text: #ifndef COS_GEN_MAP_H
  #define COS_GEN_MAP_H
  
  /**
   * C Object System
   * COS generics for map
   *
   * Copyright 2015+ ZhuYaDong <aeix@foxmail.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.
   */
  
  #include <cos/Object.h>
  
  defgeneric(OBJ, gkeyIterator, _1);
  defgeneric(OBJ, gvalIterator, _1);
  defgeneric(OBJ, gkeysForVal,  _1, val); // all keys that mapto val
  defgeneric(OBJ, gallKeys,     _1);
  defgeneric(OBJ, gallVals,     _1);
  
  #endif // COS_GEN_MAP_H
  