63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
#ifndef WCREFMANAGER_H
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#define WCREFMANAGER_H
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#define SAFE_RELEASE(p) if (p) {p->Release(); p = NULL;}
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//In order to use this interface, derive the Interface class
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//from WCRefManager_Interface and derive the implementation class
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//from WCRefManager_Impl. Further, in the implementation class
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//declaration, place the macro WCREFMANAGER_IMPL.
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class WCRefManager_Interface
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{
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public:
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/// Constructor.
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WCRefManager_Interface() {};
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/// Destructor.
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virtual ~WCRefManager_Interface() {};
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/// Adds a reference to class.
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virtual void AddRef() = 0;
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/// Decrements reference count and deletes the object if reference count becomes zero.
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virtual void Release() = 0;
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};
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///! See details at WCRefManager_Interface for how to use this.
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class WCRefManager_Impl
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{
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public:
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WCRefManager_Impl () : m_RefCount(1) {}
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virtual ~WCRefManager_Impl() {}
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protected:
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/// Variable to store reference count.
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unsigned int m_RefCount;
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/// Helper to put implementation in an interface derived class, don't forget to
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/// derive the impl from WCRefManager_Impl
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#define WCREFMAN_IMPL \
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public: \
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virtual void AddRef() {m_RefCount++;} \
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virtual void Release() {m_RefCount--; if (m_RefCount<=0) delete this;}
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};
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class WCRefManager
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{
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public:
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/// Construcotr.
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WCRefManager();
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/// Destructor.
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virtual ~WCRefManager();
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/// Adds a reference to class.
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void AddRef();
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/// Decrements reference count and deletes the object if reference count becomes zero.
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void Release();
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private:
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/// Variable to store reference count.
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unsigned int m_RefCount;
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};
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#endif // WCREFMANAGER_H
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