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BoundedJoinSemilattice.scala
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BoundedJoinSemilattice.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 algebra
package lattice
import scala.{specialized => sp}
trait BoundedJoinSemilattice[@sp(Int, Long, Float, Double) A] extends Any with JoinSemilattice[A] {
def zero: A
def isZero(a: A)(implicit ev: Eq[A]): Boolean = ev.eqv(a, zero)
override def joinSemilattice: BoundedSemilattice[A] =
new BoundedSemilattice[A] {
def empty: A = zero
def combine(x: A, y: A): A = join(x, y)
}
}
trait BoundedJoinSemilatticeFunctions[B[A] <: BoundedJoinSemilattice[A]] extends JoinSemilatticeFunctions[B] {
def zero[@sp(Int, Long, Float, Double) A](implicit ev: B[A]): A = ev.zero
}
object BoundedJoinSemilattice
extends JoinSemilatticeFunctions[BoundedJoinSemilattice]
with BoundedJoinSemilatticeFunctions[BoundedJoinSemilattice] {
/**
* Access an implicit `BoundedJoinSemilattice[A]`.
*/
@inline final def apply[@sp(Int, Long, Float, Double) A](implicit
ev: BoundedJoinSemilattice[A]
): BoundedJoinSemilattice[A] = ev
}