convert.h

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/*
 * Copyright (c) 2013, Open Source Robotics Foundation
 * 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 Willow Garage, Inc. 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
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 */
 
#ifndef TF2_IMPL_CONVERT_H
#define TF2_IMPL_CONVERT_H
 
namespace tf2 {
namespace impl {
 
template <bool IS_MESSAGE_A, bool IS_MESSAGE_B>
class Converter {
public:
  template<typename A, typename B>
  static void convert(const A& a, B& b);
};
 
// The case where both A and B are messages should not happen: if you have two
// messages that are interchangeable, well, that's against the ROS purpose:
// only use one type. Worst comes to worst, specialize the original convert
// function for your types.
// if B == A, the templated version of convert with only one argument will be
// used.
//
template <>
template <typename A, typename B>
inline void Converter<true, true>::convert(const A& a, B& b);
 
template <>
template <typename A, typename B>
inline void Converter<true, false>::convert(const A& a, B& b)
{
  fromMsg(a, b);
}
 
template <>
template <typename A, typename B>
inline void Converter<false, true>::convert(const A& a, B& b)
{
  b = toMsg(a);
}
 
template <>
template <typename A, typename B>
inline void Converter<false, false>::convert(const A& a, B& b)
{
  fromMsg(toMsg(a), b);
}
 
}
}
 
#endif //TF2_IMPL_CONVERT_H