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marked-pointer.hpp

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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  *  This file is part of Gecode, the generic constraint
00010  *  development environment:
00011  *     http://www.gecode.org
00012  *
00013  *  Permission is hereby granted, free of charge, to any person obtaining
00014  *  a copy of this software and associated documentation files (the
00015  *  "Software"), to deal in the Software without restriction, including
00016  *  without limitation the rights to use, copy, modify, merge, publish,
00017  *  distribute, sublicense, and/or sell copies of the Software, and to
00018  *  permit persons to whom the Software is furnished to do so, subject to
00019  *  the following conditions:
00020  *
00021  *  The above copyright notice and this permission notice shall be
00022  *  included in all copies or substantial portions of the Software.
00023  *
00024  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00027  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00028  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00029  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  *
00032  */
00033 
00034 #include <cstddef>
00035 
00036 namespace Gecode { namespace Support {
00037 
00039   bool marked(void* p);
00041   void* mark(void* p);
00043   void* unmark(void* p);
00045   void* fmark(void* p);
00047   void* funmark(void* p);
00049   void* ptrsplit(void* p, ptrdiff_t& m);
00051   void* ptrjoin(void* p, ptrdiff_t m);
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   forceinline void*
00077   ptrsplit(void* p, ptrdiff_t& m) {
00078     ptrdiff_t mp = reinterpret_cast<ptrdiff_t>(p);
00079     m = mp & 1;
00080     return reinterpret_cast<void*>(mp & ~static_cast<ptrdiff_t>(1));
00081   }
00082   forceinline void*
00083   ptrjoin(void* p, ptrdiff_t m) {
00084     return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p) | m);
00085   }
00086 
00087 }}
00088 
00089 // STATISTICS: support-any