1 /*

        2  * 参照カウント

        3  * $Issei$

        4  *

        5  * Copyright (c) 2006

        6  *    Issei Suzuki <issei@issei.org>   All rights reserved.

        7  *

        8  * Permission is hereby granted, free of charge, to any person obtaining a

        9  * copy of this software and associated documentation files (the "Software"),

       10  * to deal in the Software without restriction, including without limitation

       11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,

       12  * and/or sell copies of the Software, and to permit persons to whom the

       13  * Software is furnished to do so, subject to the following conditions:

       14  *

       15  * The above copyright notice and this permission notice shall be included

       16  * in all copies or substantial portions of the Software.

       17  *

       18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

       19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

       20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

       21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

       22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

       23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

       24  * DEALINGS IN THE SOFTWARE.

       25  */

       26 

       27 #pragma once

       28 

       29 #define REF_COUNT_DECL(_class)											\

       30 	virtual void addRef() = 0;											\

       31 	virtual void release() = 0;											\

       32 																		\

       33 	friend void intrusive_ptr_add_ref(_class* p) { p->addRef(); }		\

       34 	friend void intrusive_ptr_release(_class* p) { p->release(); }

       35 

       36 #define REF_COUNT_IMPL(_class)											\

       37 private:																\

       38 	RefCounter m_ref_count;												\

       39 																		\

       40 	virtual void addRef() { m_ref_count.inc(); }						\

       41 	virtual void release() { if (m_ref_count.dec() == 0) delete this; }	\

       42 																		\

       43 	friend void intrusive_ptr_add_ref(_class* p) { p->addRef(); }		\

       44 	friend void intrusive_ptr_release(_class* p) { p->release(); }

       45 

       46 class RefCounter

       47 {

       48 public:

       49 	RefCounter() : m_count(1) {}

       50 	int inc() { return ++m_count; }

       51 	int dec() { dbAbort(m_count > 0, _T("negative refcount")); return --m_count; }

       52 	operator int() { return m_count; }

       53 

       54 private:

       55 	int m_count;

       56 };