This file is indexed.

/usr/include/gecode/int/rel.hh is in libgecode-dev 4.2.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *     Guido Tack <tack@gecode.org>
 *
 *  Contributing authors:
 *     Gabor Szokoli <szokoli@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2002
 *     Guido Tack, 2004
 *     Gabor Szokoli, 2003
 *
 *  Last modified:
 *     $Date: 2011-11-18 16:02:48 +0100 (Fri, 18 Nov 2011) $ by $Author: schulte $
 *     $Revision: 12472 $
 *
 *  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.
 *
 */

#ifndef __GECODE_INT_REL_HH__
#define __GECODE_INT_REL_HH__

#include <gecode/int.hh>

/**
 * \namespace Gecode::Int::Rel
 * \brief Simple relation propagators
 */

namespace Gecode { namespace Int { namespace Rel {

  /*
   * Equality propagators
   *
   */

  /**
   * \brief Binary domain consistent equality propagator
   *
   * Uses staging by first performing bounds propagation and only
   * then domain propagation.
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View0,class View1>
  class EqDom :
    public MixBinaryPropagator<View0,PC_INT_DOM,View1,PC_INT_DOM> {
  protected:
    using MixBinaryPropagator<View0,PC_INT_DOM,View1,PC_INT_DOM>::x0;
    using MixBinaryPropagator<View0,PC_INT_DOM,View1,PC_INT_DOM>::x1;

    /// Constructor for cloning \a p
    EqDom(Space& home, bool share, EqDom<View0,View1>& p);
  public:
    /// Constructor for posting
    EqDom(Home home, View0 x0, View1 x1);
    /// Constructor for rewriting \a p during cloning
    EqDom(Space& home, bool share, Propagator& p, View0 x0, View1 x1);
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /**
     * \brief Cost function
     *
     * If a view has been assigned, the cost is low unary.
     * If in stage for bounds propagation, the cost is
     * low binary. Otherwise it is high binary.
     */
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post domain consistent propagator \f$ x_0 = x_1\f$
    static  ExecStatus post(Home home, View0 x0, View1 x1);
  };

  /**
   * \brief Binary bounds consistent equality propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View0, class View1>
  class EqBnd :
    public MixBinaryPropagator<View0,PC_INT_BND,View1,PC_INT_BND> {
  protected:
    using MixBinaryPropagator<View0,PC_INT_BND,View1,PC_INT_BND>::x0;
    using MixBinaryPropagator<View0,PC_INT_BND,View1,PC_INT_BND>::x1;

    /// Constructor for cloning \a p
    EqBnd(Space& home, bool share, EqBnd<View0,View1>& p);
  public:
    /// Constructor for posting
    EqBnd(Home home, View0 x0, View1 x1);
    /// Constructor for rewriting \a p during cloning
    EqBnd(Space& home, bool share, Propagator& p, View0 x0, View1 x1);
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post bounds consistent propagator \f$ x_0 = x_1\f$
    static  ExecStatus post(Home home, View0 x0, View1 x1);
  };

  /**
   * \brief n-ary domain consistent equality propagator
   *
   * Uses staging by first performing bounds propagation and only
   * then domain propagation.
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View>
  class NaryEqDom : public NaryPropagator<View,PC_INT_DOM> {
  protected:
    using NaryPropagator<View,PC_INT_DOM>::x;

    /// Constructor for cloning \a p
    NaryEqDom(Space& home, bool share, NaryEqDom<View>& p);
    /// Constructor for posting
    NaryEqDom(Home home, ViewArray<View>&);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /**
     * \brief Cost function
     *
     * If a view has been assigned, the cost is low unary.
     * If in stage for bounds propagation, the cost is
     * low linear. Otherwise it is high linear.
     */
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post domain consistent propagator \f$ x_0 = x_1=\ldots =x_{|x|-1}\f$
    static  ExecStatus post(Home home, ViewArray<View>& x);
  };

  /**
   * \brief n-ary bounds consistent equality propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View>
  class NaryEqBnd : public NaryPropagator<View,PC_INT_BND> {
  protected:
    using NaryPropagator<View,PC_INT_BND>::x;

    /// Constructor for cloning \a p
    NaryEqBnd(Space& home, bool share, NaryEqBnd<View>& p);
    /// Constructor for posting
    NaryEqBnd(Home home, ViewArray<View>&);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /**
     * \brief Cost function
     *
     * If a view has been assigned, the cost is low unary.
     * Otherwise it is low linear.
     */
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post bounds consistent propagator \f$ x_0 = x_1=\ldots =x_{|x|-1}\f$
    static  ExecStatus post(Home home, ViewArray<View>& x);
  };

  /**
   * \brief n-ary less and less or equal propagator
   *
   * If \a o is 0, less or equal is propagated, if \a o is 1 less is
   * propagated.
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View, int o>
  class NaryLqLe : public NaryPropagator<View,PC_INT_NONE> {
  protected:
    using NaryPropagator<View,PC_INT_NONE>::x;
    /// %Advisors for views (by position in array)
    class Index : public Advisor {
    public:
      /// The position of the view in the view array
      int i;
      /// Create index advisor
      Index(Space& home, Propagator& p, Council<Index>& c, int i);
      /// Clone index advisor \a a
      Index(Space& home, bool share, Index& a);
    };
    /// The advisor council
    Council<Index> c;
    /// Positions in view array that have to be propagated
    class Pos : public FreeList {
    public:
      /// Position of view in view array
      int p;

      /// \name Constructor
      //@{
      /// Initialize with position \a p and next position \a n
      Pos(int p, Pos* n);
      //@}

      /// \name Linkage access
      //@{
      /// Return next position
      Pos* next(void) const;
      //@}

      /// \name Memory management
      //@{
      /// Free memory for this position
      void dispose(Space& home);

      /// Allocate memory from space
      static void* operator new(size_t s, Space& home);
      /// No-op (for exceptions)
      static void operator delete(void* p);
      /// No-op (use dispose instead)
      static void operator delete(void* p, Space& home);
      //@}
    };
    /// Stack of positions
    Pos* pos;
    /// Whether no more positions must be propagated
    bool empty(void) const;
    /// Pop a position to be propagated and return it
    int pop(Space& home);
    /// Push a new position \a p to be propagated
    void push(Space& home, int p);
    /// Whether the propagator is currently running
    bool run;
    /// Number of already subsumed advisors (or views)
    int n_subsumed;
    /// Compact during cloning when more advisors than that are subsumed
    static const int n_threshold = 7;
    /// Constructor for cloning \a p
    NaryLqLe(Space& home, bool share, NaryLqLe<View,o>& p);
    /// Constructor for posting
    NaryLqLe(Home home, ViewArray<View>&);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Cost function
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    /// Give advice to propagator
    virtual ExecStatus advise(Space& home, Advisor& a, const Delta& d);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Delete propagator and return its size
    virtual size_t dispose(Space& home);
    /// Post propagator for \f$ x_0 +c\leq x_1+c\leq\cdots \leq x_{|x|-1}\f$
    static ExecStatus post(Home home, ViewArray<View>& x);
  };

  /**
   * \brief Nary disequality propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View>
  class NaryNq : public NaryPropagator<View,PC_INT_VAL> {
  protected:
    using NaryPropagator<View,PC_INT_VAL>::x;
    /// Constructor for posting
    NaryNq(Home home, ViewArray<View>& x);
    /// Constructor for cloning \a p
    NaryNq(Space& home, bool share, NaryNq<View>& p);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Cost function
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post propagator \f$ \neg\left(x_0=x_1=\cdots=x_{|x|-1}\right)\f$
    static  ExecStatus post(Home home, ViewArray<View>& x);
    /// Delete propagator and return its size
    virtual size_t dispose(Space& home);
  };


  /**
   * \brief Reified binary domain consistent equality propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View, class CtrlView, ReifyMode rm>
  class ReEqDom : public ReBinaryPropagator<View,PC_INT_DOM,CtrlView> {
  protected:
    using ReBinaryPropagator<View,PC_INT_DOM,CtrlView>::x0;
    using ReBinaryPropagator<View,PC_INT_DOM,CtrlView>::x1;
    using ReBinaryPropagator<View,PC_INT_DOM,CtrlView>::b;

    /// Constructor for cloning \a p
    ReEqDom(Space& home, bool share, ReEqDom& p);
    /// Constructor for posting
    ReEqDom(Home home, View x0, View x1, CtrlView b);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post domain consistent propagator \f$ (x_0 = x_1)\Leftrightarrow b\f$
    static  ExecStatus post(Home home, View x0, View x1, CtrlView b);
  };

  /**
   * \brief Reified binary bounds consistent equality propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View, class CtrlView, ReifyMode rm>
  class ReEqBnd : public ReBinaryPropagator<View,PC_INT_BND,CtrlView> {
  protected:
    using ReBinaryPropagator<View,PC_INT_BND,CtrlView>::x0;
    using ReBinaryPropagator<View,PC_INT_BND,CtrlView>::x1;
    using ReBinaryPropagator<View,PC_INT_BND,CtrlView>::b;

    /// Constructor for cloning \a p
    ReEqBnd(Space& home, bool share, ReEqBnd& p);
    /// Constructor for posting
    ReEqBnd(Home home, View x0, View x1, CtrlView b);
  public:
    /// Copy propagator during cloning
    virtual Actor*     copy(Space& home, bool share);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post bounds consistent propagator \f$ (x_0 = x_1)\Leftrightarrow b\f$
    static  ExecStatus post(Home home, View x0, View x1, CtrlView b);
  };

  /**
   * \brief Reified domain consistent equality with integer propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View, class CtrlView, ReifyMode rm>
  class ReEqDomInt : public ReUnaryPropagator<View,PC_INT_DOM,CtrlView> {
  protected:
    using ReUnaryPropagator<View,PC_INT_DOM,CtrlView>::x0;
    using ReUnaryPropagator<View,PC_INT_DOM,CtrlView>::b;

    /// Integer constant to check
    int c;
    /// Constructor for cloning \a p
    ReEqDomInt(Space& home, bool share, ReEqDomInt& p);
    /// Constructor for posting
    ReEqDomInt(Home home, View x, int c, CtrlView b);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post domain consistent propagator \f$ (x = c)\Leftrightarrow b\f$
    static  ExecStatus post(Home home, View x, int c, CtrlView b);
  };

  /**
   * \brief Reified bounds consistent equality with integer propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View, class CtrlView, ReifyMode rm>
  class ReEqBndInt : public ReUnaryPropagator<View,PC_INT_BND,CtrlView> {
  protected:
    using ReUnaryPropagator<View,PC_INT_BND,CtrlView>::x0;
    using ReUnaryPropagator<View,PC_INT_BND,CtrlView>::b;

    /// Integer constant to check
    int c;
    /// Constructor for cloning \a p
    ReEqBndInt(Space& home, bool share, ReEqBndInt& p);
    /// Constructor for posting
    ReEqBndInt(Home home, View x, int c, CtrlView b);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post bounds consistent propagator \f$ (x = c)\Leftrightarrow b\f$
    static  ExecStatus post(Home home, View x, int c, CtrlView b);
  };




  /*
   * Disequality propagators
   *
   */

  /**
   * \brief Binary disequality propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View>
  class Nq : public BinaryPropagator<View,PC_INT_VAL> {
  protected:
    using BinaryPropagator<View,PC_INT_VAL>::x0;
    using BinaryPropagator<View,PC_INT_VAL>::x1;

    /// Constructor for cloning \a p
    Nq(Space& home, bool share, Nq<View>& p);
    /// Constructor for posting
    Nq(Home home, View x0, View x1);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Cost function (defined as low unary)
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post propagator \f$x_0\neq x_1\f$
    static  ExecStatus post(Home home, View x0, View x1);
  };

  /*
   * Order propagators
   *
   */

  /**
   * \brief Less or equal propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */

  template<class View>
  class Lq : public BinaryPropagator<View,PC_INT_BND> {
  protected:
    using BinaryPropagator<View,PC_INT_BND>::x0;
    using BinaryPropagator<View,PC_INT_BND>::x1;

    /// Constructor for cloning \a p
    Lq(Space& home, bool share, Lq& p);
    /// Constructor for posting
    Lq(Home home, View x0, View x1);
  public:
    /// Copy propagator during cloning
    virtual Actor*     copy(Space& home, bool share);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post propagator \f$x_0 \leq x_1\f$
    static  ExecStatus post(Home home, View x0, View x1);
  };

  /**
   * \brief Less propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View>
  class Le : public BinaryPropagator<View,PC_INT_BND> {
  protected:
    using BinaryPropagator<View,PC_INT_BND>::x0;
    using BinaryPropagator<View,PC_INT_BND>::x1;

    /// Constructor for cloning \a p
    Le(Space& home, bool share, Le& p);
    /// Constructor for posting
    Le(Home home, View x0, View x1);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post propagator \f$x_0 \le x_1\f$
    static  ExecStatus post(Home home, View x0, View x1);
  };


  /*
   * Reified order propagators
   *
   */

  /**
   * \brief Reified less or equal propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */

  template<class View, class CtrlView, ReifyMode rm>
  class ReLq : public ReBinaryPropagator<View,PC_INT_BND,CtrlView> {
  protected:
    using ReBinaryPropagator<View,PC_INT_BND,CtrlView>::x0;
    using ReBinaryPropagator<View,PC_INT_BND,CtrlView>::x1;
    using ReBinaryPropagator<View,PC_INT_BND,CtrlView>::b;

    /// Constructor for cloning \a p
    ReLq(Space& home, bool share, ReLq& p);
    /// Constructor for posting
    ReLq(Home home, View x0, View x1, CtrlView b);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post propagator for \f$ (x_0 \leq x_1)\Leftrightarrow b\f$
    static  ExecStatus post(Home home, View x0, View x1, CtrlView b);
  };

  /**
   * \brief Reified less or equal with integer propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */

  template<class View, class CtrlView, ReifyMode rm>
  class ReLqInt : public ReUnaryPropagator<View,PC_INT_BND,CtrlView> {
  protected:
    using ReUnaryPropagator<View,PC_INT_BND,CtrlView>::x0;
    using ReUnaryPropagator<View,PC_INT_BND,CtrlView>::b;

    /// Integer constant to check
    int c;
    /// Constructor for cloning \a p
    ReLqInt(Space& home, bool share, ReLqInt& p);
    /// Constructor for posting
    ReLqInt(Home home, View x, int c, CtrlView b);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post propagator for \f$ (x \leq c)\Leftrightarrow b\f$
    static  ExecStatus post(Home home, View x, int c, CtrlView b);
   };





  /**
   * \brief Lexical ordering propagator
   *
   * The propagator uses the algorithm (and also the automaton)
   * from:
   *   Mats Carlsson, Nicolas Beldiceanu, Revisiting the
   *   Lexicographic Ordering Constraint. SICS Technical
   *   Report T2002:17, SICS, Sweden, 2002.
   *
   * It deviates in the following two main aspects:
   *  - Assigned variables are eagerly eliminated
   *    This yields the same incremental behaviour with
   *    respect to states 1 and 2 of the automaton.
   *    With respect to the values of \a q and \a r in the report:
   *     - \a q is always 0 after elimination
   *     - \a r is always 1 after elimination
   *
   *  - It is not incremental with respect to states 3 and 4
   *    as no propagation event information is available
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View>
  class LexLqLe : public Propagator {
  protected:
    /// View arrays
    ViewArray<View> x, y;
    /// Determines whether propagator is strict or not
    bool strict;
    /// Constructor for cloning \a p
    LexLqLe(Space& home, bool share, LexLqLe<View>& p);
    /// Constructor for posting
    LexLqLe(Home home, ViewArray<View>& x, ViewArray<View>& y, bool strict);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Cost function (defined as low linear)
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post propagator for lexical order between \a x and \a y
    static ExecStatus post(Home home, ViewArray<View>& x, ViewArray<View>& y,
                           bool strict);
    /// Delete propagator and return its size
    virtual size_t dispose(Space& home);
  };

  /**
   * \brief Lexical disequality propagator
   *
   * Requires \code #include <gecode/int/rel.hh> \endcode
   * \ingroup FuncIntProp
   */
  template<class View>
  class LexNq : public Propagator {
  protected:
    /// Views currently subscribed to
    View x0, y0, x1, y1;
    /// Views not yet subscribed to
    ViewArray<View> x, y;
    /// Update subscription
    ExecStatus resubscribe(Space& home, 
                           RelTest rt, View& x0, View& y0, View x1, View y1);
    /// Constructor for posting
    LexNq(Home home, ViewArray<View>& x, ViewArray<View>& y);
    /// Constructor for cloning \a p
    LexNq(Space& home, bool share, LexNq<View>& p);
  public:
    /// Copy propagator during cloning
    virtual Actor* copy(Space& home, bool share);
    /// Cost function
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    /// Perform propagation
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    /// Post propagator \f$ x\neq y\f$
    static  ExecStatus post(Home home, ViewArray<View>& x, ViewArray<View>& y);
    /// Delete propagator and return its size
    virtual size_t dispose(Space& home);
  };

}}}

#include <gecode/int/rel/eq.hpp>
#include <gecode/int/rel/nq.hpp>
#include <gecode/int/rel/lq-le.hpp>
#include <gecode/int/rel/lex.hpp>

#endif


// STATISTICS: int-prop