marked-pointer.hpp
Go to the documentation of this file.00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */ 00002 /* 00003 * Main authors: 00004 * Christian Schulte <schulte@gecode.org> 00005 * 00006 * Copyright: 00007 * Christian Schulte, 2008 00008 * 00009 * Last modified: 00010 * $Date: 2009-10-16 10:20:59 +0200 (Fri, 16 Oct 2009) $ by $Author: schulte $ 00011 * $Revision: 9936 $ 00012 * 00013 * This file is part of Gecode, the generic constraint 00014 * development environment: 00015 * http://www.gecode.org 00016 * 00017 * Permission is hereby granted, free of charge, to any person obtaining 00018 * a copy of this software and associated documentation files (the 00019 * "Software"), to deal in the Software without restriction, including 00020 * without limitation the rights to use, copy, modify, merge, publish, 00021 * distribute, sublicense, and/or sell copies of the Software, and to 00022 * permit persons to whom the Software is furnished to do so, subject to 00023 * the following conditions: 00024 * 00025 * The above copyright notice and this permission notice shall be 00026 * included in all copies or substantial portions of the Software. 00027 * 00028 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 00029 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 00030 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 00031 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 00032 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 00033 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 00034 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 00035 * 00036 */ 00037 00038 #include <cstddef> 00039 00040 namespace Gecode { namespace Support { 00041 00043 bool marked(void* p); 00045 void* mark(void* p); 00047 void* unmark(void* p); 00049 void* fmark(void* p); 00051 void* funmark(void* p); 00052 00053 forceinline bool 00054 marked(void* p) { 00055 return (reinterpret_cast<ptrdiff_t>(p) & 1) != 0; 00056 } 00057 forceinline void* 00058 mark(void* p) { 00059 assert(!marked(p)); 00060 return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)+1); 00061 } 00062 forceinline void* 00063 unmark(void* p) { 00064 assert(marked(p)); 00065 return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)-1); 00066 } 00067 forceinline void* 00068 fmark(void* p) { 00069 return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)|1); 00070 } 00071 forceinline void* 00072 funmark(void* p) { 00073 return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)& 00074 ~static_cast<ptrdiff_t>(1)); 00075 } 00076 00077 }} 00078 00079 // STATISTICS: support-any