div.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Guido Tack <tack@gecode.org>
 *     Vincent Barichard <Vincent.Barichard@univ-angers.fr>
 *
 *  Copyright:
 *     Guido Tack, 2008
 *     Vincent Barichard, 2012
 *
 *  Last modified:
 *     $Date: 2016-06-27 14:37:04 +0200 (Mon, 27 Jun 2016) $ by $Author: schulte $
 *     $Revision: 15129 $
 *
 *  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 {

  /*
   * Bounds consistent division operator
   *
   */
  template<class A, class B, class C>
  forceinline
  Div<A,B,C>::Div(Home home, A x0, B x1, C x2)
    : MixTernaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND,C,PC_FLOAT_BND>(home,x0,x1,x2) {}

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

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

  template<class A, class B, class C>
  ExecStatus
  Div<A,B,C>::post(Home home, A x0, B x1, C x2) {
    (void) new (home) Div<A,B,C>(home,x0,x1,x2);
    return ES_OK;
  }

  template<class A, class B, class C>
  ExecStatus
  Div<A,B,C>::propagate(Space& home, const ModEventDelta&) {
    if (x1.assigned() && (x1.val() == 0)) return ES_FAILED;
    GECODE_ME_CHECK(x2.eq(home,x0.domain() / x1.domain()));
    GECODE_ME_CHECK(x0.eq(home,x2.domain() * x1.domain()));
    if (!x2.assigned() || (x2.val() != 0.0))
      GECODE_ME_CHECK(x1.eq(home,x0.domain() / x2.domain()));
    return (x0.assigned() && x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_NOFIX;
  }

}}}

// STATISTICS: float-prop