111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
//
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// auto_h.h
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//
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#pragma once
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template<class T> class auto_handle;
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template<class T>
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class CHandleProxy
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{
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public:
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CHandleProxy (auto_handle<T>& ah) :
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m_ah(ah) {};
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CHandleProxy (const auto_handle<T>& ah) :
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m_ah(const_cast<auto_handle<T>&> (ah)) {};
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operator T* () { return &m_ah.h; }
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operator const T* () const { return &m_ah.h; }
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operator auto_handle<T>* () { return &m_ah; }
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protected:
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mutable auto_handle<T>& m_ah;
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};
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template<class T>
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class auto_handle
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{
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public:
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auto_handle(T p = 0)
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: h(p) {};
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auto_handle(const auto_handle<T>& rhs)
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: h(rhs.release()) {};
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~auto_handle()
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{ if (h && INVALID_HANDLE_VALUE != h) CloseHandle(h); };
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auto_handle<T>& operator= (const auto_handle<T>& rhs)
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{ if (this != rhs.getThis())
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reset (rhs.release() );
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return *this;
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};
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auto_handle<T>& operator= (HANDLE rhs)
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{ if ((NULL == rhs) || (INVALID_HANDLE_VALUE == rhs))
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{
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AssertSz(false, "assigning invalid HANDLE to auto_handle- use .reset instead");
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// be sure and go through auto_os for dbg.lib
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//auto_os os;
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//os = (BOOL)FALSE;
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//AssertSz(FALSE, "auto_handle<T>::op= Shouldn't ever get here");
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}
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reset (rhs);
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return *this;
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};
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CHandleProxy<T> operator& ()
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{ reset(); return CHandleProxy<T> (*this); }; // &h;
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const CHandleProxy<T> operator& () const
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{ return CHandleProxy<T> (*this); }; // &h;
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operator T ()
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{ return h; };
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// Checks for NULL
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bool operator! ()
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{ return h == NULL; }
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operator bool()
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{ return h != NULL; }
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bool operator== (LPVOID lpv) const
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{ return h == lpv; };
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bool operator!= (LPVOID lpv) const
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{ return h != lpv; };
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bool operator== (const auto_handle<T>& rhs) const
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{ return h == rhs.h; };
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bool operator< (const auto_handle<T>& rhs) const
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{ return h < rhs.h; };
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// return value of current dumb pointer
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T get() const
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{ return h; };
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// relinquish ownership
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T release() const
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{ T oldh = h;
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h = 0;
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return oldh;
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};
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// delete owned pointer; assume ownership of p
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BOOL reset (T p = 0)
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{
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BOOL rt = TRUE;
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if (h && INVALID_HANDLE_VALUE != h)
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rt = CloseHandle(h);
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h = p;
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return rt;
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};
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private:
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friend class CHandleProxy<T>;
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// operator& throws off operator=
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const auto_handle<T> * getThis() const
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{ return this; };
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// mutable is needed for release call in ctor and copy ctor
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mutable T h;
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};
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