Generated on Tue Jan 26 2021 00:00:00 for Gecode by doxygen 1.9.1
val.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, 2007
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 Circuit {
35 
36  /*
37  * The actual propagator
38  *
39  */
40  template<class View, class Offset>
43  : Base<View,Offset>(home,x,o) {}
44 
45  template<class View, class Offset>
48  : Base<View,Offset>(home,p) {}
49 
50  template<class View, class Offset>
51  Actor*
53  return new (home) Val<View,Offset>(home,*this);
54  }
55 
56  template<class View, class Offset>
57  PropCost
58  Val<View,Offset>::cost(const Space&, const ModEventDelta&) const {
59  return PropCost::linear(PropCost::HI, x.size());
60  }
61 
62  template<class View, class Offset>
65  GECODE_ES_CHECK((Int::Distinct::prop_val<View,true>(home,y)));
66  ExecStatus esc = connected(home);
67  if (esc != ES_FIX)
68  return esc;
69  /*
70  * One cannot have a single unassigned view as the views constitute
71  * a permutation.
72  */
73  if (y.size() < 2)
74  return home.ES_SUBSUMED(*this);
75  return path(home);
76  }
77 
78  template<class View, class Offset>
81  int n = x.size();
82  if (n == 1) {
83  GECODE_ME_CHECK(o(x[0]).eq(home,0));
84  } else if (n == 2) {
85  GECODE_ME_CHECK(o(x[0]).eq(home,1));
86  GECODE_ME_CHECK(o(x[1]).eq(home,0));
87  } else {
88  for (int i=0; i<n; i++) {
89  GECODE_ME_CHECK(o(x[i]).gq(home,0));
90  GECODE_ME_CHECK(o(x[i]).le(home,n));
91  GECODE_ME_CHECK(o(x[i]).nq(home,i));
92  }
93  (void) new (home) Val<View,Offset>(home,x,o);
94  }
95  return ES_OK;
96  }
97 
98 }}}
99 
100 // STATISTICS: int-prop
101 
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
Base-class for both propagators and branchers.
Definition: core.hpp:628
Home class for posting propagators
Definition: core.hpp:856
Base-class for circuit propagator.
Definition: circuit.hh:55
"Value-consistent" circuit propagator
Definition: circuit.hh:88
static ExecStatus post(Home home, ViewArray< View > &x, Offset &o)
Post propagator for circuit on x.
Definition: val.hpp:80
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition: val.hpp:52
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: val.hpp:64
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (returns high linear)
Definition: val.hpp:58
Val(Space &home, Val &p)
Constructor for cloning p.
Converter with fixed offset.
Definition: view.hpp:650
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
@ HI
Expensive.
Definition: core.hpp:514
Computation spaces.
Definition: core.hpp:1742
View arrays.
Definition: array.hpp:253
ExecStatus
Definition: core.hpp:472
@ ES_OK
Execution is okay.
Definition: core.hpp:476
@ ES_FIX
Propagation has computed fixpoint.
Definition: core.hpp:477
void path(Home home, int offset, const IntVarArgs &x, IntVar s, IntVar e, IntPropLevel ipl)
Post propagator such that x forms a Hamiltonian path.
Definition: circuit.cpp:124
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3563
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:91
Gecode::IntArgs i({1, 2, 3, 4})
#define forceinline
Definition: config.hpp:185