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view-eq.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 ViewArray<VX>& x, 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, bool dom>
45 ViewArray<VX>& x, VY y, VZ z, int c) {
46 GECODE_ME_CHECK(z.gq(home,-c));
47 GECODE_ME_CHECK(z.lq(home,x.size()-c));
48 if (isval(y) && z.assigned())
49 return EqInt<VX,VY>::post(home,x,y,z.val()+c);
50 if (sharing(x,y,z))
51 (void) new (home) EqView<VX,VY,VZ,true,dom>(home,x,y,z,c);
52 else
53 (void) new (home) EqView<VX,VY,VZ,false,dom>(home,x,y,z,c);
54 return ES_OK;
55 }
56
57 template<class VX, class VY, class VZ, bool shr, bool dom>
61
62 template<class VX, class VY, class VZ, bool shr, bool dom>
63 Actor*
65 return new (home) EqView<VX,VY,VZ,shr,dom>(home,*this);
66 }
67
68 template<class VX, class VY, class VZ, bool shr, bool dom>
71 count(home);
72
73 GECODE_ME_CHECK(z.gq(home,atleast()));
74 GECODE_ME_CHECK(z.lq(home,atmost()));
75
76 if (z.assigned()) {
77 if (z.val() == atleast()) {
79 return home.ES_SUBSUMED(*this);
80 }
81 if (z.val() == atmost()) {
83 return home.ES_SUBSUMED(*this);
84 }
85 if (!dom || isval(y)) {
86 VY yc(y);
88 ::post(home(*this),x,yc,z.val()+c)));
89 }
90 }
91
92
93 if (dom && !isval(y) && (z.min() > 0)) {
94 /*
95 * Only if the propagator is at fixpoint here, continue
96 * when things are shared: the reason is that prune
97 * requires that the views in x overlap with y!
98 */
99 if (shr && (VX::me(Propagator::modeventdelta()) != ME_INT_NONE))
100 return ES_NOFIX;
101
102 GECODE_ES_CHECK(prune(home,x,y));
103
104 return ES_NOFIX;
105 }
106
107 return shr ? ES_NOFIX : ES_FIX;
108 }
109
110}}}
111
112// STATISTICS: int-prop
int p
Number of positive literals for node type.
Base-class for both propagators and branchers.
Definition core.hpp:628
Home class for posting propagators
Definition core.hpp:856
Propagator for counting views (equal integer to number of equal views)
Definition count.hh:172
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, int c)
Post propagator for .
Definition int-eq.hpp:43
Propagator for counting views (equal to number of equal views)
Definition count.hh:309
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, VZ z, int c)
Post propagator for .
Definition view-eq.hpp:44
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition view-eq.hpp:70
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition view-eq.hpp:64
EqView(Space &home, EqView &p)
Constructor for cloning p.
Definition view-eq.hpp:59
Base-class for count propagators (view)
Definition count.hh:266
ModEventDelta modeventdelta(void) const
Return the modification event delta.
Definition core.hpp:3520
Computation spaces.
Definition core.hpp:1742
bool assigned(void) const
Test whether view is assigned.
Definition var.hpp:111
View arrays.
Definition array.hpp:253
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_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
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_false(Home home, ViewArray< VX > &x, VX y)
Post that all views in x are not equal to y.
Definition rel.hpp:251
ExecStatus post_true(Home home, ViewArray< VX > &x, VX y)
Post that all views in x are equal to y.
Definition rel.hpp:237
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 atmost(Home home, const IntVarArgs &x, int n, int m, IntPropLevel ipl=IPL_DEF)
Post constraint .
Definition aliases.hpp:39
void atleast(Home home, const IntVarArgs &x, int n, int m, IntPropLevel ipl=IPL_DEF)
Post constraint .
Definition aliases.hpp:70
void dom(Home home, FloatVar x, FloatVal n)
Propagates .
Definition dom.cpp:40
Post propagator for SetVar SetOpType SetVar SetRelType SetVar z
Definition set.hh:767
Post propagator for SetVar SetOpType SetVar y
Definition set.hh:767
TFE post(PropagatorGroup g)
Only post functions (but not propagators) from g are considered.
Definition filter.cpp:138
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
Post propagator for SetVar x
Definition set.hh:767
#define forceinline
Definition config.hpp:187