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 org.apache.causeway.commons.functional;
  
  import java.util.function.BiConsumer;
  import java.util.function.Consumer;
  
  import org.apache.causeway.commons.internal.base._Refs;
  
  /**
   * Similar to a {@link BiConsumer}, except that the first argument is an {@code int}.
   *
   * @since 2.x [@index}
   */
  @FunctionalInterface
  public interface IndexedConsumer<T> {
  
      // -- INTERFACE
  
      void accept(int index, T t);
  
      // -- UTILITY
  
      /**
       * Converts an {@link IndexedConsumer} into a {@link Consumer},
       * having its index start at {@code offset},
       * and incremented after each call.
       */
      static <T> Consumer<T> offset(final int offset, final IndexedConsumer<T> indexed){
          var indexRef = _Refs.intRef(offset);
          return t->indexed.accept(indexRef.getAndInc(), t);
      }
  
      /**
       * Converts an {@link IndexedConsumer} into a {@link Consumer},
       * having its index start at 0,
       * and incremented after each call.
       */
      static <T> Consumer<T> zeroBased(final IndexedConsumer<T> indexed){
          return offset(0, indexed);
      }
  
  }
  