convert.h

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// Copyright 2013, Open Source Robotics Foundation, Inc. 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 Open Source Robotics Foundation 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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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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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);
}
 
}  // namespace impl
}  // namespace tf2
 
#endif  // TF2__IMPL__CONVERT_H_