linear.hh

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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, 2002
 *     Guido Tack, 2004
 *     Vincent Barichard, 2012
 *
 *  Last modified:
 *     $Date: 2016-06-29 17:28:17 +0200 (Wed, 29 Jun 2016) $ by $Author: schulte $
 *     $Revision: 15137 $
 *
 *  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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 */

#ifndef __GECODE_FLOAT_LINEAR_HH__
#define __GECODE_FLOAT_LINEAR_HH__

#include <gecode/int.hh>
#include <gecode/float.hh>

namespace Gecode { namespace Float { namespace Linear {

  template<class P, class N, PropCond pc>
  class Lin : public Propagator {
  protected:
    ViewArray<P> x;
    ViewArray<N> y;
    FloatVal c;

    Lin(Space& home, bool share, Lin<P,N,pc>& p);
    Lin(Home home, ViewArray<P>& x, ViewArray<N>& y, FloatVal c);
  public:
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    virtual void reschedule(Space& home);
    virtual size_t dispose(Space& home);
  };

  template<class View>
  void bounds_p(ModEventDelta med, ViewArray<View>& x,
                FloatVal& c, FloatNum& sl, FloatNum& su);

  template<class View>
  void bounds_n(ModEventDelta med, ViewArray<View>& y,
                FloatVal& c, FloatNum& sl, FloatNum& su);

  template<class P, class N>
  class Eq : public Lin<P,N,PC_FLOAT_BND> {
  protected:
    using Lin<P,N,PC_FLOAT_BND>::x;
    using Lin<P,N,PC_FLOAT_BND>::y;
    using Lin<P,N,PC_FLOAT_BND>::c;

    Eq(Space& home, bool share, Eq& p);
  public:
    Eq(Home home, ViewArray<P>& x, ViewArray<N>& y, FloatVal c);
    virtual Actor* copy(Space& home, bool share);
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    static ExecStatus
    post(Home home, ViewArray<P>& x, ViewArray<N>& y, FloatVal c);
  };


  template<class P, class N>
  class Lq : public Lin<P,N,PC_FLOAT_BND> {
  protected:
    using Lin<P,N,PC_FLOAT_BND>::x;
    using Lin<P,N,PC_FLOAT_BND>::y;
    using Lin<P,N,PC_FLOAT_BND>::c;

    Lq(Space& home, bool share, Lq& p);
  public:
    Lq(Home home, ViewArray<P>& x, ViewArray<N>& y, FloatVal c);
    virtual Actor* copy(Space& home, bool share);
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    static ExecStatus
    post(Home home, ViewArray<P>& x, ViewArray<N>& y, FloatVal c);
  };

}}}

#include <gecode/float/linear/nary.hpp>

namespace Gecode { namespace Float { namespace Linear {

  class Term {
  public:
    FloatVal a;
    FloatView x;
  };

  GECODE_FLOAT_EXPORT void
  estimate(Term* t, int n, FloatVal c, FloatNum& l, FloatNum& u);

  GECODE_FLOAT_EXPORT void
  post(Home home, Term* t, int n, FloatRelType frt, FloatVal c);

  GECODE_FLOAT_EXPORT void
  post(Home home, Term* t, int n, FloatRelType frt, FloatVal c, Reify r);

}}}

#endif

// STATISTICS: float-prop