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foldable.scala
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foldable.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.collections
package syntax
import cats.{Foldable, Order, Semigroup}
trait FoldableSyntax {
implicit def foldableSyntax[F[_]: Foldable, A](fa: F[A]): FoldableOps[F, A] =
new FoldableOps(fa)
}
final class FoldableOps[F[_], A](fa: F[A])(implicit F: Foldable[F]) {
def toCatsVector: Vector[A] =
F.foldLeft[A, Vector[A]](fa, Vector.empty)(_ :+ _)
def toCatsMap[K, V](implicit K: Order[K], ev: A =:= (K, V)): AvlMap[K, V] = {
F.foldLeft(fa, AvlMap.empty[K, V])(_ + _)
}
def toCatsMultiMap[K, V](implicit K: Order[K], ev: A =:= (K, V), V: Semigroup[V]): AvlMap[K, V] = {
F.foldLeft(fa, AvlMap.empty[K, V]) { (m, a) =>
val (k, v) = ev(a)
m.updateAppend(k, v)
}
}
}