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comb-ptr-flag.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, 2003
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 namespace Gecode { namespace Int { namespace ViewValGraph {
00035 
00036   template<class T>
00037   forceinline
00038   CombPtrFlag<T>::CombPtrFlag(T* p1, T* p2)
00039     : cpf(reinterpret_cast<ptrdiff_t>(p1) ^ reinterpret_cast<ptrdiff_t>(p2)) {}
00040 
00041   template<class T>
00042   forceinline T*
00043   CombPtrFlag<T>::ptr(T* p) const {
00044     return reinterpret_cast<T*>((cpf&~1) ^ reinterpret_cast<ptrdiff_t>(p));
00045   }
00046 
00047   template<class T>
00048   forceinline int
00049   CombPtrFlag<T>::is_set(void) const {
00050     return static_cast<int>(cpf&1);
00051   }
00052 
00053   template<class T>
00054   forceinline void
00055   CombPtrFlag<T>::set(void) {
00056     cpf |= 1;
00057   }
00058 
00059   template<class T>
00060   forceinline void
00061   CombPtrFlag<T>::unset(void) {
00062     cpf &= ~1;
00063   }
00064 
00065   template<class T>
00066   forceinline void
00067   CombPtrFlag<T>::init(T* p1, T* p2) {
00068     cpf = reinterpret_cast<ptrdiff_t>(p1) ^ reinterpret_cast<ptrdiff_t>(p2);
00069   }
00070 
00071 }}}
00072 
00073 // STATISTICS: int-prop
00074