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IntInstances.scala
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IntInstances.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.kernel
package instances
trait IntInstances {
implicit val catsKernelStdOrderForInt: Order[Int] with Hash[Int] with BoundedEnumerable[Int] =
new IntOrder
implicit val catsKernelStdGroupForInt: CommutativeGroup[Int] = new IntGroup
}
class IntGroup extends CommutativeGroup[Int] {
def combine(x: Int, y: Int): Int = x + y
def empty: Int = 0
def inverse(x: Int): Int = -x
override def remove(x: Int, y: Int): Int = x - y
}
trait IntEnumerable extends BoundedEnumerable[Int] {
override def partialNext(a: Int): Option[Int] =
if (order.eqv(a, maxBound)) None else Some(a + 1)
override def partialPrevious(a: Int): Option[Int] =
if (order.eqv(a, minBound)) None else Some(a - 1)
}
trait IntBounded extends LowerBounded[Int] with UpperBounded[Int] {
override def minBound: Int = Int.MinValue
override def maxBound: Int = Int.MaxValue
}
class IntOrder extends Order[Int] with Hash[Int] with IntBounded with IntEnumerable { self =>
def hash(x: Int): Int = x.hashCode()
def compare(x: Int, y: Int): Int =
if (x < y) -1 else if (x > y) 1 else 0
override def eqv(x: Int, y: Int): Boolean = x == y
override def neqv(x: Int, y: Int): Boolean = x != y
override def gt(x: Int, y: Int): Boolean = x > y
override def gteqv(x: Int, y: Int): Boolean = x >= y
override def lt(x: Int, y: Int): Boolean = x < y
override def lteqv(x: Int, y: Int): Boolean = x <= y
override def min(x: Int, y: Int): Int =
java.lang.Math.min(x, y)
override def max(x: Int, y: Int): Int =
java.lang.Math.max(x, y)
override val order: Order[Int] = self
}