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view-lq.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, 2003
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33
34namespace Gecode { namespace Int { namespace Count {
35
36 template<class VX, class VY, class VZ, bool shr>
39 VY y, VZ z, int c)
40 : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
41
42 template<class VX, class VY, class VZ, bool shr>
45 VY y, VZ z, int c) {
46 GECODE_ME_CHECK(z.gq(home,-c));
47 if (z.assigned())
48 return LqInt<VX,VY>::post(home,x,y,z.val()+c);
49 if (sharing(x,y,z))
50 (void) new (home) LqView<VX,VY,VZ,true>(home,x,y,z,c);
51 else
52 (void) new (home) LqView<VX,VY,VZ,false>(home,x,y,z,c);
53 return ES_OK;
54 }
55
56 template<class VX, class VY, class VZ, bool shr>
60
61 template<class VX, class VY, class VZ, bool shr>
62 Actor*
64 return new (home) LqView<VX,VY,VZ,shr>(home,*this);
65 }
66
67 template<class VX, class VY, class VZ, bool shr>
70 count(home);
71 GECODE_ME_CHECK(z.gq(home,atleast()));
72
73 if (z.max() == atleast()) {
75 return home.ES_SUBSUMED(*this);
76 }
77
78 if (x.size() == 0)
79 return home.ES_SUBSUMED(*this);
80
81 if (z.assigned()) {
82 VY yc(y);
83 GECODE_REWRITE(*this,(LqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
84 }
85
86 return shr ? ES_NOFIX : ES_FIX;
87 }
88
89}}}
90
91// STATISTICS: int-prop
Base-class for both propagators and branchers.
Definition core.hpp:628
Home class for posting propagators
Definition core.hpp:856
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, int c)
Post propagator for .
Definition int-lq.hpp:43
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, VZ z, int c)
Post propagator for .
Definition view-lq.hpp:44
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition view-lq.hpp:63
LqView(Space &home, LqView &p)
Constructor for cloning p.
Definition view-lq.hpp:58
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition view-lq.hpp:69
int atleast(void) const
How many views are at least equal.
ViewArray< VX > x
Views still to count.
Definition count.hh:269
VZ z
View which yields result of counting.
Definition count.hh:273
int c
Number of views which are equal and have been eliminated.
Definition count.hh:275
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.
friend class Space
Definition core.hpp:1068
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_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition macros.hpp:116
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition macros.hpp:91
Counting propagators.
ExecStatus post_false(Home home, ViewArray< VX > &x, VX y)
Post that all views in x are not equal to y.
Definition rel.hpp:251
Finite domain integers.
Gecode toplevel namespace
void count(Home home, const IntVarArgs &x, int n, IntRelType irt, int m, IntPropLevel ipl=IPL_DEF)
Post propagator for .
Definition count.cpp:40
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
@ ES_NOFIX
Propagation has not computed fixpoint.
Definition core.hpp:475
#define forceinline
Definition config.hpp:194