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InjectLaws.scala
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InjectLaws.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 laws
trait InjectLaws[A, B] {
def inject: Inject[A, B]
def injectRoundTripInj(a: A): IsEq[Option[A]] =
inject.prj.compose(inject.inj).apply(a) <-> Some(a)
def injectRoundTripPrj(b: B): IsEq[Option[B]] =
inject.prj(b) match {
case Some(a) => (Some(inject.inj(a)): Option[B]) <-> Some(b)
case None => (None: Option[B]) <-> None
}
}
object InjectLaws {
def apply[A, B](implicit ev: Inject[A, B]): InjectLaws[A, B] =
new InjectLaws[A, B] { val inject: Inject[A, B] = ev }
}