text: /*
   * Copyright (C) 2009, Willow Garage, Inc.
   *
   * 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 names of 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
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef ROSLIB_MESSAGE_FORWARD_H
  #define ROSLIB_MESSAGE_FORWARD_H
  
  // Make sure that either __GLIBCXX__ or _LIBCPP_VERSION is defined.
  #include <cstddef>
  
  // C++ standard section 17.4.3.1/1 states that forward declarations of STL types
  // that aren't specializations involving user defined types results in undefined
  // behavior. Apparently only libc++ has a problem with this and won't compile it.
  #ifndef _LIBCPP_VERSION
  namespace std
  {
  template<typename T> class allocator;
  }
  #else
  #include <memory>
  #endif
  
  namespace boost
  {
  template<typename T> class shared_ptr;
  }
  
  /**
   * \brief Forward-declare a message, including Ptr and ConstPtr types, with an allocator
   *
   * \param ns The namespace the message should be declared inside
   * \param m The "base" message type, i.e. the name of the .msg file
   * \param new_name The name you'd like the message to have
   * \param alloc The allocator to use, e.g. std::allocator
   */
  #define ROS_DECLARE_MESSAGE_WITH_ALLOCATOR(msg, new_name, alloc) \
    template<class Allocator> struct msg##_; \
    typedef msg##_<alloc<void> > new_name; \
    typedef boost::shared_ptr<new_name> new_name##Ptr; \
    typedef boost::shared_ptr<new_name const> new_name##ConstPtr;
  
  /**
   * \brief Forward-declare a message, including Ptr and ConstPtr types, using std::allocator
   * \param msg The "base" message type, i.e. the name of the .msg file
   */
  #define ROS_DECLARE_MESSAGE(msg) ROS_DECLARE_MESSAGE_WITH_ALLOCATOR(msg, msg, std::allocator)
  
  #endif // ROSLIB_MESSAGE_FORWARD_H
  