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list.scala
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list.scala
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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.NonEmptyList
trait ListSyntax {
implicit final def listSyntaxMouse[A](list: List[A]): ListOps[A] = new ListOps[A](list)
}
final class ListOps[A](private val list: List[A]) extends AnyVal {
/**
* A safe counterpart to `List.tail` that returns `Nil` for an empty list.
*/
@inline def tailOrEmpty: List[A] = list.drop(1)
/**
* Returns `Some` if the tail is non-empty, otherwise `None`.
*/
@inline def tailOption: Option[NonEmptyList[A]] = NonEmptyList.fromList(list.drop(1))
}