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ngl.cpp
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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, 2013
8 *
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33
34#include <gecode/set/branch.hh>
35
36namespace Gecode { namespace Set { namespace Branch {
37
38 NGL*
39 IncNGL::copy(Space& home) {
40 return new (home) IncNGL(home,*this);
41 }
43 IncNGL::status(const Space&) const {
44 // Is n in the glb(x)?
45 if (x.contains(n))
46 return NGL::SUBSUMED;
47 else
48 // Is n not in the lub(x)?
50 }
52 IncNGL::prune(Space& home) {
53 return me_failed(x.exclude(home,n)) ? ES_FAILED : ES_OK;
54 }
55
56
57 NGL*
58 ExcNGL::copy(Space& home) {
59 return new (home) ExcNGL(home,*this);
60 }
62 ExcNGL::status(const Space&) const {
63 // Is n not in the lub(x)?
64 if (x.notContains(n))
65 return NGL::SUBSUMED;
66 else
67 // Is n in the lub(x)?
68 return x.contains(n) ? NGL::FAILED : NGL::NONE;
69 }
71 ExcNGL::prune(Space& home) {
72 return me_failed(x.include(home,n)) ? ES_FAILED : ES_OK;
73 }
74
75}}}
76
77// STATISTICS: set-branch
No-good literal recorded during search.
Definition core.hpp:1340
Status
The status of a no-good literal.
Definition core.hpp:1346
@ SUBSUMED
The literal is subsumed.
Definition core.hpp:1348
@ FAILED
The literal is failed.
Definition core.hpp:1347
@ NONE
The literal is neither failed nor subsumed.
Definition core.hpp:1349
ExcNGL(Space &home, SetView x, int n)
Constructor for creation.
Definition ngl.hpp:44
IncNGL(Space &home, SetView x, int n)
Constructor for creation.
Definition ngl.hpp:37
bool contains(int i) const
Test whether i is in the greatest lower bound.
Definition set.hpp:74
ModEvent include(Space &home, int i, int j)
Update greatest lower bound to include all elements between and including i and j.
Definition set.hpp:126
bool notContains(int i) const
Test whether i is not in the least upper bound.
Definition set.hpp:78
ModEvent exclude(Space &home, int i, int j)
Restrict least upper bound to not contain all elements between and including i and j.
Definition set.hpp:156
Computation spaces.
Definition core.hpp:1742
bool me_failed(ModEvent me)
Check whether modification event me is failed.
Definition modevent.hpp:54
Gecode toplevel namespace
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
@ ES_FAILED
Execution has resulted in failure.
Definition core.hpp:474