Generated on Thu Apr 5 2018 19:44:19 for Gecode by doxygen 1.8.13
view-lq.hpp
Go to the documentation of this file.
1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2003
8  *
9  * Last modified:
10  * $Date$ by $Author$
11  * $Revision$
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
16  *
17  * Permission is hereby granted, free of charge, to any person obtaining
18  * a copy of this software and associated documentation files (the
19  * "Software"), to deal in the Software without restriction, including
20  * without limitation the rights to use, copy, modify, merge, publish,
21  * distribute, sublicense, and/or sell copies of the Software, and to
22  * permit persons to whom the Software is furnished to do so, subject to
23  * the following conditions:
24  *
25  * The above copyright notice and this permission notice shall be
26  * included in all copies or substantial portions of the Software.
27  *
28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
32  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
33  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
34  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35  *
36  */
37 
38 namespace Gecode { namespace Int { namespace Count {
39 
40  template<class VX, class VY, class VZ, bool shr>
43  VY y, VZ z, int c)
44  : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
45 
46  template<class VX, class VY, class VZ, bool shr>
49  VY y, VZ z, int c) {
50  GECODE_ME_CHECK(z.gq(home,-c));
51  if (z.assigned())
52  return LqInt<VX,VY>::post(home,x,y,z.val()+c);
53  if (sharing(x,y,z))
54  (void) new (home) LqView<VX,VY,VZ,true>(home,x,y,z,c);
55  else
56  (void) new (home) LqView<VX,VY,VZ,false>(home,x,y,z,c);
57  return ES_OK;
58  }
59 
60  template<class VX, class VY, class VZ, bool shr>
63  : ViewBase<VX,VY,VZ>(home,p) {}
64 
65  template<class VX, class VY, class VZ, bool shr>
66  Actor*
68  return new (home) LqView<VX,VY,VZ,shr>(home,*this);
69  }
70 
71  template<class VX, class VY, class VZ, bool shr>
74  count(home);
75  GECODE_ME_CHECK(z.gq(home,atleast()));
76 
77  if (z.max() == atleast()) {
79  return home.ES_SUBSUMED(*this);
80  }
81 
82  if (x.size() == 0)
83  return home.ES_SUBSUMED(*this);
84 
85  if (z.assigned()) {
86  VY yc(y);
87  GECODE_REWRITE(*this,(LqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
88  }
89 
90  return shr ? ES_NOFIX : ES_FIX;
91  }
92 
93 }}}
94 
95 // STATISTICS: int-prop
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition: macros.hpp:120
int atleast(void) const
How many views are at least equal.
Definition: view-base.hpp:110
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3433
VZ z
View which yields result of counting.
Definition: count.hh:277
static bool sharing(const ViewArray< VX > &x, const VY &y, const VZ &z)
Test whether there is sharing of z with x or y.
Definition: view-base.hpp:127
Base-class for count propagators (view)
Definition: count.hh:270
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition: view-lq.hpp:67
#define forceinline
Definition: config.hpp:182
Propagation has computed fixpoint.
Definition: core.hpp:469
Computation spaces.
Definition: core.hpp:1668
Base-class for both propagators and branchers.
Definition: core.hpp:620
Propagator for counting views (less or equal integer to number of equal views)
Definition: count.hh:236
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:95
Gecode::FloatVal c(-8, 8)
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
VY y
View to compare to.
Definition: count.hh:275
ViewArray< VX > x
Views still to count.
Definition: count.hh:273
int c
Number of views which are equal and have been eliminated.
Definition: count.hh:279
void count(Space &home)
Count how many views are equal now.
Definition: view-base.hpp:89
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, VZ z, int c)
Post propagator for .
Definition: view-lq.hpp:48
Propagator for counting views (less or equal to number of equal views)
Definition: count.hh:348
Post propagator for SetVar SetOpType SetVar SetRelType SetVar z
Definition: set.hh:769
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:56
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: view-lq.hpp:73
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:769
LqView(Space &home, LqView &p)
Constructor for cloning p.
Definition: view-lq.hpp:62
ExecStatus
Definition: core.hpp:464
Post propagator for SetVar x
Definition: set.hh:769
Execution is okay.
Definition: core.hpp:468
Propagation has not computed fixpoint.
Definition: core.hpp:467
Gecode toplevel namespace
ExecStatus post_false(Home home, VX x, ConstIntView y)
Definition: rel.hpp:198
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1203
int ModEventDelta
Modification event deltas.
Definition: core.hpp:91
Home class for posting propagators
Definition: core.hpp:846