types.hpp

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// Copyright 2018 Open Source Robotics Foundation, Inc.
//
// 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.
 
#ifndef RCLCPP_ACTION__TYPES_HPP_
#define RCLCPP_ACTION__TYPES_HPP_
 
#include <rcl_action/types.h>
 
#include <action_msgs/msg/goal_status.hpp>
#include <action_msgs/msg/goal_info.hpp>
 
#include <climits>
#include <functional>
#include <string>
 
#include "rclcpp_action/visibility_control.hpp"
 
namespace rclcpp_action
{
 
using GoalUUID = std::array<uint8_t, UUID_SIZE>;
using GoalStatus = action_msgs::msg::GoalStatus;
using GoalInfo = action_msgs::msg::GoalInfo;
 
RCLCPP_ACTION_PUBLIC
std::string
to_string(const GoalUUID & goal_id);
 
// Convert C++ GoalID to rcl_action_goal_info_t
RCLCPP_ACTION_PUBLIC
void
convert(const GoalUUID & goal_id, rcl_action_goal_info_t * info);
 
// Convert rcl_action_goal_info_t to C++ GoalID
RCLCPP_ACTION_PUBLIC
void
convert(const rcl_action_goal_info_t & info, GoalUUID * goal_id);
}  // namespace rclcpp_action
 
namespace std
{
template<>
struct less<rclcpp_action::GoalUUID>
{
  bool operator()(
    const rclcpp_action::GoalUUID & lhs,
    const rclcpp_action::GoalUUID & rhs) const
  {
    return lhs < rhs;
  }
};
 
template<>
struct hash<rclcpp_action::GoalUUID>
{
  size_t operator()(const rclcpp_action::GoalUUID & uuid) const noexcept
  {
    // TODO(sloretz) Use someone else's hash function and cite it
    size_t result = 0;
    for (size_t i = 0; i < uuid.size(); ++i) {
      for (size_t b = 0; b < sizeof(size_t); ++b) {
        size_t part = uuid[i];
        part <<= CHAR_BIT * b;
        result ^= part;
      }
    }
    return result;
  }
};
}  // namespace std
#endif  // RCLCPP_ACTION__TYPES_HPP_