content: /*
   * Copyright 2021 Alibaba Group Holding Limited.
   *
   * 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.alibaba.graphscope.ds;
  
  import static com.alibaba.graphscope.utils.CppClassName.GRAPE_ADJ_LIST;
  import static com.alibaba.graphscope.utils.CppHeaderName.GRAPE_ADJ_LIST_H;
  import static com.alibaba.graphscope.utils.CppHeaderName.GRAPE_TYPES_H;
  
  import com.alibaba.fastffi.CXXHead;
  import com.alibaba.fastffi.CXXPointer;
  import com.alibaba.fastffi.CXXPointerRange;
  import com.alibaba.fastffi.FFIGen;
  import com.alibaba.fastffi.FFINameAlias;
  import com.alibaba.fastffi.FFIPointer;
  import com.alibaba.fastffi.FFITypeAlias;
  
  /**
   * AdjList is the data structure representing the edges(destination vertex and edge data) of a
   * single vertex. The edges are representing in form of {@link GrapeNbr}.
   *
   * <p>This is a wrapper for <a
   * href="https://github.com/alibaba/libgrape-lite/blob/master/grape/graph/adj_list.h">C++ AdjList
   * class</a>
   */
  @FFIGen
  @CXXHead({GRAPE_ADJ_LIST_H, GRAPE_TYPES_H})
  @FFITypeAlias(GRAPE_ADJ_LIST)
  public interface GrapeAdjList<VID_T, EDATA_T>
          extends FFIPointer, CXXPointer, CXXPointerRange<GrapeNbr<VID_T, EDATA_T>> {
      /**
       * Get the begin Nbr.
       *
       * @return the first Nbr.
       */
      default GrapeNbr<VID_T, EDATA_T> begin() {
          return begin_pointer();
      }
      /**
       * Get the last Nbr.
       *
       * @return the last Nbr.
       */
      default GrapeNbr<VID_T, EDATA_T> end() {
          return end_pointer();
      }
  
      /**
       * Get the begin Nbr.
       *
       * @return the first Nbr.
       */
      GrapeNbr<VID_T, EDATA_T> begin_pointer();
  
      /**
       * Get the last Nbr.
       *
       * @return the last Nbr.
       */
      GrapeNbr<VID_T, EDATA_T> end_pointer();
  
      /**
       * Get the size of this adjList.
       *
       * @return size
       */
      @FFINameAlias("Size")
      long size();
  }
  