csutil/weakreferenced.h Source File (Crystal Space 2.0 Public API Reference)

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csutil/weakreferenced.h
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    00001 /*
    00002     Crystal Space Weak Reference Counting Implementation
    00003     Copyright (C) 2006 by Jorrit Tyberghein
    00004               (C) 2006 by Amir Taaki
    00005
    00006     This library is free software; you can redistribute it and/or
    00007     modify it under the terms of the GNU Library General Public
    00008     License as published by the Free Software Foundation; either
    00009     version 2 of the License, or (at your option) any later version.
    00010
    00011     This library is distributed in the hope that it will be useful,
    00012     but WITHOUT ANY WARRANTY; without even the implied warranty of
    00013     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00014     Library General Public License for more details.
    00015
    00016     You should have received a copy of the GNU Library General Public
    00017     License along with this library; if not, write to the Free
    00018     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00019 */
    00020
    00021 #ifndef __CS_CSUTIL_WEAKREFERENCED_H__
    00022 #define __CS_CSUTIL_WEAKREFERENCED_H__
    00023
    00028 #include "array.h"
    00029
    00030 namespace CS
    00031 {
    00032 namespace Utility
    00033 {
    00034
    00042 class WeakReferenced
    00043 {
    00044 public:
    00045   WeakReferenced () : weakref_owners (0) {}
    00046   ~WeakReferenced ()
    00047   {
    00048     if (weakref_owners)
    00049     {
    00050       for (size_t i = 0; i < weakref_owners->GetSize(); i++)
    00051       {
    00052         *((*weakref_owners)[i]) = 0;
    00053       }
    00054       delete weakref_owners;
    00055     }
    00056   }
    00057
    00058   void AddRefOwner (void** ref_owner)
    00059   {
    00060     if (!weakref_owners)
    00061       weakref_owners = new WeakRefOwnerArray (0);
    00062     weakref_owners->InsertSorted (ref_owner);
    00063   }
    00064   void RemoveRefOwner (void** ref_owner)
    00065   {
    00066     if (!weakref_owners)
    00067       return;
    00068
    00069     size_t index = weakref_owners->FindSortedKey (
    00070       csArrayCmp<void**, void**>(ref_owner));
    00071
    00072     if (index != csArrayItemNotFound)
    00073       weakref_owners->DeleteIndex (index);
    00074   }
    00075
    00076 private:
    00077   typedef csArray<void**,
    00078     csArrayElementHandler<void**>,
    00079     CS::Memory::AllocatorMalloc,
    00080     csArrayCapacityLinear<csArrayThresholdFixed<4> > > WeakRefOwnerArray;
    00081   WeakRefOwnerArray* weakref_owners;
    00082 };
    00083
    00084 } // namespace Utility
    00085 } // namespace CS
    00086
    00087 #endif // __CS_CSUTIL_WEAKREFERENCED_H__