OpenTTD
countedptr.hpp
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1 /* $Id: countedptr.hpp 24900 2013-01-08 22:46:42Z planetmaker $ */
2 
3 /*
4  * This file is part of OpenTTD.
5  * 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.
6  * 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.
7  * 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/>.
8  */
9 
12 #ifndef COUNTEDPTR_HPP
13 #define COUNTEDPTR_HPP
14 
26 template <class Tcls_>
27 class CCountedPtr {
29 public:
30  typedef Tcls_ Tcls;
31 
32 protected:
35 
36 public:
38  inline CCountedPtr(Tcls *pObj = NULL) : m_pT(pObj) {AddRef();}
39 
41  inline CCountedPtr(const CCountedPtr& src) : m_pT(src.m_pT) {AddRef();}
42 
44  inline ~CCountedPtr() {Release();}
45 
46 protected:
48  inline void AddRef() {if (m_pT != NULL) m_pT->AddRef();}
49 
50 public:
52  inline void Release() {if (m_pT != NULL) {Tcls *pT = m_pT; m_pT = NULL; pT->Release();}}
53 
55  inline const Tcls *operator -> () const {assert(m_pT != NULL); return m_pT;}
56 
58  inline Tcls *operator -> () {assert(m_pT != NULL); return m_pT;}
59 
61  inline operator const Tcls*() const {assert(m_pT == NULL); return m_pT;}
62 
64  inline operator Tcls*() {return m_pT;}
65 
67  inline Tcls** operator &() {assert(m_pT == NULL); return &m_pT;}
68 
70  inline CCountedPtr& operator = (Tcls *pT) {Assign(pT); return *this;}
71 
73  inline CCountedPtr& operator = (const CCountedPtr& src) {Assign(src.m_pT); return *this;}
74 
76  inline void Assign(Tcls *pT);
77 
79  inline bool IsNull() const {return m_pT == NULL;}
80 
82  //inline bool operator == (const CCountedPtr& sp) const {return m_pT == sp.m_pT;}
83 
85  //inline bool operator != (const CCountedPtr& sp) const {return m_pT != sp.m_pT;}
86 
88  inline void Attach(Tcls *pT) {Release(); m_pT = pT;}
89 
91  inline Tcls *Detach() {Tcls *pT = m_pT; m_pT = NULL; return pT;}
92 };
93 
94 template <class Tcls_>
96 {
97  /* if they are the same, we do nothing */
98  if (pT != m_pT) {
99  if (pT != NULL) pT->AddRef(); // AddRef new pointer if any
100  Tcls *pTold = m_pT; // save original ptr
101  m_pT = pT; // update m_pT to new value
102  if (pTold != NULL) pTold->Release(); // release old ptr if any
103  }
104 }
105 
111 template <class T> struct AdaptT {
112  T m_t;
113 
115  AdaptT(const T &t)
116  : m_t(t)
117  {}
118 
120  T& operator = (const T &t)
121  {
122  m_t = t;
123  return t;
124  }
125 
127  operator T& ()
128  {
129  return m_t;
130  }
131 
133  operator const T& () const
134  {
135  return m_t;
136  }
137 };
138 
139 
150  int32 m_ref_cnt;
151 
153  : m_ref_cnt(0)
154  {}
155 
156  virtual ~SimpleCountedObject()
157  {}
158 
159  virtual int32 AddRef();
160  virtual int32 Release();
161  virtual void FinalRelease() {};
162 };
163 
164 
165 
166 
167 #endif /* COUNTEDPTR_HPP */