imports", "2.2.0")
object nonInheritedOps extends ToEmptyKOps
}
private[alleycats] trait EmptyKInstances0 {
implicit def alleycatsEmptyKForMap[K]: EmptyK[Map[K, *]] = alleycats.std.map.alletcatsStdMapEmptyK[K]
}