Main Page | Namespace List | Class Hierarchy | Alphabetical List | Class List | Directories | File List | Namespace Members | Class Members | File Members

CEGUIRefPtr.h

Go to the documentation of this file.
00001 /************************************************************************
00002         filename:       CEGUIRefPtr.h
00003         created:        15/10/2004
00004         author:         Gerald Lindsly
00005 *************************************************************************/
00006 /*************************************************************************
00007     Crazy Eddie's GUI System (http://www.cegui.org.uk)
00008     Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)
00009 
00010     This library is free software; you can redistribute it and/or
00011     modify it under the terms of the GNU Lesser General Public
00012     License as published by the Free Software Foundation; either
00013     version 2.1 of the License, or (at your option) any later version.
00014 
00015     This library is distributed in the hope that it will be useful,
00016     but WITHOUT ANY WARRANTY; without even the implied warranty of
00017     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018     Lesser General Public License for more details.
00019 
00020     You should have received a copy of the GNU Lesser General Public
00021     License along with this library; if not, write to the Free Software
00022     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00023 *************************************************************************/
00024 #ifndef _CEGUIRefPtr_h_
00025 #define _CEGUIRefPtr_h_
00026 
00027 #include "CEGUIBase.h"
00028 
00029 namespace CEGUI {
00030 
00031 class CEGUIBASE_API Referenced
00032 {
00033 public:
00034   Referenced() : d_refCount(0) {}
00035   Referenced(const Referenced&) : d_refCount(0) {}
00036 
00037   Referenced& operator=(Referenced&) { return *this; }
00038 
00039   /* Increment the reference count by one, indicating that 
00040       a pointer to this object is referencing it. */
00041   void addRef() const { ++d_refCount; }
00042   
00043   /* Decrement the reference count by one, indicating that 
00044      a pointer to this object is no longer referencing it. 
00045      if the count drops to zero, this is deleted. */
00046   void release() const { if (!--d_refCount) delete this; }
00047   
00048   /* Decrement the reference count by one, indicating that 
00049       a pointer to this object is no longer referencing it;
00050       however, do not delete it, even if ref count goes to 0. */
00051   void releaseButKeep() const { --d_refCount; }
00052   
00054   int refCount() const { return d_refCount; }
00055  
00056 protected:
00057   virtual ~Referenced();
00058   mutable int d_refCount;
00059 };
00060 
00061 
00062 template<class T> class RefPtr
00063 {
00064   T* d_p;
00065 
00066 public:
00067 //  RefPtr()     : d_p(0) {}
00068   
00069   RefPtr()     : d_p(new T()) { d_p->addRef(); }
00070 
00071   RefPtr(T* t) : d_p(t) { if (t)   d_p->addRef(); }
00072   RefPtr(const RefPtr& r) : d_p(r.d_p)
00073                         { if (r.d_p) d_p->addRef(); }
00074   ~RefPtr()
00075   { if (d_p) {
00076       d_p->release();
00077       d_p = 0;
00078     }
00079   }
00080 
00081   RefPtr& operator=(T* q)
00082   {
00083     if (d_p != q) {
00084       T* t = d_p;
00085       d_p = q;
00086       if (q) q->addRef();
00087       if (t) t->release();
00088     }
00089     return *this;
00090   }
00091 
00092   RefPtr& operator=(const RefPtr& r) { return *this = r.d_p; }
00093 
00094   bool operator==(const RefPtr& r) const { return d_p == r.d_p; }
00095   bool operator!=(const RefPtr& r) const { return d_p != r.d_p; }
00096   bool operator< (const RefPtr& r) const { return d_p <  r.d_p; }
00097   bool operator> (const RefPtr& r) const { return d_p >  r.d_p; }
00098 
00099   bool operator ==(const T* q) const { return d_p == q; }
00100   bool operator !=(const T* q) const { return d_p != q; }
00101   bool operator < (const T* q) const { return d_p <  q; }
00102   bool operator > (const T* q) const { return d_p >  q; }
00103 
00104 
00105         T& operator*()        { return *d_p; }
00106   const T& operator*() const  { return *d_p; }
00107 
00108         T* operator->()       { return d_p; }
00109   const T* operator->() const { return d_p; }
00110 
00111         T* get()              { return d_p; }
00112   const T* get() const        { return d_p; }
00113 
00114   bool operator!() const            { return d_p == 0; }
00115   bool valid() const            { return d_p != 0; }
00116 
00117   T* release()
00118   {
00119     T* t = d_p;
00120     if (d_p) {
00121       d_p->releaseButKeep();
00122       d_p = 0;
00123     } 
00124     return t;
00125   }
00126 };
00127 
00128 } // end namespace CEGUI
00129 
00130 #endif

Generated on Wed Feb 16 12:41:07 2005 for Crazy Eddies GUI System by  doxygen 1.3.9.1