104 lines
1.7 KiB
C++
104 lines
1.7 KiB
C++
//-----------------------------------------------------------------------------+
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// Copyright (C), 1998-2007, SH Software Co. Ltd.
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// = FileName : SafeResource.cpp
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// = Version : ver2.0
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// = Author : zjq
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// = CreateDate : 2002-09-09
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// = Description: 类的定义
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// = Maintainers:
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//
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//-----------------------------------------------------------------------------+
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#include "StdAfx.h"
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#include "SafeResource.h"
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SafeResource::SafeResource()
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{
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pReferCount = new int(1);
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}
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void SafeResource::Attach(SafeResource&source)
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{
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Detach();
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if(source.IsAttached())
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{
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pReferCount=source.pReferCount;
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Apply(source);
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IncreaseRef();
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}
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}
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SafeResource::SafeResource(SafeResource&source)//获取资源
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{
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Attach(source);
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}
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SafeResource& SafeResource::operator=(SafeResource&source)
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{
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//只要不是自身赋值，则获取资源
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//防止自身赋值时引用计数错误增大。
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if ((&source) != this)
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{
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Attach(source);
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}
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return *this;
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}
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void SafeResource::Detach()
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{
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//＜放弃资源＞
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//如是资源的最后一个用户，释放资源。
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//如果资源为空，则不进行任何操作。
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//多次调用完全等同于一次调用。
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if(IsAttached())
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{
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DecreaseRef();
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if(CanRelease())
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{
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Release();
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delete pReferCount;
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}
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pReferCount=NULL;
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}
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}
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SafeResource::~SafeResource()
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{
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//如果子类重载了Apply或者Release,则其析构函数必须调用Detach。
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Detach();
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}
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void SafeResource::Apply(SafeResource&source)
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{
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}
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void SafeResource::Release()
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{
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}
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void SafeResource::IncreaseRef()
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{
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(*pReferCount)++;
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}
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void SafeResource::DecreaseRef()
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{
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(*pReferCount)--;
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}
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bool SafeResource::CanRelease()
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{
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return (*pReferCount) == 0;
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}
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bool SafeResource::IsLastRefer()
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{
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return (*pReferCount) == 1;
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}
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bool SafeResource::IsAttached()
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{
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return pReferCount != NULL;
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}
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