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val.hpp
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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
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33
34namespace Gecode { namespace Int { namespace Circuit {
35
36 /*
37 * The actual propagator
38 *
39 */
40 template<class View, class Offset>
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>
59 return PropCost::linear(PropCost::HI, x.size());
60 }
61
62 template<class View, class Offset>
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
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
ExecStatus connected(Space &home)
Check whether the view value graph is strongly connected.
Definition base.hpp:69
ViewArray< View > y
Array for performing value propagation for distinct.
Definition circuit.hh:61
Offset o
Offset transformation.
Definition circuit.hh:63
Base(Space &home, Base &p)
Constructor for cloning p.
"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:4803
@ HI
Expensive.
Definition core.hpp:514
friend class Space
Definition core.hpp:1068
Computation spaces.
Definition core.hpp:1744
View arrays.
Definition array.hpp:253
ExecStatus ES_SUBSUMED(Propagator &p)
Propagator p is subsumed
Definition core.hpp:3570
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
Circuit propagators
ExecStatus prop_val(Space &home, ViewArray< View > &)
Eliminate singletons by naive value propagation.
Definition val.hpp:42
Finite domain integers.
Gecode toplevel namespace
void path(Home home, const IntVarArgs &x, IntVar s, IntVar e, IntPropLevel ipl=IPL_DEF)
Post propagator such that x forms a Hamiltonian path.
Definition circuit.cpp:169
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
#define forceinline
Definition config.hpp:194