afc.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2013
 *
 *  Last modified:
 *     $Date: 2014-05-27 14:57:59 +0200 (Tue, 27 May 2014) $ by $Author: schulte $
 *     $Revision: 14124 $
 *
 *  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:
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 *  included in all copies or substantial portions of the Software.
 *
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 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

namespace Gecode {

  class AFC {
  protected:
    int n;
  public:


    AFC(void);
    AFC(const AFC& a);
    AFC& operator =(const AFC& a);
    template<class Var>
    AFC(Home home, const VarArgArray<Var>& x, double d);
    template<class Var>
    void init(Home home, const VarArgArray<Var>& x, double d);
    bool initialized(void) const;
    void set(Space& home, double a=1.0);
    GECODE_KERNEL_EXPORT static const AFC def;



    void update(Space& home, bool share, AFC& a);
    ~AFC(void);
    


    int size(void) const;



    void decay(Space& home, double d);
    double decay(const Space& home) const;
  };

  template<class Char, class Traits>
  std::basic_ostream<Char,Traits>&
  operator <<(std::basic_ostream<Char,Traits>& os,
             const AFC& a);

  /*
   * AFC
   *
   */
  forceinline int
  AFC::size(void) const {
    assert(n >= 0);
    return n;
  }

  forceinline
  AFC::AFC(void) : n(-1) {}

  forceinline bool
  AFC::initialized(void) const {
    return n >= 0;
  }

  template<class Var>
  forceinline
  AFC::AFC(Home home, const VarArgArray<Var>& x, double d) 
    : n(x.size()) {
    if ((d < 0.0) || (d > 1.0))
      throw IllegalDecay("AFC");
    static_cast<Space&>(home).afc_decay(d);
  }
  template<class Var>
  forceinline void
  AFC::init(Home home, const VarArgArray<Var>& x, double d) {
    n = x.size();
    if ((d < 0.0) || (d > 1.0))
      throw IllegalDecay("AFC");
    static_cast<Space&>(home).afc_decay(d);
  }

  
  forceinline
  AFC::AFC(const AFC& a)
    : n(a.n) {}
  forceinline AFC&
  AFC::operator =(const AFC& a) {
    n=a.n;
    return *this;
  }
  forceinline
  AFC::~AFC(void) {}

  forceinline void
  AFC::update(Space&, bool, AFC& a) {
    n=a.n;
  }

  forceinline void
  AFC::decay(Space& home, double d) {
    if ((d < 0.0) || (d > 1.0))
      throw IllegalDecay("AFC");
    home.afc_decay(d);
  }

  forceinline void
  AFC::set(Space& home, double a) {
    home.afc_set(a);
  }

  forceinline double
  AFC::decay(const Space& home) const {
    return home.afc_decay();
  }


  template<class Char, class Traits>
  std::basic_ostream<Char,Traits>&
  operator <<(std::basic_ostream<Char,Traits>& os,
              const AFC& a) {
    (void)a;
    return os << "AFC(no information available)";
  }
  
}

// STATISTICS: kernel-branch