zero.icc

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2003
 *
 *  Last modified:
 *     $Date: 2008-01-24 13:05:13 +0100 (Thu, 24 Jan 2008) $ by $Author: tack $
 *     $Revision: 5974 $
 *
 *  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 {

  namespace Int {

    /*
     * Constructors and initialization
     *
     */
    forceinline
    ZeroIntView::ZeroIntView(void) {}
    forceinline void
    ZeroIntView::init(void) {}
    forceinline
    ZeroIntView::ZeroIntView(Space*, const Reflection::VarMap&,
                             Reflection::Arg*) {}

    /*
     * Value access
     *
     */
    forceinline int
    ZeroIntView::min(void) const {
      return 0;
    }
    forceinline int
    ZeroIntView::max(void) const {
      return 0;
    }
    forceinline int
    ZeroIntView::med(void) const {
      return 0;
    }
    forceinline int
    ZeroIntView::val(void) const {
      return 0;
    }

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


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

    forceinline bool
    ZeroIntView::in(int n) const {
      return n == 0;
    }
    forceinline bool
    ZeroIntView::in(double n) const {
      return n == 0;
    }


    /*
     * Domain update by value
     *
     */
    forceinline ModEvent
    ZeroIntView::lq(Space*, int n) {
      return (0 <= n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ZeroIntView::lq(Space*, double n) {
      return (0 <= n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ZeroIntView::le(Space*, int n) {
      return (0 < n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ZeroIntView::le(Space*, double n) {
      return (0 < n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ZeroIntView::gq(Space*, int n) {
      return (0 >= n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ZeroIntView::gq(Space*, double n) {
      return (0 >= n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ZeroIntView::gr(Space*, int n) {
      return (0 > n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ZeroIntView::gr(Space*, double n) {
      return (0 > n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ZeroIntView::nq(Space*, int n) {
      return (0 != n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ZeroIntView::nq(Space*, double n) {
      return (0 != n) ? ME_INT_NONE : ME_INT_FAILED;
    }

    forceinline ModEvent
    ZeroIntView::eq(Space*, int n) {
      return (0 == n) ? ME_INT_NONE : ME_INT_FAILED;
    }
    forceinline ModEvent
    ZeroIntView::eq(Space*, double n) {
      return (0 == n) ? ME_INT_NONE : ME_INT_FAILED;
    }



    /*
     * Iterator-based domain update
     *
     */
    template <class I>
    forceinline ModEvent
    ZeroIntView::narrow_r(Space* home, I& i, bool) {
      return i() ? ME_INT_NONE : ME_INT_FAILED;
    }
    template <class I>
    forceinline ModEvent
    ZeroIntView::inter_r(Space* home, I& i, bool) {
      while (i() && (i.max() < 0)) 
        ++i;
      return (i() && (i.min() <= 0)) ? ME_INT_NONE : ME_INT_FAILED;
    }
    template <class I>
    forceinline ModEvent
    ZeroIntView::minus_r(Space* home, I& i, bool) {
      while (i() && (i.max() < 0)) 
        ++i;
      return (i() && (i.min() <= 0)) ? ME_INT_FAILED : ME_INT_NONE;
    }
    template <class I>
    forceinline ModEvent
    ZeroIntView::narrow_v(Space* home, I& i, bool) {
      return i() ? ME_INT_NONE : ME_INT_FAILED;
    }
    template <class I>
    forceinline ModEvent
    ZeroIntView::inter_v(Space* home, I& i, bool) {
      while (i() && (i.val() < 0)) 
        ++i;
      return (i() && (i.val() == 0)) ? ME_INT_NONE : ME_INT_FAILED;
    }
    template <class I>
    forceinline ModEvent
    ZeroIntView::minus_v(Space* home, I& i, bool) {
      while (i() && (i.val() < 0)) 
        ++i;
      return (i() && (i.val() == 0)) ? ME_INT_FAILED : ME_INT_NONE;
    }


    /*
     * Propagator modification events
     *
     */
    forceinline void
    ZeroIntView::schedule(Space* home, Propagator* p, ModEvent me) {
      return IntView::schedule(home,p,me);
    }
    forceinline ModEvent
    ZeroIntView::me(ModEventDelta) {
      return ME_INT_NONE;
    }
    forceinline ModEventDelta
    ZeroIntView::med(ModEvent me) {
      return static_cast<ModEventDelta>(me);
    }


    /*
     * Dependencies
     *
     */
    forceinline void
    ZeroIntView::subscribe(Space* home, Propagator* p, PropCond,bool) {
      schedule(home,p,ME_INT_VAL);
    }
    forceinline void
    ZeroIntView::cancel(Space*,Propagator*,PropCond) {}
    forceinline void
    ZeroIntView::subscribe(Space*, Advisor*) {}
    forceinline void
    ZeroIntView::cancel(Space*,Advisor*) {}



    /*
     * Delta information for advisors
     *
     */
    forceinline ModEvent
    ZeroIntView::modevent(const Delta*) {
      return ME_INT_NONE;
    }
    forceinline int
    ZeroIntView::min(const Delta*) const {
      return 1;
    }
    forceinline int
    ZeroIntView::max(const Delta*) const {
      return 0;
    }
    forceinline bool
    ZeroIntView::any(const Delta*) const {
      return true;
    }



    /*
     * Cloning
     *
     */
    forceinline void
    ZeroIntView::update(Space*, bool, ZeroIntView&) {}

    /*
     * Serialization
     *
     */
    forceinline Reflection::Arg*
    ZeroIntView::spec(const Space*, Reflection::VarMap&) const {
      return Reflection::Arg::newInt(0);
    }
    inline Support::Symbol
    ZeroIntView::type(void) {
      return Support::Symbol("ConstIntView");
    }

    template <>
    class ViewRanges<ZeroIntView> {
    private:
      bool done;
    public:


      ViewRanges(void);
      ViewRanges(const ZeroIntView& x);
      void init(const ZeroIntView& x);



      bool operator()(void) const;
      void operator++(void);



      int min(void) const;
      int max(void) const;
      unsigned int width(void) const;
    };

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

    forceinline
    ViewRanges<ZeroIntView>::ViewRanges(const ZeroIntView&)
      : done(false) {}

    forceinline bool
    ViewRanges<ZeroIntView>::operator()(void) const {
      return !done;
    }
    forceinline void
    ViewRanges<ZeroIntView>::operator++(void) {
      done=true;
    }

    forceinline int
    ViewRanges<ZeroIntView>::min(void) const {
      return 0;
    }
    forceinline int
    ViewRanges<ZeroIntView>::max(void) const {
      return 0;
    }
    forceinline unsigned int
    ViewRanges<ZeroIntView>::width(void) const {
      return 1;
    }

  }

  /*
   * View comparison
   *
   */
  forceinline bool
  same(const Int::ZeroIntView&, const Int::ZeroIntView&) {
    return true;
  }
  forceinline bool
  before(const Int::ZeroIntView&, const Int::ZeroIntView&) {
    return false;
  }

}

// STATISTICS: int-var