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Copy pathset.scala
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44 lines (37 loc) · 1.67 KB
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/*
* Copyright (c) 2016 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 mouse
import cats.data.NonEmptySet
import mouse.compat.SortedSet
trait SetSyntax {
implicit final def setSyntaxMouse[A](set: Set[A]): SetOps[A] = new SetOps[A](set)
}
final class SetOps[A](private val sa: Set[A]) extends AnyVal {
/**
* A safe counterpart to `Set.tail` that returns empty `Set[A]` for an empty set.
*/
@inline def tailOrEmpty: Set[A] = sa.drop(1)
/**
* Returns `Some` if the tail is non-empty, otherwise `None`.
*/
@inline def tailOption(implicit ordering: Ordering[A]): Option[NonEmptySet[A]] =
NonEmptySet.fromSet(SortedSet.from(tailOrEmpty))
}