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pointer.h

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00001 /*  Inti: Integrated Foundation Classes
00002  *  Copyright (C) 2002 The Inti Development Team.
00003  *      Copyright (C) 2000 Red Hat, Inc.
00004  *
00005  *  This program is free software; you can redistribute it and/or modify
00006  *  it under the terms of the GNU General Public License as published by
00007  *  the Free Software Foundation; either version 2 of the License, or
00008  *  (at your option) any later version.
00009  *
00010  *  This program is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *  GNU Library General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU Library General Public License
00016  *  along with this program; if not, write to the Free Software
00017  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00018  */
00019 
00024 
00025 #ifndef INTI_POINTER_H
00026 #define INTI_POINTER_H
00027 
00028 namespace Inti {
00029 
00036 
00037 template <typename T>
00038 class Pointer
00039 {
00040         T *t;
00041 
00042         void set(T *object)
00043         {
00044                 if (object)
00045                 {
00046                         if (!object->is_referenced())
00047                                 object->ref();
00048                         object->set_referenced(false);
00049                 }
00050                 if (t)
00051                         t->unref();
00052                 t = object;
00053         }
00054 
00055 public:
00058 
00059         Pointer(T *object = 0) : t(0)
00060         {
00061                 set(object);
00062         }
00067 
00068         Pointer(Pointer& src) : t(0)
00069         {
00070                 set(src.get());
00071         }
00076 
00077         template <typename T1>
00078         Pointer(const Pointer<T1>& src) : t(0)
00079         {
00080                 set(src.get());
00081         }
00087 
00088         ~Pointer()
00089         {
00090                 set(0);
00091         }
00094 
00095         Pointer& operator=(T *object)
00096         {
00097                 set(object);
00098                 return *this;
00099         }
00105 
00106         Pointer& operator=(const Pointer& src)
00107         {
00108                 set(src.get());
00109                 return *this;
00110         }
00116 
00117         template <typename T1>
00118         Pointer& operator=(const Pointer<T1>& src)
00119         {
00120                 set(src.get());
00121                 return *this;
00122         }
00129 
00133 
00134         T& operator*() const
00135         {
00136                 return *get();
00137         }
00140 
00141         T* operator->() const
00142         {
00143                 return get();
00144         }
00147 
00148         operator T*() const
00149         {
00150                 return get();
00151         }
00158 
00159         T* get() const
00160         {
00161                 return t;
00162         }
00165 
00166         bool null() const
00167         {
00168                 return t == 0;
00169         }
00171 
00175 
00176         T* release()
00177         {
00178                 T *tmp = t;
00179                 if (tmp)
00180                         tmp->ref();
00181                 set(0);
00182                 return tmp;
00183         }
00190 
00191         void reset(T *object = 0)
00192         {
00193                 set(object);
00194         }
00200         
00202 };
00203 
00206 
00207 template<typename T1, typename T2>
00208 inline bool operator == (const Pointer<T1>& t1, const Pointer<T2>& t2)
00209 {
00210         return t1.t == t2.t;
00211 }
00214 
00215 template<typename T1, typename T2>
00216 inline bool operator != (const Pointer<T1>& t1, const Pointer<T2>& t2)
00217 {
00218         return !(t1 == t2);
00219 }
00222 
00226 
00227 template <typename To, typename From>
00228 inline Pointer<To>
00229 cast_const(const Pointer<From>& from)
00230 {
00231         return Pointer<To>(from ? const_cast<To*>(from.get()) : 0);
00232 }
00239 
00240 template <typename To, typename From>
00241 inline Pointer<To>
00242 cast_dynamic(const Pointer<From>& from)
00243 {
00244         return Pointer<To>(dynamic_cast<To*>(from.get()));
00245 }
00252 
00253 template <typename To, typename From>
00254 inline Pointer<To>
00255 cast_static(const Pointer<From>& from)
00256 {
00257         return Pointer<To>(from ? static_cast<To*>(from.get()) : 0);
00258 }
00265 
00267 
00268 } // namespace Inti
00269 
00270 #endif // INTI_POINTER_H
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