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polypool.h
Go to the documentation of this file.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 00028 #include "csextern.h" 00029 00030 #include "csgeom/poly2d.h" 00031 00038 class csPoly2DPool 00039 { 00040 private: 00041 struct PoolObj 00042 { 00043 PoolObj* next; 00044 csPoly2D* pol2d; 00045 }; 00047 PoolObj* alloced; 00049 PoolObj* freed; 00050 00051 // Factory for creating new polygons. 00052 csPoly2DFactory* factory; 00053 00054 public: 00056 csPoly2DPool (csPoly2DFactory* fact) : alloced (0), freed (0), 00057 factory (fact) { } 00058 00060 ~csPoly2DPool () 00061 { 00062 while (alloced) 00063 { 00064 PoolObj* n = alloced->next; 00065 //delete alloced->pol2d; @@@ This free is not valid! 00066 // We should use a ref count on the pool itself so that we 00067 // now when all objects in the pool are freed and the 00068 // 'alloced' list will be empty. 00069 delete alloced; 00070 alloced = n; 00071 } 00072 while (freed) 00073 { 00074 PoolObj* n = freed->next; 00075 delete freed->pol2d; 00076 delete freed; 00077 freed = n; 00078 } 00079 } 00080 00082 csPoly2D* Alloc () 00083 { 00084 PoolObj* pnew; 00085 if (freed) 00086 { 00087 pnew = freed; 00088 freed = freed->next; 00089 } 00090 else 00091 { 00092 pnew = new PoolObj (); 00093 pnew->pol2d = factory->Create (); 00094 } 00095 pnew->next = alloced; 00096 alloced = pnew; 00097 return pnew->pol2d; 00098 } 00099 00105 void Free (csPoly2D* pol) 00106 { 00107 if (alloced) 00108 { 00109 PoolObj* po = alloced; 00110 alloced = alloced->next; 00111 po->pol2d = pol; 00112 po->next = freed; 00113 freed = po; 00114 } 00115 else 00116 { 00117 // Cannot happen! 00118 CS_ASSERT (false); 00119 } 00120 } 00121 }; 00122 00125 #endif // __CS_POLYPOOL_H__
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