abs.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *     Guido Tack <tack@gecode.org>
 *     Vincent Barichard <Vincent.Barichard@univ-angers.fr>
 *
 *  Copyright:
 *     Christian Schulte, 2004
 *     Guido Tack, 2006
 *     Vincent Barichard, 2012
 *
 *  Last modified:
 *     $Date: 2017-04-10 13:21:37 +0200 (Mon, 10 Apr 2017) $ by $Author: schulte $
 *     $Revision: 15631 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
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namespace Gecode { namespace Float { namespace Arithmetic {

  template<class A, class B>
  forceinline
  Abs<A,B>::Abs(Home home, A x0, B x1)
    : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1) {}

  template<class A, class B>
  ExecStatus
  Abs<A,B>::post(Home home, A x0, B x1) {
    (void) new (home) Abs<A,B>(home,x0,x1);
    return ES_OK;
  }

  template<class A, class B>
  forceinline
  Abs<A,B>::Abs(Space& home, bool share, Abs<A,B>& p)
    : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,share,p) {}

  template<class A, class B>
  Actor*
  Abs<A,B>::copy(Space& home, bool share) {
    return new (home) Abs<A,B>(home,share,*this);
  }

  template<class A, class B>
  ExecStatus
  Abs<A,B>::propagate(Space& home, const ModEventDelta&) {
    GECODE_ME_CHECK(x1.eq(home,abs(x0.val())));
    if (x0.min() >= 0)
      GECODE_ME_CHECK(x0.eq(home,FloatVal(x1.min(), x1.max())));
    else if (x0.max() <= 0)
      GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), -x1.min())));
    else
      GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), x1.max())));
    return (x0.assigned() && x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
  }

}}}

// STATISTICS: float-prop