int-eq.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2011
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
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* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
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#include <gecode/int/rel.hh>
#include <gecode/int/distinct.hh>
namespace Gecode { namespace Int { namespace NValues {
template<class VY>
forceinline
EqInt<VY>::EqInt(Home home, ValSet& vs, ViewArray<IntView>& x, VY y)
: IntBase<VY>(home,vs,x,y) {
home.notice(*this, AP_WEAKLY);
}
template<class VY>
inline ExecStatus
EqInt<VY>::post(Home home, ViewArray<IntView>& x, VY y) {
if (x.size() == 0) {
GECODE_ME_CHECK(y.eq(home,0));
return ES_OK;
}
x.unique();
if (x.size() == 1) {
GECODE_ME_CHECK(y.eq(home,1));
return ES_OK;
}
GECODE_ME_CHECK(y.gq(home,1));
GECODE_ME_CHECK(y.lq(home,x.size()));
if (y.max() == 1) {
assert(y.assigned());
return Rel::NaryEqDom<IntView>::post(home,x);
}
if (y.min() == x.size()) {
assert(y.assigned());
return Distinct::Dom<IntView>::post(home,x);
}
// Eliminate assigned views and store them into the value set
ValSet vs;
int n = x.size();
for (int i=n; i--; )
if (x[i].assigned()) {
vs.add(home, x[i].val());
x[i] = x[--n];
}
GECODE_ME_CHECK(y.gq(home,vs.size()));
GECODE_ME_CHECK(y.lq(home,n + vs.size()));
if (n == 0) {
assert(y.val() == vs.size());
return ES_OK;
}
x.size(n);
(void) new (home) EqInt<VY>(home, vs, x, y);
return ES_OK;
}
template<class VY>
forceinline
EqInt<VY>::EqInt(Space& home, EqInt<VY>& p)
: IntBase<VY>(home, p) {}
template<class VY>
Propagator*
EqInt<VY>::copy(Space& home) {
return new (home) EqInt<VY>(home, *this);
}
template<class VY>
forceinline size_t
EqInt<VY>::dispose(Space& home) {
home.ignore(*this, AP_WEAKLY);
(void) IntBase<VY>::dispose(home);
return sizeof(*this);
}
template<class VY>
ExecStatus
EqInt<VY>::propagate(Space& home, const ModEventDelta& med) {
// Add assigned views to value set
if (IntView::me(med) == ME_INT_VAL)
add(home);
GECODE_ME_CHECK(y.gq(home, vs.size()));
GECODE_ME_CHECK(y.lq(home, x.size() + vs.size()));
if (x.size() == 0)
return home.ES_SUBSUMED(*this);
// All values must be in the value set
if (y.max() == vs.size())
return all_in_valset(home);
// Compute positions of disjoint views and eliminate subsumed views
Region r;
int* dis; int n_dis;
disjoint(home,r,dis,n_dis);
// The number might have changed due to elimination of subsumed views
GECODE_ME_CHECK(y.lq(home, x.size() + vs.size()));
if (x.size() == 0) {
assert(y.val() == vs.size());
return home.ES_SUBSUMED(*this);
}
GECODE_ES_CHECK(prune_upper(home,g));
// No lower bound pruning possible
if (n_dis == 0)
return ES_NOFIX;
// Only if the propagator is at fixpoint here, continue with
// propagating the lower bound
if (IntView::me(Propagator::modeventdelta()) != ME_INT_NONE)
return ES_NOFIX;
// Do lower bound-based pruning
GECODE_ES_CHECK(prune_lower(home,dis,n_dis));
return ES_NOFIX;
}
}}}
// STATISTICS: int-prop
Gecode::Home
Home class for posting propagators
Definition core.hpp:856
Gecode::Home::notice
void notice(Actor &a, ActorProperty p, bool duplicate=false)
Notice actor property.
Definition core.hpp:3219
Gecode::Int::Distinct::Dom::post
static ExecStatus post(Home home, ViewArray< View > &x)
Post propagator for views x.
Definition dom.hpp:45
Gecode::Int::NValues::EqInt::EqInt
EqInt(Home home, ValSet &vs, ViewArray< IntView > &x, VY y)
Constructor for posting.
Definition int-eq.hpp:41
Gecode::Int::NValues::EqInt::copy
virtual Propagator * copy(Space &home)
Copy propagator during cloning.
Definition int-eq.hpp:102
Gecode::Int::NValues::EqInt::dispose
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition int-eq.hpp:108
Gecode::Int::NValues::EqInt::post
static ExecStatus post(Home home, ViewArray< IntView > &x, VY y)
Post propagator for .
Definition int-eq.hpp:48
Gecode::Int::NValues::EqInt::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition int-eq.hpp:116
Gecode::Int::NValues::EqInt::g
Graph g
View-value graph.
Definition nvalues.hh:196
Gecode::Int::NValues::IntBase::dispose
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition int-base.hpp:53
Gecode::Int::NValues::IntBase::vs
ValSet vs
Value set storing the values of already assigned views.
Definition nvalues.hh:138
Gecode::Int::NValues::IntBase::prune_lower
ExecStatus prune_lower(Space &home, int *dis, int n_dis)
Definition int-base.hpp:130
Gecode::Int::NValues::IntBase::disjoint
void disjoint(Space &home, Region &r, int *&dis, int &n_dis)
Definition int-base.hpp:80
Gecode::Int::NValues::IntBase::add
void add(Space &home)
Add values of assigned views to value set.
Definition int-base.hpp:68
Gecode::Int::NValues::IntBase::all_in_valset
ExecStatus all_in_valset(Space &home)
Propagate that all views must take values from value set.
Definition int-base.hpp:120
Gecode::Int::NValues::IntBase::prune_upper
ExecStatus prune_upper(Space &home, Graph &g)
Definition int-base.hpp:298
Gecode::Int::NValues::IntBase::IntBase
IntBase(Home home, ValSet &vs, ViewArray< IntView > &x, VY y)
Constructor for posting.
Definition int-base.hpp:40
Gecode::Int::Rel::NaryEqDom::post
static ExecStatus post(Home home, ViewArray< View > &x)
Post domain consistent propagator .
Definition eq.hpp:270
Gecode::Int::ValSet
Class for storing values of already assigned views.
Definition val-set.hh:44
Gecode::MixNaryOnePropagator< IntView, PC_INT_DOM, VY, PC_INT_BND >::x
ViewArray< IntView > x
Definition pattern.hpp:275
Gecode::MixNaryOnePropagator< IntView, PC_INT_DOM, VY, PC_INT_BND >::y
VY y
Definition pattern.hpp:277
Gecode::Propagator
Base-class for propagators.
Definition core.hpp:1064
Gecode::Propagator::Space
friend class Space
Definition core.hpp:1066
Gecode::Propagator::modeventdelta
ModEventDelta modeventdelta(void) const
Return the modification event delta.
Definition core.hpp:3520
Gecode::Propagator::med
ModEventDelta med
A set of modification events (used during propagation).
Definition core.hpp:1075
Gecode::Region
Handle to region.
Definition region.hpp:55
Gecode::VarImpView< IntVar >::me
static ModEvent me(const ModEventDelta &med)
Definition view.hpp:552
Gecode::ViewArray
View arrays.
Definition array.hpp:253
Gecode::Space::ES_SUBSUMED
ExecStatus ES_SUBSUMED(Propagator &p)
Definition core.hpp:3563
Gecode::Space::ignore
void ignore(Actor &a, ActorProperty p, bool duplicate=false)
Ignore actor property.
Definition core.hpp:4074
Gecode::ModEventDelta
int ModEventDelta
Modification event deltas.
Definition core.hpp:89
GECODE_ME_CHECK
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition macros.hpp:52
GECODE_ES_CHECK
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition macros.hpp:91
Gecode::AP_WEAKLY
@ AP_WEAKLY
Definition core.hpp:568
distinct.hh
rel.hh
Gecode::Int::NValues
Number of values propagators.
Gecode::Int
Finite domain integers.
Gecode::Int::ME_INT_VAL
const Gecode::ModEvent ME_INT_VAL
Domain operation has resulted in a value (assigned variable).
Definition var-type.hpp:56
Gecode::Int::ME_INT_NONE
const Gecode::ModEvent ME_INT_NONE
Domain operation has not changed domain.
Definition var-type.hpp:54
Gecode
Gecode toplevel namespace
Gecode::ExecStatus
ExecStatus
Definition core.hpp:472
Gecode::ES_OK
@ ES_OK
Execution is okay.
Definition core.hpp:476
Gecode::ES_NOFIX
@ ES_NOFIX
Propagation has not computed fixpoint.
Definition core.hpp:475
forceinline
#define forceinline
Definition config.hpp:187