110 lines
2.6 KiB
C++
110 lines
2.6 KiB
C++
//
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// auto_rel.h
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//
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#pragma once
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// class I - Multi-Inheritance casting for ATL type classes
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// ergo C2385 - T::Release() is ambiguous
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//
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template<class T, class I = T>
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class auto_rel
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{
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public:
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explicit auto_rel(T* p = 0)
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: pointee(p) {};
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// Don't AddRef()
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auto_rel(auto_rel<T,I>& rhs)
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: pointee(rhs.get()) { if (pointee) ((I*)pointee)->AddRef(); }
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~auto_rel()
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{
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if (pointee)
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((I*)pointee)->Release();
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};
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auto_rel<T,I>& operator= (const auto_rel<T,I>& rhs)
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{
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if (this != rhs.getThis())
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{
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reset (rhs.get());
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if (pointee) ((I*)pointee)->AddRef();
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}
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return *this;
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};
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auto_rel<T,I>& operator= (T*rhs)
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{
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reset (rhs);
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// Don't AddRef()
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return *this;
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};
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T& operator*() const
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{ return *pointee; };
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T* operator-> () const
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{ return pointee; };
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T** operator& () // for OpenEntry etc...
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{ reset(); return &pointee; };
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operator T* ()
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{ return pointee; };
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#ifdef MAPIDEFS_H
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operator LPMAPIPROP ()
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{ return (LPMAPIPROP)pointee; };
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#endif
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operator bool ()
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{ return pointee != NULL; };
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operator bool () const
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{ return pointee != NULL; };
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bool operator! ()
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{ return pointee == NULL; };
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bool operator! () const
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{ return pointee == NULL; };
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// Checks for NULL
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bool operator== (LPVOID lpv)
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{ return pointee == lpv; };
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bool operator!= (LPVOID lpv)
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{ return pointee != lpv; };
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bool operator== (const auto_rel<T,I>& rhs)
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{ return pointee == rhs.pointee; }
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bool operator< (const auto_rel<T,I>& rhs)
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{ return pointee < rhs.pointee; }
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// return value of current dumb pointer
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T* get() const
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{ return pointee; };
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// relinquish ownership
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T* release()
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{ T * oldPointee = pointee;
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pointee = 0;
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return oldPointee;
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};
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// delete owned pointer; assume ownership of p
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ULONG reset (T* p = 0)
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{ ULONG ul = 0;
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if (pointee)
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ul = ((I*)pointee)->Release();
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pointee = p;
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return ul;
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};
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private:
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#ifdef MAPIDEFS_H
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// these are here on purpose, better to find out at compile time
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// use auto_padr<T,I> or auto_prow<T,I>
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operator LPADRLIST () { return 0; };
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operator LPSRowSet () { return 0; };
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#endif
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// operator& throws off operator=
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const auto_rel<T,I> * getThis() const
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{ return this; };
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T* pointee;
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};
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