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# csgeom/polypool.h

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    00001 /*
    00002     Copyright (C) 1998 by Jorrit Tyberghein
    00003
    00004     This library is free software; you can redistribute it and/or
    00005     modify it under the terms of the GNU Library General Public
    00006     License as published by the Free Software Foundation; either
    00007     version 2 of the License, or (at your option) any later version.
    00008
    00009     This library is distributed in the hope that it will be useful,
    00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
    00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00012     Library General Public License for more details.
    00013
    00014     You should have received a copy of the GNU Library General Public
    00015     License along with this library; if not, write to the Free
    00016     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00017 */
    00018
    00019 #ifndef __CS_POLYPOOL_H__
    00020 #define __CS_POLYPOOL_H__
    00021
    00029 #include "csextern.h"
    00030
    00031 #include "csgeom/poly2d.h"
    00032
    00039 class csPoly2DPool
    00040 {
    00041 private:
    00042   struct PoolObj
    00043   {
    00044     PoolObj* next;
    00045     csPoly2D* pol2d;
    00046   };
    00048   PoolObj* alloced;
    00050   PoolObj* freed;
    00051
    00052   // Factory for creating new polygons.
    00053   csPoly2DFactory* factory;
    00054
    00055 public:
    00057   csPoly2DPool (csPoly2DFactory* fact) : alloced (0), freed (0),
    00058         factory (fact) { }
    00059
    00061   ~csPoly2DPool ()
    00062   {
    00063     while (alloced)
    00064     {
    00065       PoolObj* n = alloced->next;
    00066       //delete alloced->pol2d; @@@ This free is not valid!
    00067       // We should use a ref count on the pool itself so that we
    00068       // now when all objects in the pool are freed and the
    00069       // 'alloced' list will be empty.
    00070       delete alloced;
    00071       alloced = n;
    00072     }
    00073     while (freed)
    00074     {
    00075       PoolObj* n = freed->next;
    00076       delete freed->pol2d;
    00077       delete freed;
    00078       freed = n;
    00079     }
    00080   }
    00081
    00083   csPoly2D* Alloc ()
    00084   {
    00085     PoolObj* pnew;
    00086     if (freed)
    00087     {
    00088       pnew = freed;
    00089       freed = freed->next;
    00090     }
    00091     else
    00092     {
    00093       pnew = new PoolObj ();
    00094       pnew->pol2d = factory->Create ();
    00095     }
    00096     pnew->next = alloced;
    00097     alloced = pnew;
    00098     return pnew->pol2d;
    00099   }
    00100
    00106   void Free (csPoly2D* pol)
    00107   {
    00108     if (alloced)
    00109     {
    00110       PoolObj* po = alloced;
    00111       alloced = alloced->next;
    00112       po->pol2d = pol;
    00113       po->next = freed;
    00114       freed = po;
    00115     }
    00116     else
    00117     {
    00118       // Cannot happen!
    00119       CS_ASSERT (false);
    00120     }
    00121   }
    00122 };
    00123
    00126 #endif // __CS_POLYPOOL_H__