content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 accord.utils;
  
  public interface IndexedFoldIntersectToLong<P1>
  {
      /**
       * Apply some long->long merge function accepting a constant object parameter p1, a long parameter p2, and the prior
       * output of this function or the initial value, to some element occurring in two collections, with each collection's
       * index for the element provided as the final parameters.
       *
       * This function is used for folding over the common elements of two sorted collections.
       */
      long apply(P1 p1, long p2, long accumulate, int leftIndex, int rightIndex);
  }
  