comb-ptr-flag.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2003
 *
 *  Last modified:
 *     $Date: 2011-08-17 21:42:11 +0200 (Wed, 17 Aug 2011) $ by $Author: schulte $
 *     $Revision: 12306 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
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 *  included in all copies or substantial portions of the Software.
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namespace Gecode { namespace Int { namespace ViewValGraph {

  template<class T>
  forceinline
  CombPtrFlag<T>::CombPtrFlag(T* p1, T* p2)
    : cpf(reinterpret_cast<ptrdiff_t>(p1) ^ reinterpret_cast<ptrdiff_t>(p2)) {}

  template<class T>
  forceinline T*
  CombPtrFlag<T>::ptr(T* p) const {
    return reinterpret_cast<T*>((cpf&~1) ^ reinterpret_cast<ptrdiff_t>(p));
  }

  template<class T>
  forceinline int
  CombPtrFlag<T>::is_set(void) const {
    return static_cast<int>(cpf&1);
  }

  template<class T>
  forceinline void
  CombPtrFlag<T>::set(void) {
    cpf |= 1;
  }

  template<class T>
  forceinline void
  CombPtrFlag<T>::unset(void) {
    cpf &= ~1;
  }

  template<class T>
  forceinline void
  CombPtrFlag<T>::init(T* p1, T* p2) {
    cpf = reinterpret_cast<ptrdiff_t>(p1) ^ reinterpret_cast<ptrdiff_t>(p2);
  }

}}}

// STATISTICS: int-prop