/usr/share/cruisecontrol-bin-2.6.1/projects/qpid-trunk/cpp/src/qpid/RefCounted.h

00001 #ifndef QPID_REFCOUNTED_H
00002 #define QPID_REFCOUNTED_H
00003 
00004 /*
00005  *
00006  * Licensed to the Apache Software Foundation (ASF) under one
00007  * or more contributor license agreements.  See the NOTICE file
00008  * distributed with this work for additional information
00009  * regarding copyright ownership.  The ASF licenses this file
00010  * to you under the Apache License, Version 2.0 (the
00011  * "License"); you may not use this file except in compliance
00012  * with the License.  You may obtain a copy of the License at
00013  *
00014  *   http://www.apache.org/licenses/LICENSE-2.0
00015  *
00016  * Unless required by applicable law or agreed to in writing,
00017  * software distributed under the License is distributed on an
00018  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
00019  * KIND, either express or implied.  See the License for the
00020  * specific language governing permissions and limitations
00021  * under the License.
00022  *
00023  */
00024 
00025 #include <boost/utility.hpp>
00026 #include <boost/detail/atomic_count.hpp>
00027 
00028 namespace qpid {
00029 
00036 class RefCounted : boost::noncopyable {
00037     mutable boost::detail::atomic_count count;
00038 
00039 public:
00040     RefCounted() : count(0) {}
00041     void addRef() const { ++count; }
00042     void release() const { if (--count==0) delete this; }
00043     long refCount() { return count; }
00044 
00045 protected:
00046     virtual ~RefCounted() {};
00047 };
00048 
00056 struct RefCountedChild {
00057     RefCounted& parent;
00058 
00059 protected:
00060     RefCountedChild(RefCounted& parent_) : parent(parent_) {}
00061 
00062 public:
00063     void addRef() const { parent.addRef(); }
00064     void release() const { parent.release(); }
00065 };
00066 
00067 } // namespace qpid
00068 
00069 // intrusive_ptr support.
00070 namespace boost {
00071 inline void intrusive_ptr_add_ref(const qpid::RefCounted* p) { p->addRef(); }
00072 inline void intrusive_ptr_release(const qpid::RefCounted* p) { p->release(); }
00073 inline void intrusive_ptr_add_ref(const qpid::RefCountedChild* p) { p->addRef(); }
00074 inline void intrusive_ptr_release(const qpid::RefCountedChild* p) { p->release(); }
00075 }
00076 
00077 
00078 #endif  

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