propagate.cpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2019
*
* 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
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* permit persons to whom the Software is furnished to do so, subject to
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*
* The above copyright notice and this permission notice shall be
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*
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#include <gecode/int/order.hh>
namespace Gecode { namespace Int { namespace Order {
Actor*
OrderProp::copy(Space& home) {
return new (home) OrderProp(home,*this);
}
PropCost
OrderProp::cost(const Space&, const ModEventDelta&) const {
return PropCost::binary(PropCost::LO);
}
void
OrderProp::reschedule(Space& home) {
s0.reschedule(home,*this,PC_INT_BND);
s1.reschedule(home,*this,PC_INT_BND);
b.reschedule(home,*this,PC_INT_VAL);
}
ExecStatus
OrderProp::propagate(Space& home, const ModEventDelta&) {
if (s0.max() + p0 <= s1.min()) {
GECODE_ME_CHECK(b.zero(home));
return home.ES_SUBSUMED(*this);
} else if (s1.max() + p1 <= s0.min()) {
GECODE_ME_CHECK(b.one(home));
return home.ES_SUBSUMED(*this);
} else if ((s1.min() + p1 > s0.max()) || b.zero()) {
GECODE_ME_CHECK(b.zero(home));
GECODE_REWRITE(*this,(Rel::Lq<OffsetView,IntView>::post
(home(*this),OffsetView(s0,p0),s1)));
} else if ((s0.min() + p0 > s1.max()) || b.one()) {
GECODE_ME_CHECK(b.one(home));
GECODE_REWRITE(*this,(Rel::Lq<OffsetView,IntView>::post
(home(*this),OffsetView(s1,p1),s0)));
}
return ES_FIX;
}
size_t
OrderProp::dispose(Space& home) {
s0.cancel(home,*this,PC_INT_BND);
s1.cancel(home,*this,PC_INT_BND);
b.cancel(home,*this,PC_INT_VAL);
(void) Propagator::dispose(home);
return sizeof(*this);
}
}}}
// STATISTICS: int-prop
Gecode::Actor::dispose
virtual size_t dispose(Space &home)
Delete actor and return its size.
Definition core.hpp:3252
Gecode::Int::OffsetView
Offset integer view.
Definition view.hpp:443
Gecode::Int::Order::OrderProp::b
BoolView b
Boolean view for order.
Definition order.hh:58
Gecode::Int::Order::OrderProp::dispose
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition propagate.cpp:76
Gecode::Int::Order::OrderProp::cost
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as low binary).
Definition propagate.cpp:44
Gecode::Int::Order::OrderProp::copy
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition propagate.cpp:39
Gecode::Int::Order::OrderProp::s1
IntView s1
Definition order.hh:56
Gecode::Int::Order::OrderProp::p0
int p0
Processing times.
Definition order.hh:60
Gecode::Int::Order::OrderProp::OrderProp
OrderProp(Space &home, OrderProp &p)
Constructor for cloning.
Definition propagate.hpp:67
Gecode::Int::Order::OrderProp::s0
IntView s0
View for start times.
Definition order.hh:56
Gecode::Int::Order::OrderProp::reschedule
virtual void reschedule(Space &home)
Schedule function.
Definition propagate.cpp:49
Gecode::Int::Order::OrderProp::p1
int p1
Definition order.hh:60
Gecode::Int::Order::OrderProp::propagate
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition propagate.cpp:56
Gecode::Int::Rel::Lq::post
static ExecStatus post(Home home, V0 x0, V1 x1)
Post propagator .
Definition lq-le.hpp:50
Gecode::PropCost
Propagation cost.
Definition core.hpp:486
Gecode::PropCost::binary
static PropCost binary(PropCost::Mod m)
Two variables for modifier pcm.
Definition core.hpp:4809
Gecode::PropCost::LO
@ LO
Cheap.
Definition core.hpp:513
Gecode::Propagator::Space
friend class Space
Definition core.hpp:1066
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_REWRITE
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition macros.hpp:116
Gecode::Int::Order
Int for ordering two tasks
Gecode::Int
Finite domain integers.
Gecode::Int::PC_INT_VAL
const Gecode::PropCond PC_INT_VAL
Propagate when a view becomes assigned (single value).
Definition var-type.hpp:82
Gecode::Int::PC_INT_BND
const Gecode::PropCond PC_INT_BND
Propagate when minimum or maximum of a view changes.
Definition var-type.hpp:91
Gecode
Gecode toplevel namespace
Gecode::ExecStatus
ExecStatus
Definition core.hpp:472
Gecode::ES_FIX
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
order.hh