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MCRefCount.h

00001 #if !defined(__MCREFCOUNT_H_)
00002 #define __MCREFCOUNT_H_
00003 
00004 #ident "@(#)$Id: MCRefCount.h,v 1.7 2004/12/02 07:05:20 mike Exp $"
00005 
00006 /*
00007  * Copyright Miba Consulting Ltd. (c) 2000-2003
00008  * 
00009  * This library is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  * 
00014  * This library is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00017  * Lesser General Public License for more details.
00018  * 
00019  * You should have received a copy of the GNU Lesser General Public
00020  * License along with this library; if not, write to the Free Software
00021  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
00022  *
00023  */
00024 
00025 #include "mcllib/MCTypes.h"
00026 #include "mcllib/MCTypeTraits.h"
00027 
00028 namespace mcllib
00029 {
00030     class MCRefCountAccessorBase;
00031 
00041     class MCRefCount
00042     {
00043     public:
00045         MCRefCount();
00047         MCRefCount(const MCRefCount& rc);
00049         MCRefCount& operator=(const MCRefCount& rc);
00051         ~MCRefCount();
00052     private:
00054         mcatomic_t m_cnt;
00056         friend class MCRefCountAccessorBase;
00057     };
00058 
00065     template<typename T>
00066     class MCRefCountWrap : public MCRefCount
00067     {
00068     private:
00069         typedef MCTypeTraits<T> traits;
00070         typedef typename traits::copy_param_type copy_param_type;
00071         typedef typename traits::copy_return_type copy_return_type;
00072     public:
00074         MCRefCountWrap();
00076         MCRefCountWrap(copy_param_type data)
00077             : m_data(data)
00078         {
00079         }
00081         inline operator T&()
00082         {
00083             return(m_data);
00084         }
00085     private:
00086         T m_data;
00087     };
00088 
00089     // This is here (rather than in the template itself)
00090     // because the wrapped class might not have a default
00091     // constructor
00092     template<typename T>
00093     MCRefCountWrap<T>::MCRefCountWrap()
00094     {
00095     }
00096 
00097 };
00098 
00099 #endif

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