csgeom/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 "csgeom/poly2d.h" 00029 00036 class csPoly2DPool 00037 { 00038 private: 00039 struct PoolObj 00040 { 00041 PoolObj* next; 00042 csPoly2D* pol2d; 00043 }; 00045 PoolObj* alloced; 00047 PoolObj* freed; 00048 00049 // Factory for creating new polygons. 00050 csPoly2DFactory* factory; 00051 00052 public: 00054 csPoly2DPool (csPoly2DFactory* fact) : alloced (0), freed (0), 00055 factory (fact) { } 00056 00058 ~csPoly2DPool () 00059 { 00060 while (alloced) 00061 { 00062 PoolObj* n = alloced->next; 00063 //delete alloced->pol2d; @@@ This free is not valid! 00064 // We should use a ref count on the pool itself so that we 00065 // now when all objects in the pool are freed and the 00066 // 'alloced' list will be empty. 00067 delete alloced; 00068 alloced = n; 00069 } 00070 while (freed) 00071 { 00072 PoolObj* n = freed->next; 00073 delete freed->pol2d; 00074 delete freed; 00075 freed = n; 00076 } 00077 } 00078 00080 csPoly2D* Alloc () 00081 { 00082 PoolObj* pnew; 00083 if (freed) 00084 { 00085 pnew = freed; 00086 freed = freed->next; 00087 } 00088 else 00089 { 00090 pnew = new PoolObj (); 00091 pnew->pol2d = factory->Create (); 00092 } 00093 pnew->next = alloced; 00094 alloced = pnew; 00095 return pnew->pol2d; 00096 } 00097 00103 void Free (csPoly2D* pol) 00104 { 00105 if (alloced) 00106 { 00107 PoolObj* po = alloced; 00108 alloced = alloced->next; 00109 po->pol2d = pol; 00110 po->next = freed; 00111 freed = po; 00112 } 00113 else 00114 { 00115 // Cannot happen! 00116 CS_ASSERT (false); 00117 } 00118 } 00119 }; 00120 00123 #endif // __CS_POLYPOOL_H__
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