Generated on Tue Feb 11 2025 17:33:26 for Gecode by doxygen 1.12.0
propagate.cpp
Go to the documentation of this file.
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, 2019
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining
14 * a copy of this software and associated documentation files (the
15 * "Software"), to deal in the Software without restriction, including
16 * without limitation the rights to use, copy, modify, merge, publish,
17 * distribute, sublicense, and/or sell copies of the Software, and to
18 * permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be
22 * included in all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 *
32 */
33
34#include <gecode/int/order.hh>
35
36namespace Gecode { namespace Int { namespace Order {
37
38 Actor*
40 return new (home) OrderProp(home,*this);
41 }
42
44 OrderProp::cost(const Space&, const ModEventDelta&) const {
46 }
47
48 void
50 s0.reschedule(home,*this,PC_INT_BND);
51 s1.reschedule(home,*this,PC_INT_BND);
52 b.reschedule(home,*this,PC_INT_VAL);
53 }
54
57 if (s0.max() + p0 <= s1.min()) {
58 GECODE_ME_CHECK(b.zero(home));
59 return home.ES_SUBSUMED(*this);
60 } else if (s1.max() + p1 <= s0.min()) {
61 GECODE_ME_CHECK(b.one(home));
62 return home.ES_SUBSUMED(*this);
63 } else if ((s1.min() + p1 > s0.max()) || b.zero()) {
64 GECODE_ME_CHECK(b.zero(home));
66 (home(*this),OffsetView(s0,p0),s1)));
67 } else if ((s0.min() + p0 > s1.max()) || b.one()) {
68 GECODE_ME_CHECK(b.one(home));
70 (home(*this),OffsetView(s1,p1),s0)));
71 }
72 return ES_FIX;
73 }
74
75 size_t
77 s0.cancel(home,*this,PC_INT_BND);
78 s1.cancel(home,*this,PC_INT_BND);
79 b.cancel(home,*this,PC_INT_VAL);
80 (void) Propagator::dispose(home);
81 return sizeof(*this);
82 }
83
84}}}
85
86// STATISTICS: int-prop
virtual size_t dispose(Space &home)
Delete actor and return its size.
Definition core.hpp:3252
bool zero(void) const
Test whether view is assigned to be zero.
Definition bool.hpp:220
bool one(void) const
Test whether view is assigned to be one.
Definition bool.hpp:224
int min(void) const
Return minimum of domain.
Definition int.hpp:58
int max(void) const
Return maximum of domain.
Definition int.hpp:62
Offset integer view.
Definition view.hpp:443
BoolView b
Boolean view for order.
Definition order.hh:58
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition propagate.cpp:76
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (defined as low binary)
Definition propagate.cpp:44
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition propagate.cpp:39
int p0
Processing times.
Definition order.hh:60
OrderProp(Space &home, OrderProp &p)
Constructor for cloning.
Definition propagate.hpp:67
IntView s0
View for start times.
Definition order.hh:56
virtual void reschedule(Space &home)
Schedule function.
Definition propagate.cpp:49
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition propagate.cpp:56
Less or equal propagator.
Definition rel.hh:493
Propagation cost.
Definition core.hpp:486
static PropCost binary(PropCost::Mod m)
Two variables for modifier pcm.
Definition core.hpp:4809
Computation spaces.
Definition core.hpp:1742
void cancel(Space &home, Propagator &p, PropCond pc)
Cancel subscription of propagator p with propagation condition pc to view.
Definition view.hpp:527
void reschedule(Space &home, Propagator &p, PropCond pc)
Re-schedule propagator p with propagation condition pc.
Definition view.hpp:532
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
const Gecode::PropCond PC_INT_VAL
Propagate when a view becomes assigned (single value)
Definition var-type.hpp:82
const Gecode::PropCond PC_INT_BND
Propagate when minimum or maximum of a view changes.
Definition var-type.hpp:91
Gecode toplevel namespace
ExecStatus
Definition core.hpp:472
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477