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BoundedSemilattice.scala
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BoundedSemilattice.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
import scala.{specialized => sp}
trait BoundedSemilattice[@sp(Int, Long, Float, Double) A] extends Any with Semilattice[A] with CommutativeMonoid[A] {
override def combineN(a: A, n: Int): A =
if (n < 0) throw new IllegalArgumentException("Repeated combining for monoids must have n >= 0")
else if (n == 0) empty
else a // combine(a, a) == a for a semilattice
}
object BoundedSemilattice extends SemilatticeFunctions[BoundedSemilattice] {
/**
* Access an implicit `BoundedSemilattice[A]`.
*/
@inline final def apply[@sp(Int, Long, Float, Double) A](implicit ev: BoundedSemilattice[A]): BoundedSemilattice[A] =
ev
/**
* Create a `BoundedSemilattice` instance from the given function and empty value.
*/
@inline def instance[A](emptyValue: A, cmb: (A, A) => A): BoundedSemilattice[A] =
new BoundedSemilattice[A] {
override val empty: A = emptyValue
override def combine(x: A, y: A): A = cmb(x, y)
}
}