/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2003
 *
 *  Last modified:
 *     $Date: 2006-08-24 11:25:05 +0200 (Thu, 24 Aug 2006) $ by $Author: schulte $
 *     $Revision: 3559 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  See the file "LICENSE" for information on usage and
 *  redistribution of this file, and for a
 *     DISCLAIMER OF ALL WARRANTIES.
 *
 */

namespace Gecode {

  namespace Int {

    /*
     * Constructors and initialization
     *
     */
    forceinline
    ConstIntView::ConstIntView(void) {}
    forceinline
    ConstIntView::ConstIntView(int n) : x(n) {}
    forceinline void
    ConstIntView::init(int n) {
      x=n;
    }


    /*
     * Value access
     *
     */
    forceinline int
    ConstIntView::min(void) const {
      return x;
    }
    forceinline int
    ConstIntView::max(void) const {
      return x;
    }
    forceinline int
    ConstIntView::med(void) const {
      return x;
    }
    forceinline int
    ConstIntView::val(void) const {
      return x;
    }

    forceinline unsigned int
    ConstIntView::size(void) const {
      return 1;
    }
    forceinline unsigned int
    ConstIntView::width(void) const {
      return 1;
    }
    forceinline unsigned int
    ConstIntView::regret_min(void) const {
      return 0;
    }
    forceinline unsigned int
    ConstIntView::regret_max(void) const {
      return 0;
    }


    /*
     * Domain tests
     *
     */
    forceinline bool
    ConstIntView::range(void) const {
      return true;
    }
    forceinline bool
    ConstIntView::assigned(void) const {
      return true;
    }

    forceinline bool
    ConstIntView::in(int n) const {
      return n == x;
    }
    forceinline bool
    ConstIntView::in(double n) const {
      return n == x;
    }


    /*
     * Domain update by value
     *
     */
    forceinline ModEvent
    ConstIntView::lq(Space*, int n) {
      return (x <= n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ConstIntView::lq(Space*, double n) {
      return (x <= n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ConstIntView::le(Space*, int n) {
      return (x < n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ConstIntView::le(Space*, double n) {
      return (x < n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ConstIntView::gq(Space*, int n) {
      return (x >= n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ConstIntView::gq(Space*, double n) {
      return (x >= n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ConstIntView::gr(Space*, int n) {
      return (x > n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ConstIntView::gr(Space*, double n) {
      return (x > n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ConstIntView::nq(Space*, int n) {
      return (x != n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ConstIntView::nq(Space*, double n) {
      return (x != n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ConstIntView::eq(Space*, int n) {
      return (x == n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ConstIntView::eq(Space*, double n) {
      return (x == n) ? ME_INT_NONE : ME_INT_FAILED;
    }



    /*
     * Domain update by range iterator
     *
     */
    template <class I>
    forceinline ModEvent
    ConstIntView::narrow(Space*, I& i) {
      return i() ? ME_INT_NONE : ME_INT_FAILED;
    }
    template <class I>
    ModEvent
    ConstIntView::inter(Space*, I& i) {
      while (i() && (i.max() < x)) ++i;
      return (i() && (i.min() <= x)) ? ME_INT_NONE : ME_INT_FAILED;
    }
    template <class I>
    ModEvent
    ConstIntView::minus(Space*, I& i) {
      while (i() && (i.max() < x)) ++i;
      return (i() && (i.min() <= x)) ? ME_INT_FAILED : ME_INT_NONE;
    }



    /*
     * Propagator modification events
     *
     */
    forceinline ModEvent
    ConstIntView::pme(const Propagator*) {
      return ME_INT_NONE;
    }
    forceinline PropModEvent
    ConstIntView::pme(ModEvent me) {
      return static_cast<PropModEvent>(me);
    }


    /*
     * Dependencies
     *
     */
    forceinline void
    ConstIntView::subscribe(Space*,Propagator*,PropCond,bool) {}
    forceinline void
    ConstIntView::cancel(Space* home, Propagator*,PropCond) {}



    /*
     * Cloning
     *
     */
    forceinline void
    ConstIntView::update(Space*, bool, ConstIntView& y) {
      x = y.x;
    }

    /**
     * \brief %Range iterator for constant integer views
     * \ingroup TaskActorIntView
     */
    template <>
    class ViewRanges<ConstIntView> {
    private:
      /// The single integer to iterate
      int n;
    public:
      /// \name Constructors and initialization
      //@{
      /// Default constructor
      ViewRanges(void);
      /// Initialize with ranges for view \a x
      ViewRanges(const ConstIntView& x);
      /// Initialize with ranges for view \a x
      void init(const ConstIntView& x);
      //@}

      /// \name Iteration control
      //@{
      /// Test whether iterator is still at a range or done
      bool operator()(void) const;
      /// Move iterator to next range (if possible)
      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 ranges (distance between minimum and maximum)
      unsigned int width(void) const;
      //@}
    };

    forceinline
    ViewRanges<ConstIntView>::ViewRanges(void) {}

    forceinline
    ViewRanges<ConstIntView>::ViewRanges(const ConstIntView& x)
      : n(x.val()) {}

    forceinline bool
    ViewRanges<ConstIntView>::operator()(void) const {
      return n < Limits::Int::int_max;
    }
    forceinline void
    ViewRanges<ConstIntView>::operator++(void) {
      n = Limits::Int::int_max;
    }

    forceinline int
    ViewRanges<ConstIntView>::min(void) const {
      return n;
    }
    forceinline int
    ViewRanges<ConstIntView>::max(void) const {
      return n;
    }
    forceinline unsigned int
    ViewRanges<ConstIntView>::width(void) const {
      return 1;
    }

  }

  /*
   * View comparison
   *
   */
  forceinline bool
  same(const Int::ConstIntView& x, const Int::ConstIntView& y) {
    return x.min() == y.min();
  }
  forceinline bool
  before(const Int::ConstIntView& x, const Int::ConstIntView& y) {
    return x.min() < y.min();
  }

}

// STATISTICS: int-var