set.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Denys Duchier <denys.duchier@univ-orleans.fr>
*
* Copyright:
* Denys Duchier, 2011
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
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* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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namespace Gecode { namespace Set { namespace Channel {
template <typename View>
forceinline
ChannelSet<View>::ChannelSet(Home home,
ViewArray<CachedView<View> >& xs0,
ViewArray<CachedView<View> >& ys0)
: Propagator(home), xs(xs0), ys(ys0) {
for (int i=xs.size(); i--;)
xs[i].initCache(home,IntSet::empty,IntSet(0,ys.size()-1));
for (int i=ys.size(); i--;)
ys[i].initCache(home,IntSet::empty,IntSet(0,xs.size()-1));
xs.subscribe(home,*this, PC_SET_ANY);
ys.subscribe(home,*this, PC_SET_ANY);
}
template <typename View>
forceinline
ChannelSet<View>::ChannelSet(Space& home, ChannelSet& p)
: Propagator(home, p) {
xs.update(home, p.xs);
ys.update(home, p.ys);
}
template <typename View>
forceinline ExecStatus
ChannelSet<View>::post(Home home,
ViewArray<CachedView<View> >& xs,
ViewArray<CachedView<View> >& ys) {
int xssize = xs.size();
for (int i=ys.size(); i--;) {
GECODE_ME_CHECK(ys[i].exclude(home, xssize, Limits::max));
GECODE_ME_CHECK(ys[i].exclude(home, Limits::min, -1));
}
int yssize = ys.size();
for (int i=xs.size(); i--;) {
GECODE_ME_CHECK(xs[i].exclude(home, yssize, Limits::max));
GECODE_ME_CHECK(xs[i].exclude(home, Limits::min, -1));
}
(void) new (home) ChannelSet(home,xs,ys);
return ES_OK;
}
template <typename View>
PropCost
ChannelSet<View>::cost(const Space&, const ModEventDelta&) const {
return PropCost::quadratic(PropCost::HI, xs.size()+ys.size());
}
template <typename View>
void
ChannelSet<View>::reschedule(Space& home) {
xs.reschedule(home,*this, PC_SET_ANY);
ys.reschedule(home,*this, PC_SET_ANY);
}
template <typename View>
forceinline size_t
ChannelSet<View>::dispose(Space& home) {
xs.cancel(home, *this, PC_SET_ANY);
ys.cancel(home, *this, PC_SET_ANY);
(void) Propagator::dispose(home);
return sizeof(*this);
}
template <typename View>
Actor*
ChannelSet<View>::copy(Space& home) {
return new (home) ChannelSet(home,*this);
}
template <typename View>
ExecStatus
ChannelSet<View>::propagate(Space& home, const ModEventDelta&) {
int assigned = 0;
bool again = true;
while (again) {
assigned = 0;
again = false;
for (int i=xs.size(); i--;) {
if (xs[i].assigned())
++assigned;
if (xs[i].glbModified()) {
GlbDiffRanges<View> xilb(xs[i]);
Iter::Ranges::ToValues<GlbDiffRanges<View> > dv(xilb);
for (;dv();++dv)
GECODE_ME_CHECK(ys[dv.val()].include(home,i));
xs[i].cacheGlb(home);
again = true;
}
if (xs[i].lubModified()) {
LubDiffRanges<View> xiub(xs[i]);
Iter::Ranges::ToValues<LubDiffRanges<View> > dv(xiub);
for (;dv();++dv)
GECODE_ME_CHECK(ys[dv.val()].exclude(home,i));
xs[i].cacheLub(home);
again = true;
}
}
for (int i=ys.size(); i--;) {
if (ys[i].assigned())
++assigned;
if (ys[i].glbModified()) {
GlbDiffRanges<View> yilb(ys[i]);
Iter::Ranges::ToValues<GlbDiffRanges<View> > dv(yilb);
for (;dv();++dv)
GECODE_ME_CHECK(xs[dv.val()].include(home,i));
ys[i].cacheGlb(home);
again = true;
}
if (ys[i].lubModified()) {
LubDiffRanges<View> yiub(ys[i]);
Iter::Ranges::ToValues<LubDiffRanges<View> > dv(yiub);
for (;dv();++dv)
GECODE_ME_CHECK(xs[dv.val()].exclude(home,i));
ys[i].cacheLub(home);
again = true;
}
}
}
return (assigned == xs.size()+ys.size()) ? home.ES_SUBSUMED(*this) : ES_FIX;
}
}}}
// STATISTICS: set-prop
Gecode::Actor
Base-class for both propagators and branchers.
Definition core.hpp:628
Gecode::Actor::dispose
virtual size_t dispose(Space &home)
Delete actor and return its size.
Definition core.hpp:3252
Gecode::Home
Home class for posting propagators
Definition core.hpp:856
Gecode::IntSet
Integer sets.
Definition int.hh:174
Gecode::IntSet::empty
static const IntSet empty
Empty set.
Definition int.hh:283
Gecode::Int::CachedView
Cached integer view.
Definition view.hpp:1166
Gecode::Iter::Ranges::ToValues
Value iterator from range iterator.
Definition ranges-values.hpp:42
Gecode::Iter::Ranges::ToValues::val
int val(void) const
Return current value.
Definition ranges-values.hpp:129
Gecode::PropCost
Propagation cost.
Definition core.hpp:486
Gecode::PropCost::quadratic
static PropCost quadratic(PropCost::Mod m, unsigned int n)
Quadratic complexity for modifier m and size measure n.
Definition core.hpp:4787
Gecode::PropCost::HI
@ HI
Expensive.
Definition core.hpp:514
Gecode::Propagator::Space
friend class Space
Definition core.hpp:1066
Gecode::Propagator::Propagator
Propagator(Home home)
Constructor for posting.
Definition core.hpp:3498
Gecode::Set::Channel::ChannelSet::dispose
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition set.hpp:92
Gecode::Set::Channel::ChannelSet::reschedule
virtual void reschedule(Space &home)
Schedule function.
Definition set.hpp:85
Gecode::Set::Channel::ChannelSet::post
static ExecStatus post(Home home, ViewArray< CachedView< View > > &x, ViewArray< CachedView< View > > &y)
Post propagator for .
Definition set.hpp:60
Gecode::Set::Channel::ChannelSet::cost
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as PC_QUADRATIC_HI).
Definition set.hpp:79
Gecode::Set::Channel::ChannelSet::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition set.hpp:101
Gecode::Set::Channel::ChannelSet::ChannelSet
ChannelSet(Space &home, ChannelSet &p)
Constructor for cloning p.
Definition set.hpp:52
Gecode::Set::Channel::ChannelSet::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition set.hpp:107
Gecode::Set::Channel::ChannelSet::xs
ViewArray< CachedView< View > > xs
SetViews, reflects the successors of .
Definition channel.hh:229
Gecode::Set::Channel::ChannelSet::ys
ViewArray< CachedView< View > > ys
SetViews, reflects the predecessors of .
Definition channel.hh:231
Gecode::Set::GlbDiffRanges
Range iterator for difference of greatest lower bound and cache
Definition view.hpp:1138
Gecode::Set::LubDiffRanges
Range iterator for difference of least upper bound and cache
Definition view.hpp:1155
Gecode::ViewArray
View arrays.
Definition array.hpp:253
Gecode::Space::ES_SUBSUMED
ExecStatus ES_SUBSUMED(Propagator &p)
Definition core.hpp:3563
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::Set::Channel
Channeling propagators for set variables.
Definition channel.hh:43
Gecode::Set::Limits::min
const int min
Smallest allowed integer in integer set.
Definition set.hh:99
Gecode::Set::Limits::max
const int max
Largest allowed integer in integer set.
Definition set.hh:97
Gecode::Set
Finite integer sets.
Definition var-imp.hpp:137
Gecode::Set::PC_SET_ANY
const Gecode::PropCond PC_SET_ANY
Propagate when any bound or the cardinality of a view changes.
Definition var-type.hpp:248
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_FIX
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
forceinline
#define forceinline
Definition config.hpp:187