/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Guido Tack <tack@gecode.org>
 *  
 *  Contributing authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Guido Tack, 2006
 *     Christian Schulte, 2007
 *
 *  Last modified:
 *     $Date: 2008-02-26 11:08:59 +0100 (Tue, 26 Feb 2008) $ by $Author: tack $
 *     $Revision: 6312 $
 *
 *  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.
 *
 */

namespace Gecode {

  /*
   * Operations for set expression code
   *
   */

  forceinline
  SetExprCode::Stream::Stream(void) : n(0) {}

  forceinline void 
  SetExprCode::Stream::add(int i) {
    is[n++] = i;
  }

  forceinline int 
  SetExprCode::Stream::size(void) const {
    return n;
  }

  forceinline int 
  SetExprCode::Stream::operator[](int i) const {
    return is[i];
  }

 

  forceinline
  SetExprCode::SetExprCode(void) {}

  forceinline
  SetExprCode::SetExprCode(const SetExprCode::Stream& s) 
    : c(s.size()) {
    for (int i=s.size(); i--; )
      c[i]=s[i];
  }

  forceinline
  SetExprCode::SetExprCode(const SetExprCode& sc) : c(sc.c) {}

  forceinline void
  SetExprCode::update(Space* home, bool share, SetExprCode& sc) {
    c.update(home, share, sc.c);
  }
  
  forceinline int
  SetExprCode::size(void) const { return c.size(); }

  forceinline int
  SetExprCode::operator[](int i) const { return c[i]; }


  /*
   * Operations for expressions
   *
   */

  forceinline
  SetExpr::SetExpr(void) : ax(NULL), sign(1) {}

}

inline Gecode::SetExpr
operator-(const Gecode::SetExpr& s) { return Gecode::SetExpr(s, -1); }

inline Gecode::SetExpr
operator||(const Gecode::SetExpr& s, const Gecode::SetExpr& t) {
  return Gecode::SetExpr(s, 1, Gecode::SetExpr::REL_UNION, t, 1);
}

inline Gecode::SetExpr
operator&&(const Gecode::SetExpr& s, const Gecode::SetExpr& t) {
  return Gecode::SetExpr(s, 1, Gecode::SetExpr::REL_INTER, t, 1);
}

inline Gecode::SetExpr
operator-(const Gecode::SetExpr& s, const Gecode::SetExpr& t) {
  return Gecode::SetExpr(s, 1, Gecode::SetExpr::REL_INTER, t, -1);
}

namespace Gecode {

  /**
   * \brief Range iterator for set expressions
   */
  class SetExprRanges {
  private:
    /// Reference-counted range iterators with virtual member functions
    class Iter;
    /// The actual iterator
    Iter *i;
    const SetExprRanges& operator=(const SetExprRanges&);
  public:
    /// \name Constructors and destructor
    //@{    
    /// Copy constructor
    SetExprRanges(const SetExprRanges&);
    /** Initialize with the views \a x, a set expression \a s,
     *  and a flag whether \a s is to be interpreted in a monotone or
     *  anti-monotone way
     */
    SetExprRanges(const ViewArray<Set::SetView>& x, SetExpr& s,
                  bool monotone);
    /** Initialize with the views \a x, a set expression code \a c,
     *  and a flag whether \a c is to be interpreted in a monotone or
     *  anti-monotone way
     */
    SetExprRanges(const ViewArray<Set::SetView>& x,
                  const SetExprCode& s,
                  bool monotone);
    /// Destructor
    ~SetExprRanges(void);
    //@}

    /// \name Iteration control
    //@{
    /// Move iterator to next range (if possible)
    bool operator()(void);
    /// Test whether iterator is still at a range or done
    void operator++(void);
    //@}

    /// \name Range access
    //@{
    /// Return smallest value of range
    int min(void) const;
    /// Return largest value of range
    int max(void) const;
    /// Return width of range (distance between minimum and maximum)
    unsigned int width(void) const;
    //@}
  };

  /**
   * \brief Reference-counted range iterators with virtual member functions
   *
   */
  class SetExprRanges::Iter {
  public:
    /// The actual iterator
    Gecode::Iter::Ranges::Virt::Iterator* i;
    /// Reference count
    int num;

    /// Construct from iterator
    Iter(Gecode::Iter::Ranges::Virt::Iterator*);
    /// Destructor
    ~Iter(void);
    /// Increment reference count
    void increment(void);
    /// Decrement reference count
    bool decrement(void);
  };

  forceinline
  SetExprRanges::Iter::Iter(Gecode::Iter::Ranges::Virt::Iterator* i0)
    : i(i0), num(1) {}
  
  forceinline
  SetExprRanges::Iter::~Iter(void) { delete i; }

  forceinline void
  SetExprRanges::Iter::increment(void) { ++num; }

  forceinline bool
  SetExprRanges::Iter::decrement(void) { return --num==0; }

  forceinline
  SetExprRanges::SetExprRanges(const SetExprRanges& s) : i(s.i) {
    i->increment();
  }

  forceinline
  SetExprRanges::~SetExprRanges(void) {
    if (i->decrement())
      delete i;
  }

  forceinline bool
  SetExprRanges::operator()(void) { return (*(i->i))(); }
  
  forceinline void
  SetExprRanges::operator++(void) { ++(*(i->i)); }

  forceinline int
  SetExprRanges::min(void) const { return i->i->min(); }

  forceinline int
  SetExprRanges::max(void) const { return i->i->max(); }

  forceinline unsigned int
  SetExprRanges::width(void) const { return i->i->width(); }

}

// STATISTICS: set-prop