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weakref.h

00001 /*
00002   Crystal Space Weak Reference
00003   Copyright (C) 2003 by Jorrit Tyberghein and Matthias Braun
00004 
00005   This library is free software; you can redistribute it and/or
00006   modify it under the terms of the GNU Library General Public
00007   License as published by the Free Software Foundation; either
00008   version 2 of the License, or (at your option) any later version.
00009 
00010   This library 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 GNU
00013   Library General Public License for more details.
00014 
00015   You should have received a copy of the GNU Library General Public
00016   License along with this library; if not, write to the Free
00017   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00018 */
00019 
00020 #ifndef __CS_WEAKREF_H__
00021 #define __CS_WEAKREF_H__
00022 
00038 template <class T>
00039 class csWeakRef
00040 {
00041 private:
00042   T* obj;
00043 
00044 public:
00048   csWeakRef () : obj (0) {}
00049 
00053   csWeakRef (T* newobj)
00054   {
00055     obj = newobj.obj;
00056     if (obj) obj->AddRefOwner (&obj);
00057   }
00058 
00062   csWeakRef (csWeakRef const& other) : obj (other.obj)
00063   {
00064     if (obj) obj->AddRefOwner (&obj);
00065   }
00066 
00070   ~csWeakRef ()
00071   {
00072     if (obj) obj->RemoveRefOwner (&obj);
00073   }
00074 
00078   csWeakRef& operator = (T* newobj)
00079   {
00080     if (obj != newobj)
00081     {
00082       if (obj) obj->RemoveRefOwner (&obj);
00083       obj = newobj;
00084       if (obj) obj->AddRefOwner (&obj);
00085     }
00086     return *this;
00087   }
00088 
00092   csWeakRef& operator = (csWeakRef const& other)
00093   {
00094     this->operator=(other.obj);
00095     return *this;
00096   }
00097 
00099   inline friend bool operator == (const csWeakRef& r1, const csWeakRef& r2)
00100   {
00101     return r1.obj == r2.obj;
00102   }
00104   inline friend bool operator != (const csWeakRef& r1, const csWeakRef& r2)
00105   {
00106     return r1.obj != r2.obj;
00107   }
00109   inline friend bool operator == (const csWeakRef& r1, T* obj)
00110   {
00111     return r1.obj == obj;
00112   }
00114   inline friend bool operator != (const csWeakRef& r1, T* obj)
00115   {
00116     return r1.obj != obj;
00117   }
00119   inline friend bool operator == (T* obj, const csWeakRef& r1)
00120   {
00121     return r1.obj == obj;
00122   }
00124   inline friend bool operator != (T* obj, const csWeakRef& r1)
00125   {
00126     return r1.obj != obj;
00127   }
00128 
00130   T* operator -> () const
00131   { return obj; }
00132   
00134   operator T* () const
00135   { return obj; }
00136   
00138   T& operator* () const
00139   { return *obj; }
00140 
00145   bool IsValid () const
00146   { return (obj != 0); }
00147 };
00148 
00149 #endif // __CS_WEAKREF_H__
00150 

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