text: /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
  /*
   *  Main authors:
   *     Christopher Mears <Chris.Mears@monash.edu>
   *
   *  Contributing authors:
   *     Christian Schulte <schulte@gecode.org>
   *     Guido Tack <tack@gecode.org>
   *
   *  Copyright:
   *     Christopher Mears, 2011
   *     Christian Schulte, 2011
   *     Guido Tack, 2011
   *
   *  Last modified:
   *     $Date: 2011-07-12 12:49:06 +0200 (ti, 12 jul 2011) $ by $Author: tack $
   *     $Revision: 12172 $
   *
   *  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,
   *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
   *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
   *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   */
  
  #ifndef __GECODE_SET_PRECEDE_HH__
  #define __GECODE_SET_PRECEDE_HH__
  
  #include <gecode/set.hh>
  
  /**
   * \namespace Gecode::Set::Precede
   * \brief Value precedence propagators
   */
  
  namespace Gecode { namespace Set { namespace Precede {
      
    /**
     * \brief Single value precedence propagator
     *
     * The propagator is based on: Yat Chiu Law and Jimmy H.M. Lee,
     * Global Constraints for Integer and Set Value Precedence,
     * CP 2004, 362--376.
     *
     * Requires \code #include <gecode/set/precede.hh> \endcode
     * \ingroup FuncIntProp
     */
    template<class View>
    class Single : public NaryPropagator<View,PC_SET_NONE> {
    protected:
      using NaryPropagator<View,PC_SET_NONE>::x;
      /// %Advisors for views (by position in array)
      class Index : public Advisor {
      public:
        /// The position of the view in the view array
        int i;
        /// Create index advisor
        Index(Space& home, Propagator& p, Council<Index>& c, int i);
        /// Clone index advisor \a a
        Index(Space& home, bool share, Index& a);
      };
      /// The advisor council
      Council<Index> c;
      /// The value \a s must precede \a t
      int s, t;
      /// Pointers updated during propagation
      int alpha, beta, gamma;
      /// Update the alpha pointer
      ExecStatus updateAlpha(Space& home);
      /// Update the beta pointer
      ExecStatus updateBeta(Space& home);
      /// Constructor for posting
      Single(Home home, ViewArray<View>& x, int s, int t, int beta, int gamma);
      /// Constructor for cloning \a p
      Single(Space& home, bool share, Single<View>& p);
    public:
      /// Copy propagator during cloning
      virtual Propagator* copy(Space& home, bool share);
      /// Cost function
      virtual PropCost cost(const Space&, const ModEventDelta&) const;
      /// Delete propagator and return its size
      virtual size_t dispose(Space& home);
      /// Give advice to propagator
      virtual ExecStatus advise(Space& home, Advisor& a, const Delta& d);
      /// Perform propagation
      virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
      /// Post propagator that \a s precedes \a t in \a x
      static ExecStatus post(Home home, ViewArray<View>& x, int s, int t);
    };
  
  }}}
  
  #include <gecode/set/precede/single.hpp>
  
  #endif
  
  // STATISTICS: set-prop
  