com.mware.ge.cypher.internal.util.helpers.fixedPoint.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) 2013-2020 "BigConnect,"
 * MWARE SOLUTIONS SRL
 *
 * Copyright (c) 2002-2020 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * 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 com.mware.ge.cypher.internal.util.helpers

import scala.annotation.tailrec

object fixedPoint {

  def apply[A](f: A => A): A => A = inner(f, _)

  @tailrec
  private def inner[A](f: A => A, that: A): A = {
    val t = f(that)
    if (t == that)
      t
    else
      inner(f, t)
  }
}