text: // Copyright (c) 2018, The Regents of the University of California
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are met:
  // * Redistributions of source code must retain the above copyright
  //   notice, this list of conditions and the following disclaimer.
  // * Redistributions in binary form must reproduce the above copyright
  //   notice, this list of conditions and the following disclaimer in the
  //   documentation and/or other materials provided with the distribution.
  // * Neither the name of the University of California nor the
  //   names of its contributors may be used to endorse or promote products
  //   derived from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
  // BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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  // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  // POSSIBILITY OF SUCH DAMAGE.
  
  #ifndef GOAL_ID_HASH_H
  #define GOAL_ID_HASH_H
  
  #include "actionlib_msgs/GoalID.h"
  
  bool operator==(
      const actionlib_msgs::GoalID& a, const actionlib_msgs::GoalID& b);
  
  namespace std {
  
  template<> struct equal_to<actionlib_msgs::GoalID> {
    bool operator()(const actionlib_msgs::GoalID&, const actionlib_msgs::GoalID&)
      const;
  };
  
  template<> struct hash<actionlib_msgs::GoalID> {
    size_t operator()(const actionlib_msgs::GoalID& goal_id) const;
  };
  
  }  // namespace std
  
  #endif  // GOAL_ID_HASH_H
  