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• ShortInstances.scala

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cats.kernel.instances.ShortInstances.scala Maven / Gradle / Ivy

package cats.kernel
package instances

trait ShortInstances {
  implicit val catsKernelStdOrderForShort
    : Order[Short] with Hash[Short] with LowerBounded[Short] with UpperBounded[Short] = new ShortOrder
  implicit val catsKernelStdGroupForShort: CommutativeGroup[Short] = new ShortGroup
}

class ShortGroup extends CommutativeGroup[Short] {
  def combine(x: Short, y: Short): Short = (x + y).toShort
  def empty: Short = 0
  def inverse(x: Short): Short = (-x).toShort
  override def remove(x: Short, y: Short): Short = (x - y).toShort
}

trait ShortBounded extends LowerBounded[Short] with UpperBounded[Short] {
  override def minBound: Short = Short.MinValue
  override def maxBound: Short = Short.MaxValue
}

class ShortOrder extends Order[Short] with Hash[Short] with ShortBounded { self =>

  def hash(x: Short): Int = x.hashCode()
  // use java.lang.Short.compare if we can rely on java >= 1.7
  def compare(x: Short, y: Short): Int =
    if (x < y) -1 else if (x > y) 1 else 0

  override def eqv(x: Short, y: Short): Boolean = x == y
  override def neqv(x: Short, y: Short): Boolean = x != y
  override def gt(x: Short, y: Short): Boolean = x > y
  override def gteqv(x: Short, y: Short): Boolean = x >= y
  override def lt(x: Short, y: Short): Boolean = x < y
  override def lteqv(x: Short, y: Short): Boolean = x <= y

  override def min(x: Short, y: Short): Short =
    java.lang.Math.min(x.toInt, y.toInt).toShort
  override def max(x: Short, y: Short): Short =
    java.lang.Math.max(x.toInt, y.toInt).toShort

  override val partialOrder: PartialOrder[Short] = self
}