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RefCountedPtr.H

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00051 
00052 #ifndef _REFCOUNTEDPTR_H_
00053 #define _REFCOUNTEDPTR_H_
00054 
00055 #include "MayDay.H"
00056 
00058 
00101 template <class T>
00102 class RefCountedPtr {
00103 public:
00104   //
00105   inline RefCountedPtr(T* ptr = 0);
00106   //
00107   inline RefCountedPtr(const RefCountedPtr<T>& other);
00108   //
00109   inline ~RefCountedPtr();
00111 
00113   inline const RefCountedPtr<T>& operator =(const RefCountedPtr<T>& rhs);
00115   inline T* operator ->();
00116   inline const T* operator ->() const;
00117   //
00118   inline bool isNull() const;
00119   //
00121   inline T& operator *();
00122   inline const T& operator *() const;
00123   //
00125   inline operator const T* () const;
00126 
00128   inline bool isNonUnique() const;
00129 
00130   inline int refCount() const;
00131 
00132   inline void swap(RefCountedPtr<T>& b);
00133 
00134 protected:
00135   T* ptr_;
00136   int* refCount_;
00137 private:
00138 };
00139 
00140 template <class T> inline
00141 RefCountedPtr<T>::RefCountedPtr(T* ptr)
00142   : ptr_(ptr),
00143     refCount_(0)
00144 {
00145   if (ptr_)
00146     {
00147       refCount_ = new int;
00148       if (refCount_ == 0)
00149         MayDay::Error("RefCountedPtr::RefCountedPtr(T* ptr) out of memory");
00150       *refCount_ = 1;
00151     }
00152 }
00153 
00154 template <class T> inline
00155 RefCountedPtr<T>::RefCountedPtr(const RefCountedPtr<T>& other)
00156   : ptr_(other.ptr_),
00157     refCount_(other.refCount_)
00158 {
00159   if (refCount_ != 0)
00160     ++(*refCount_);
00161 }
00162 
00163 template <class T> inline
00164 RefCountedPtr<T>::~RefCountedPtr() {
00165   if (refCount_ != 0 && --(*refCount_) == 0)
00166     {
00167       delete ptr_;
00168       ptr_ = 0;
00169       delete refCount_;
00170       refCount_ = 0;
00171     }
00172 }
00173 
00174 template <class T> inline
00175 const RefCountedPtr<T>& RefCountedPtr<T>::operator =(const RefCountedPtr<T>& rhs) {
00176   if (ptr_ != rhs.ptr_)
00177     {
00178       if (refCount_ != 0 && --(*refCount_) == 0)
00179         {
00180           delete ptr_;
00181           delete refCount_;
00182         }
00183       ptr_ = rhs.ptr_;
00184       refCount_ = rhs.refCount_;
00185       if (refCount_ != 0)
00186         ++(*refCount_);
00187     }
00188   return *this;
00189 }
00190 
00191 template <class T> inline
00192 bool RefCountedPtr<T>::isNull() const {
00193   return (ptr_ == 0);
00194 }
00195 
00196 template <class T> inline
00197 T* RefCountedPtr<T>::operator ->() {
00198   if (ptr_ == 0)
00199     MayDay::Error("RefCountedPtr<T>::operator ->() on null pointer");
00200   return ptr_;
00201 }
00202 
00203 template <class T> inline
00204 const T* RefCountedPtr<T>::operator ->() const {
00205   if (ptr_ == 0)
00206     MayDay::Error("RefCountedPtr<T>::operator ->() on null pointer");
00207   return ptr_;
00208 }
00209 
00210 template <class T> inline
00211 T& RefCountedPtr<T>::operator *() {
00212   if (ptr_ == 0)
00213     MayDay::Error("RefCountedPtr<T>::operator *() on null pointer");
00214   return *ptr_;
00215 }
00216 
00217 template <class T> inline
00218 const T& RefCountedPtr<T>::operator *() const {
00219   if (ptr_ == 0)
00220     MayDay::Error("RefCountedPtr<T>::operator *() on null pointer");
00221   return *ptr_;
00222 }
00223 
00224 template <class T> inline
00225 RefCountedPtr<T>::operator const T* () const {
00226   return ptr_;
00227 }
00228 
00229 template <class T> inline
00230 bool RefCountedPtr<T>::isNonUnique() const {
00231   return refCount_ == 0 ? false : *refCount_ != 1;
00232 }
00233 
00234 template <class T> inline
00235 int RefCountedPtr<T>::refCount() const {
00236   return refCount_ == 0 ? 0 : *refCount_;
00237 }
00238 
00239 template <class T> inline
00240 void RefCountedPtr<T>::swap(RefCountedPtr<T>& b)
00241 {
00242   T* s = ptr_;
00243   ptr_ = b.ptr_;
00244   b.ptr_ = s;
00245 
00246   int* r = refCount_;
00247   refCount_ = b.refCount_;
00248   b.refCount_ = r;
00249 }
00250 #endif

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