countedptr.hpp

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #ifndef COUNTEDPTR_HPP
00013 #define COUNTEDPTR_HPP
00014 
00026 template <class Tcls_>
00027 class CCountedPtr {
00029 public:
00030   typedef Tcls_ Tcls;
00031 
00032 protected:
00034   Tcls *m_pT;
00035 
00036 public:
00038   FORCEINLINE CCountedPtr(Tcls *pObj = NULL) : m_pT(pObj) {AddRef();}
00039 
00041   FORCEINLINE CCountedPtr(const CCountedPtr& src) : m_pT(src.m_pT) {AddRef();}
00042 
00044   FORCEINLINE ~CCountedPtr() {Release();}
00045 
00046 protected:
00048   FORCEINLINE void AddRef() {if (m_pT != NULL) m_pT->AddRef();}
00049 
00050 public:
00052   FORCEINLINE void Release() {if (m_pT != NULL) {Tcls *pT = m_pT; m_pT = NULL; pT->Release();}}
00053 
00055   FORCEINLINE const Tcls *operator -> () const {assert(m_pT != NULL); return m_pT;}
00056 
00058   FORCEINLINE Tcls *operator -> () {assert(m_pT != NULL); return m_pT;}
00059 
00061   FORCEINLINE operator const Tcls*() const {assert(m_pT == NULL); return m_pT;}
00062 
00064   FORCEINLINE operator Tcls*() {return m_pT;}
00065 
00067   FORCEINLINE Tcls** operator &() {assert(m_pT == NULL); return &m_pT;}
00068 
00070   FORCEINLINE CCountedPtr& operator = (Tcls *pT) {Assign(pT); return *this;}
00071 
00073   FORCEINLINE CCountedPtr& operator = (const CCountedPtr& src) {Assign(src.m_pT); return *this;}
00074 
00076   FORCEINLINE void Assign(Tcls *pT);
00077 
00079   FORCEINLINE bool IsNull() const {return m_pT == NULL;}
00080 
00082   //FORCEINLINE bool operator == (const CCountedPtr& sp) const {return m_pT == sp.m_pT;}
00083 
00085   //FORCEINLINE bool operator != (const CCountedPtr& sp) const {return m_pT != sp.m_pT;}
00086 
00088   FORCEINLINE void Attach(Tcls *pT) {Release(); m_pT = pT;}
00089 
00091   FORCEINLINE Tcls *Detach() {Tcls *pT = m_pT; m_pT = NULL; return pT;}
00092 };
00093 
00094 template <class Tcls_>
00095 FORCEINLINE void CCountedPtr<Tcls_>::Assign(Tcls *pT)
00096 {
00097   /* if they are the same, we do nothing */
00098   if (pT != m_pT) {
00099     if (pT != NULL) pT->AddRef();        // AddRef new pointer if any
00100     Tcls *pTold = m_pT;                  // save original ptr
00101     m_pT = pT;                           // update m_pT to new value
00102     if (pTold != NULL) pTold->Release(); // release old ptr if any
00103   }
00104 }
00105 
00111 template <class T> struct AdaptT {
00112   T m_t;
00113 
00115   AdaptT(const T &t)
00116     : m_t(t)
00117   {}
00118 
00120   T& operator = (const T &t)
00121   {
00122     m_t = t;
00123     return t;
00124   }
00125 
00127   operator T& ()
00128   {
00129     return m_t;
00130   }
00131 
00133   operator const T& () const
00134   {
00135     return m_t;
00136   }
00137 };
00138 
00139 
00149 struct SimpleCountedObject {
00150   int32 m_ref_cnt;
00151 
00152   SimpleCountedObject()
00153     : m_ref_cnt(0)
00154   {}
00155 
00156   virtual ~SimpleCountedObject()
00157   {}
00158 
00159   virtual int32 AddRef();
00160   virtual int32 Release();
00161   virtual void FinalRelease() {};
00162 };
00163 
00164 
00165 
00166 
00167 #endif /* COUNTEDPTR_HPP */

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