enclosure_deleter.h
Go to the documentation of this file.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 00025 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 00026 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00027 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00028 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00029 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 00030 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00031 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 00032 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00033 * POSSIBILITY OF SUCH DAMAGE. 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