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view-gq.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
8 *
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33
34namespace Gecode { namespace Int { namespace Count {
35
36 template<class VX, class VY, class VZ, bool shr, bool dom>
39 : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
40
41 template<class VX, class VY, class VZ, bool shr, bool dom>
44 ViewArray<VX>& x, VY y, VZ z, int c) {
45 GECODE_ME_CHECK(z.lq(home,x.size()-c));
46 if (isval(y) && z.assigned())
47 return GqInt<VX,VY>::post(home,x,y,z.val()+c);
48 if (sharing(x,y,z))
49 (void) new (home) GqView<VX,VY,VZ,true,dom>(home,x,y,z,c);
50 else
51 (void) new (home) GqView<VX,VY,VZ,false,dom>(home,x,y,z,c);
52 return ES_OK;
53 }
54
55 template<class VX, class VY, class VZ, bool shr, bool dom>
59
60 template<class VX, class VY, class VZ, bool shr, bool dom>
61 Actor*
63 return new (home) GqView<VX,VY,VZ,shr,dom>(home,*this);
64 }
65
66 template<class VX, class VY, class VZ, bool shr, bool dom>
69 count(home);
70
71 GECODE_ME_CHECK(z.lq(home,atmost()));
72
73 if (z.min() == atmost()) {
75 return home.ES_SUBSUMED(*this);
76 }
77 if (x.size() == 0)
78 return home.ES_SUBSUMED(*this);
79
80 if (z.assigned() && (!dom ||isval(y))) {
81 VY yc(y);
82 GECODE_REWRITE(*this,(GqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
83 }
84
85 if (dom && !isval(y) && (z.min() > 0)) {
86 /*
87 * Only if the propagator is at fixpoint here, continue
88 * when things are shared: the reason is that prune
89 * requires that the views in x overlap with y!
90 */
91 if (shr && (VX::me(Propagator::modeventdelta()) != ME_INT_NONE))
92 return ES_NOFIX;
93
94 GECODE_ES_CHECK(prune(home,x,y));
95
96 return ES_NOFIX;
97 }
98
99 return shr ? ES_NOFIX : ES_FIX;
100 }
101
102}}}
103
104// 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-gq.hpp:43
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition view-gq.hpp:68
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, VZ z, int c)
Post propagator for .
Definition view-gq.hpp:43
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition view-gq.hpp:62
GqView(Space &home, GqView &p)
Constructor for cloning p.
Definition view-gq.hpp:57
ViewArray< VX > x
Views still to count.
Definition count.hh:269
VZ z
View which yields result of counting.
Definition count.hh:273
int atmost(void) const
How many views are at most equal.
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
ModEventDelta modeventdelta(void) const
Return the modification event delta.
Definition core.hpp:3527
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 prune(Home home, ViewArray< VX > &x, VX y)
Prune that y is the union of x.
bool isval(VY y)
Return whether y is a value.
Definition rel.hpp:59
ExecStatus post_true(Home home, ViewArray< VX > &x, VX y)
Post that all views in x are equal to y.
Definition rel.hpp:237
Finite domain integers.
const Gecode::ModEvent ME_INT_NONE
Domain operation has not changed domain.
Definition var-type.hpp:54
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
void dom(Home home, FloatVar x, FloatVal n)
Propagates .
Definition dom.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