quasar.physical.mongodb.workflow.Coalesce.scala Maven / Gradle / Ivy

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/*
 * Copyright 2014–2017 SlamData Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package quasar.physical.mongodb.workflow

import slamdata.Predef._

import matryoshka._
import matryoshka.data.Fix
import simulacrum.typeclass

@typeclass trait Coalesce[F[_]] {
  def coalesceƒ: F[Fix[F]] => Option[F[Fix[F]]]

  def coalesce: F[Fix[F]] => F[Fix[F]] = repeatedly(coalesceƒ)
}