bool.cc

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2006
 *
 *  Last modified:
 *     $Date: 2008-07-11 09:39:08 +0200 (Fri, 11 Jul 2008) $ by $Author: tack $
 *     $Revision: 7297 $
 *
 *  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:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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 */

#include "gecode/int.hh"

namespace Gecode { namespace Int {

  BoolVarImp BoolVarImp::s_one(1);
  BoolVarImp BoolVarImp::s_zero(0);

  ModEvent
  BoolVarImp::one_none(Space* home) {
    assert(none());
    bits() ^= (NONE ^ ONE);
    assert(one());
    IntDelta d(false);
    return notify(home,ME_BOOL_VAL,&d);
  }

  ModEvent
  BoolVarImp::zero_none(Space* home) {
    assert(none());
    bits() ^= (NONE ^ ZERO);
    assert(zero());
    IntDelta d(false);
    return notify(home,ME_BOOL_VAL,&d);
  }


  Reflection::Arg*
  BoolVarImp::spec(const Space*, Reflection::VarMap& m) const {
    int specIndex = m.index(this);
    if (specIndex != -1)
      return Reflection::Arg::newVar(specIndex);
    Reflection::VarSpec* spec =
      new Reflection::VarSpec(vti, Reflection::Arg::newInt(status()),
                              assigned());
    return (Reflection::Arg::newVar(m.put(this, spec)));
  }


  VarImpBase*
  BoolVarImp::create(Space* home, Reflection::VarSpec& spec) {
    unsigned int dom = spec.dom()->toInt();
    int min = 0;
    int max = 1;
    if (dom == Int::BoolVarImp::ZERO)
      max = 0;
    else if (dom == Int::BoolVarImp::ONE)
      min = 1;
    return new (home) BoolVarImp(home, min, max);
  }

  void
  BoolVarImp::constrain(Space* home, VarImpBase* v,
                        Reflection::VarSpec& spec) {
    unsigned int d = spec.dom()->toInt();
    if (d == Int::BoolVarImp::ZERO) {
      GECODE_ME_FAIL(home, static_cast<Int::BoolVarImp*>(v)->zero(home));
    } else if (d == Int::BoolVarImp::ONE) {
      GECODE_ME_FAIL(home, static_cast<Int::BoolVarImp*>(v)->one(home));
    }
  }

  namespace {
    Reflection::VarImpRegistrar<BoolVarImp> registerBoolVarImp;
  }

}}

// STATISTICS: int-var