/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *     Guido Tack <tack@gecode.org>
 *
 *  Copyright:
 *     Guido Tack, 2004
 *     Christian Schulte, 2005
 *
 *  Last modified:
 *     $Date: 2006-08-04 16:05:50 +0200 (Fri, 04 Aug 2006) $ by $Author: schulte $
 *     $Revision: 3515 $
 *
 *  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 Iter { namespace Ranges {

  /**
   * \brief Range iterator for computing the complement (described by template arguments)
   *
   * The complement is computed with respect to a given universe set
   * provided as template arguments (\a UMIN ... \a UMAX). The universe
   * must always be a superset!
   *
   * Requires \code #include "gecode/iter.hh" \endcode
   * \ingroup FuncIterRanges
   */

  template <int UMIN, int UMAX, class I>
  class Compl : public MinMax {
  protected:
    /// Iterator to compute complement for
    I i;
    /// Initialize
    void start(void);
  public:
    /// \name Constructors and initialization
    //@{
    /// Default constructor
    Compl(void);
    /// Initialize with iterator \a i
    Compl(I& i);
    /// Initialize with iterator \a i
    void init(I& i);
    //@}

    /// \name Iteration control
    //@{
    /// Move iterator to next range (if possible)
    void operator++(void);
    //@}
  };


  /**
   * \brief Range iterator for computing the complement (described by values)
   *
   * The complement is computed with respect to a given universe set
   * provided as arguments upon initialization. The universe
   * must always be a superset!
   *
   * Requires \code #include "gecode/iter.hh" \endcode
   * \ingroup FuncIterRanges
   */

  template <class I>
  class ComplVal : public MinMax {
  protected:
    /// Values describing the universe set
    int UMIN, UMAX;
    /// Iterator to compute complement for
    I i;
    /// Initialize
    void start(void);
  public:
    /// \name Constructors and initialization
    //@{
    /// Default constructor
    ComplVal(void);
    /// Initialize with iterator \a i
    ComplVal(int umin, int umax, I& i);
    /// Initialize with iterator \a i
    void init(int umin, int umax, I& i);
    //@}

    /// \name Iteration control
    //@{
    /// Move iterator to next range (if possible)
    void operator++(void);
    //@}
  };


  template <int UMIN, int UMAX, class I>
  forceinline void
  Compl<UMIN,UMAX,I>::start(void) {
    if (i()) {
      assert((i.min() >= UMIN) && (i.max() <= UMAX));
      if (i.min() > UMIN) {
	mi = UMIN;
	ma = i.min()-1;
      } else if (i.max() < UMAX) {
	mi = i.max()+1;
	++i;
	ma = i() ? (i.min()-1) : UMAX;
      } else {
	finish();
      }
    } else {
      mi = UMIN;
      ma = UMAX;
    }
  }

  template <int UMIN, int UMAX, class I>
  forceinline
  Compl<UMIN,UMAX,I>::Compl(void) {}

  template <int UMIN, int UMAX, class I>
  forceinline
  Compl<UMIN,UMAX,I>::Compl(I& i0) : i(i0) {
    start();
  }

  template <int UMIN, int UMAX, class I>
  forceinline void
  Compl<UMIN,UMAX,I>::init(I& i0) {
    i=i0; start();
  }

  template <int UMIN, int UMAX, class I>
  forceinline void
  Compl<UMIN,UMAX,I>::operator++(void) {
    assert(!i() || (i.max() <= UMAX));
    if (i() && (i.max() < UMAX)) {
      mi = i.max()+1;
      ++i;
      ma = i() ? (i.min()-1) : UMAX;
    } else {
      finish();
    }
  }

  template <class I>
  forceinline void
  ComplVal<I>::start(void) {
    if (i()) {
      assert((i.min() >= UMIN) && (i.max() <= UMAX));
      if (i.min() > UMIN) {
	mi = UMIN;
	ma = i.min()-1;
      } else if (i.max() < UMAX) {
	mi = i.max()+1;
	++i;
	ma = i() ? (i.min()-1) : UMAX;
      } else {
	finish();
      }
    } else {
      mi = UMIN;
      ma = UMAX;
    }
  }

  template <class I>
  forceinline
  ComplVal<I>::ComplVal(void) {}

  template <class I>
  forceinline
  ComplVal<I>::ComplVal(int umin, int umax, I& i0)
    : UMIN(umin), UMAX(umax), i(i0) {
    start();
  }

  template <class I>
  forceinline void
  ComplVal<I>::init(int umin, int umax, I& i0) {
    UMIN=umin; UMAX=umax; i=i0; start();
  }

  template <class I>
  forceinline void
  ComplVal<I>::operator++(void) {
    assert(!i() || (i.max() <= UMAX));
    if (i() && (i.max() < UMAX)) {
      mi = i.max()+1;
      ++i;
      ma = i() ? (i.min()-1) : UMAX;
    } else {
      finish();
    }
  }

}}}

// STATISTICS: iter-any