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polypool.h00001 /* 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 00022 #include "csgeom/poly2d.h" 00023 00030 class csPoly2DPool 00031 { 00032 private: 00033 struct PoolObj 00034 { 00035 PoolObj* next; 00036 csPoly2D* pol2d; 00037 }; 00039 PoolObj* alloced; 00041 PoolObj* freed; 00042 00043 // Factory for creating new polygons. 00044 csPoly2DFactory* factory; 00045 00046 public: 00048 csPoly2DPool (csPoly2DFactory* fact) : alloced (NULL), freed (NULL), 00049 factory (fact) { } 00050 00052 ~csPoly2DPool () 00053 { 00054 while (alloced) 00055 { 00056 PoolObj* n = alloced->next; 00057 //delete alloced->pol2d; @@@ This free is not valid! 00058 // We should use a ref count on the pool itself so that we 00059 // now when all objects in the pool are freed and the 00060 // 'alloced' list will be empty. 00061 delete alloced; 00062 alloced = n; 00063 } 00064 while (freed) 00065 { 00066 PoolObj* n = freed->next; 00067 delete freed->pol2d; 00068 delete freed; 00069 freed = n; 00070 } 00071 } 00072 00074 csPoly2D* Alloc () 00075 { 00076 PoolObj* pnew; 00077 if (freed) 00078 { 00079 pnew = freed; 00080 freed = freed->next; 00081 } 00082 else 00083 { 00084 pnew = new PoolObj (); 00085 pnew->pol2d = factory->Create (); 00086 } 00087 pnew->next = alloced; 00088 alloced = pnew; 00089 return pnew->pol2d; 00090 } 00091 00097 void Free (csPoly2D* pol) 00098 { 00099 if (alloced) 00100 { 00101 PoolObj* po = alloced; 00102 alloced = alloced->next; 00103 po->pol2d = pol; 00104 po->next = freed; 00105 freed = po; 00106 } 00107 else 00108 { 00109 // Cannot happen! 00110 CS_ASSERT (false); 00111 } 00112 } 00113 }; 00114 00115 00116 #endif // __CS_POLYPOOL_H__ Generated for Crystal Space by doxygen 1.2.5 written by Dimitri van Heesch, ©1997-2000 |