enclosure_deleter.h
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00001 /*********************************************************************
00002 *
00003 * Software License Agreement (BSD License)
00004 *
00005 *  Copyright (c) 2008, Willow Garage, Inc.
00006 *  All rights reserved.
00007 *
00008 *  Redistribution and use in source and binary forms, with or without
00009 *  modification, are permitted provided that the following conditions
00010 *  are met:
00011 *
00012 *   * Redistributions of source code must retain the above copyright
00013 *     notice, this list of conditions and the following disclaimer.
00014 *   * Redistributions in binary form must reproduce the above
00015 *     copyright notice, this list of conditions and the following
00016 *     disclaimer in the documentation and/or other materials provided
00017 *     with the distribution.
00018 *   * Neither the name of Willow Garage, Inc. nor the names of its
00019 *     contributors may be used to endorse or promote products derived
00020 *     from this software without specific prior written permission.
00021 *
00022 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00023 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00024 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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00034 *
00035 * Author: Eitan Marder-Eppstein
00036 *********************************************************************/
00037 
00038 #include <boost/shared_ptr.hpp>
00039 
00040 #ifndef ACTIONLIB_ENCLOSURE_DELETER_H_
00041 #define ACTIONLIB_ENCLOSURE_DELETER_H_
00042 
00043 namespace actionlib
00044 {
00045 
00046 /*
00047  * This allows the creation of a shared pointer to a section
00048  * of an already reference counted structure. For example,
00049  * if in the following picture Enclosure is reference counted with
00050  * a boost::shared_ptr and you want to return a boost::shared_ptr
00051  * to the Member that is referenced counted along with Enclosure objects
00052  *
00053  * Enclosure ---------------  <--- Already reference counted
00054  * -----Member <------- A member of enclosure objects, eg. Enclosure.Member
00055  */
00056 template <class Enclosure> class EnclosureDeleter {
00057   public:
00058     EnclosureDeleter(const boost::shared_ptr<Enclosure>& enc_ptr) : enc_ptr_(enc_ptr){}
00059 
00060     template<class Member> void operator()(Member* member_ptr){
00061       enc_ptr_.reset();
00062     }
00063 
00064   private:
00065     boost::shared_ptr<Enclosure> enc_ptr_;
00066 };
00067 
00068 template <class Enclosure, class Member>
00069 boost::shared_ptr<Member> share_member(boost::shared_ptr<Enclosure> enclosure, Member &member)
00070 {
00071   EnclosureDeleter<Enclosure> d(enclosure);
00072   boost::shared_ptr<Member> p(&member, d);
00073   return p;
00074 }
00075 
00076 }
00077 
00078 #endif


actionlib
Author(s): Eitan Marder-Eppstein, Vijay Pradeep
autogenerated on Sun Oct 5 2014 22:02:55