Generated on Sat Apr 10 2021 00:00:00 for Gecode by doxygen 1.9.1
view-base.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  * This file is part of Gecode, the generic constraint
10  * development environment:
11  * http://www.gecode.org
12  *
13  * Permission is hereby granted, free of charge, to any person obtaining
14  * a copy of this software and associated documentation files (the
15  * "Software"), to deal in the Software without restriction, including
16  * without limitation the rights to use, copy, modify, merge, publish,
17  * distribute, sublicense, and/or sell copies of the Software, and to
18  * permit persons to whom the Software is furnished to do so, subject to
19  * the following conditions:
20  *
21  * The above copyright notice and this permission notice shall be
22  * included in all copies or substantial portions of the Software.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31  *
32  */
33 
34 namespace Gecode { namespace Int { namespace Count {
35 
36  template<class VX, class VY, class VZ>
39  ViewArray<VX>& x0, VY y0, VZ z0, int c0)
40  : Propagator(home), x(x0), y(y0), z(z0), c(c0) {
41  if (isintset(y))
42  home.notice(*this,AP_DISPOSE);
43  x.subscribe(home,*this,PC_INT_DOM);
44  subscribe(home,*this,y);
45  z.subscribe(home,*this,PC_INT_BND);
46  }
47 
48  template<class VX, class VY, class VZ>
51  : Propagator(home,p), c(p.c) {
52  x.update(home,p.x);
53  update(y,home,p.y);
54  z.update(home,p.z);
55  }
56 
57  template<class VX, class VY, class VZ>
58  PropCost
60  return PropCost::linear(PropCost::LO,x.size()+1);
61  }
62 
63  template<class VX, class VY, class VZ>
64  void
66  x.reschedule(home,*this,PC_INT_DOM);
68  z.reschedule(home,*this,PC_INT_BND);
69  }
70 
71  template<class VX, class VY, class VZ>
72  forceinline size_t
74  if (isintset(y))
75  home.ignore(*this,AP_DISPOSE);
76  x.cancel(home,*this,PC_INT_DOM);
77  cancel(home,*this,y);
78  z.cancel(home,*this,PC_INT_BND);
79  (void) Propagator::dispose(home);
80  return sizeof(*this);
81  }
82 
83  template<class VX, class VY, class VZ>
84  forceinline void
86  int n = x.size();
87  for (int i=n; i--; )
88  switch (holds(x[i],y)) {
89  case RT_FALSE:
90  x[i].cancel(home,*this,PC_INT_DOM); x[i]=x[--n];
91  break;
92  case RT_TRUE:
93  x[i].cancel(home,*this,PC_INT_DOM); x[i]=x[--n];
94  c--;
95  break;
96  case RT_MAYBE:
97  break;
98  default:
100  }
101  x.size(n);
102  }
103 
104  template<class VX, class VY, class VZ>
105  forceinline int
107  return -c;
108  }
109 
110  template<class VX, class VY, class VZ>
111  forceinline int
113  return x.size()-c;
114  }
115 
116  template<class VX>
117  forceinline bool
118  shared(const IntSet&, VX) {
119  return false;
120  }
121  template<class VX, class VY, class VZ>
122  forceinline bool
124  const VY& y, const VZ& z) {
125  if (shared(y,z))
126  return true;
127  for (int i=0; i<x.size(); i++)
128  if (shared(x[i],z))
129  return true;
130  return false;
131  }
132 
133 }}}
134 
135 // STATISTICS: int-prop
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:234
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:249
virtual size_t dispose(Space &home)
Delete actor and return its size.
Definition: core.hpp:3252
Home class for posting propagators
Definition: core.hpp:856
void notice(Actor &a, ActorProperty p, bool duplicate=false)
Notice actor property.
Definition: core.hpp:3219
Integer sets.
Definition: int.hh:174
Base-class for count propagators (view)
Definition: count.hh:266
int atleast(void) const
How many views are at least equal.
Definition: view-base.hpp:106
ViewArray< VX > x
Views still to count.
Definition: count.hh:269
void count(Space &home)
Count how many views are equal now.
Definition: view-base.hpp:85
virtual void reschedule(Space &home)
Schedule function.
Definition: view-base.hpp:65
VZ z
View which yields result of counting.
Definition: count.hh:273
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition: view-base.hpp:73
int atmost(void) const
How many views are at most equal.
Definition: view-base.hpp:112
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as low linear)
Definition: view-base.hpp:59
VY y
View to compare to.
Definition: count.hh:271
ViewBase(Space &home, ViewBase &p)
Constructor for cloning p.
Definition: view-base.hpp:50
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:123
Propagation cost.
Definition: core.hpp:486
static PropCost linear(PropCost::Mod m, unsigned int n)
Linear complexity for modifier pcm and size measure n.
Definition: core.hpp:4796
@ LO
Cheap.
Definition: core.hpp:513
Base-class for propagators.
Definition: core.hpp:1064
Computation spaces.
Definition: core.hpp:1742
void update(Space &home, ViewArray< View > &a)
Update array to be a clone of array a.
Definition: array.hpp:1328
void subscribe(Space &home, Propagator &p, PropCond pc, bool schedule=true)
Subscribe propagator p with propagation condition pc to variable.
Definition: array.hpp:1341
Post propagator for SetVar SetOpType SetVar SetRelType SetVar z
Definition: set.hh:767
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
void ignore(Actor &a, ActorProperty p, bool duplicate=false)
Ignore actor property.
Definition: core.hpp:4074
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
@ AP_DISPOSE
Actor must always be disposed.
Definition: core.hpp:562
void cancel(Space &home, Propagator &p, IntSet &y)
Definition: rel.hpp:81
RelTest holds(VX x, ConstIntView y)
Test whether x and y are equal.
Definition: rel.hpp:115
void subscribe(Space &home, Propagator &p, IntSet &y)
Definition: rel.hpp:71
bool isintset(VY y)
Return whether y is an integer set.
Definition: rel.hpp:45
void update(IntSet &y, Space &home, IntSet &py)
Definition: rel.hpp:103
void reschedule(Space &home, Propagator &p, IntSet &y)
Definition: rel.hpp:92
bool shared(const IntSet &, VX)
Definition: view-base.hpp:118
const Gecode::PropCond PC_INT_BND
Propagate when minimum or maximum of a view changes.
Definition: var-type.hpp:91
const Gecode::PropCond PC_INT_DOM
Propagate when domain changes.
Definition: var-type.hpp:100
@ RT_TRUE
Relation does hold.
Definition: view.hpp:1737
@ RT_MAYBE
Relation may hold or not.
Definition: view.hpp:1736
@ RT_FALSE
Relation does not hold.
Definition: view.hpp:1735
Gecode::FloatVal c(-8, 8)
Gecode::IntArgs i({1, 2, 3, 4})
#define forceinline
Definition: config.hpp:192
#define GECODE_NEVER
Assert that this command is never executed.
Definition: macros.hpp:56