intrusive_ptr.h

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00001 /*
00002  * Copyright (C) 2006-2010 Jacek Sieka, arnetheduck on gmail point com
00003  *
00004  * This program is free software; you can redistribute it and/or modify
00005  * it under the terms of the GNU General Public License as published by
00006  * the Free Software Foundation; either version 2 of the License, or
00007  * (at your option) any later version.
00008  *
00009  * This program is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  * GNU General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU General Public License
00015  * along with this program; if not, write to the Free Software
00016  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017  */
00018 
00019 #ifndef ADCHPP_INTRUSIVE_PTR_H
00020 #define ADCHPP_INTRUSIVE_PTR_H
00021 
00022 namespace std {
00023 
00024 template<typename T>
00025 struct hash<boost::intrusive_ptr<T> > {
00026     size_t operator()(const boost::intrusive_ptr<T>& t) const { return hash<T*>()(t.get()); }
00027 };
00028 
00029 }
00030 
00031 namespace adchpp {
00032 
00033 template<typename T>
00034 class intrusive_ptr_base
00035 {
00036 public:
00037     bool unique() throw() {
00038         return (refs == 1);
00039     }
00040 
00041     boost::intrusive_ptr<T> from_this() { return boost::intrusive_ptr<T>(static_cast<T*>(this)); }
00042 protected:
00043     intrusive_ptr_base() throw() : refs(0) { }
00044     ~intrusive_ptr_base() { }
00045 
00046 private:
00047     friend void intrusive_ptr_add_ref(T* p) {
00048         p->refs++;
00049     }
00050 
00051     friend void intrusive_ptr_release(T* p) {
00052         if(!--p->refs)
00053             delete p;
00054     }
00055 
00056     size_t refs;
00057 };
00058 
00059 }
00060 
00061 #endif
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