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Xor.scala
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Xor.scala
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/*
* Copyright 2016 Jasper Moeys
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package implicitlogic
sealed trait Xor[A,B] {
def result: Either[A,B]
override def toString = s"Xor($result)"
override def equals(that: Any) = that match {
case xor: Xor[_,_] => result.equals(xor.result)
case _ => false
}
override def hashCode = 13 * 7 + result.hashCode
}
object Xor {
private def apply[A,B](ab: Either[A,B]) = new Xor[A,B] {
val result = ab
}
implicit def makeXor[A,B](implicit ev : (A || B) && ![A && B]): Xor[A,B] = {
val (or, _) = ev.result
Xor(or.result)
}
}