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dekker.one
1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christian Schulte <schulte@gecode.org>
5 * Guido Tack <tack@gecode.org>
6 *
7 * Copyright:
8 * Christian Schulte, 2009
9 * Guido Tack, 2010
10 *
11 * This file is part of Gecode, the generic constraint
12 * development environment:
13 * http://www.gecode.org
14 *
15 * Permission is hereby granted, free of charge, to any person obtaining
16 * a copy of this software and associated documentation files (the
17 * "Software"), to deal in the Software without restriction, including
18 * without limitation the rights to use, copy, modify, merge, publish,
19 * distribute, sublicense, and/or sell copies of the Software, and to
20 * permit persons to whom the Software is furnished to do so, subject to
21 * the following conditions:
22 *
23 * The above copyright notice and this permission notice shall be
24 * included in all copies or substantial portions of the Software.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
30 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
31 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
32 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 *
34 */
35
36namespace Gecode { namespace Int { namespace Cumulative {
37
38 template<class ManTask, class Cap, class PL>
39 forceinline
40 ManProp<ManTask,Cap,PL>::ManProp(Home home, Cap c0, TaskArray<ManTask>& t)
41 : TaskProp<ManTask,PL>(home,t), c(c0) {
42 c.subscribe(home,*this,PC_INT_BND);
43 }
44
45 template<class ManTask, class Cap, class PL>
46 forceinline
47 ManProp<ManTask,Cap,PL>::ManProp(Space& home, ManProp<ManTask,Cap,PL>& p)
48 : TaskProp<ManTask,PL>(home,p) {
49 c.update(home,p.c);
50 }
51
52 template<class ManTask, class Cap, class PL>
53 ExecStatus
54 ManProp<ManTask,Cap,PL>::post(Home home, Cap c, TaskArray<ManTask>& t) {
55 // Capacity must be nonnegative
56 GECODE_ME_CHECK(c.gq(home, 0));
57 // Check that tasks do not overload resource
58 for (int i=0; i<t.size(); i++)
59 if (t[i].c() > c.max())
60 return ES_FAILED;
61 if (t.size() == 1)
62 GECODE_ME_CHECK(c.gq(home, t[0].c()));
63 if (t.size() > 1) {
64 if (c.assigned() && c.val()==1) {
65 TaskArray<typename TaskTraits<ManTask>::UnaryTask> mt(home,t.size());
66 for (int i=0; i<t.size(); i++)
67 mt[i]=t[i];
68 return Unary::ManProp<typename TaskTraits<ManTask>::UnaryTask,PL>
69 ::post(home,mt);
70 } else {
71 (void) new (home) ManProp<ManTask,Cap,PL>(home,c,t);
72 }
73 }
74 return ES_OK;
75 }
76
77 template<class ManTask, class Cap, class PL>
78 Actor*
79 ManProp<ManTask,Cap,PL>::copy(Space& home) {
80 return new (home) ManProp<ManTask,Cap,PL>(home,*this);
81 }
82
83 template<class ManTask, class Cap, class PL>
84 forceinline size_t
85 ManProp<ManTask,Cap,PL>::dispose(Space& home) {
86 (void) TaskProp<ManTask,PL>::dispose(home);
87 c.cancel(home,*this,PC_INT_BND);
88 return sizeof(*this);
89 }
90
91 template<class ManTask, class Cap, class PL>
92 ExecStatus
93 ManProp<ManTask,Cap,PL>::propagate(Space& home, const ModEventDelta& med) {
94 // Only bounds changes?
95 if (IntView::me(med) != ME_INT_DOM)
96 GECODE_ES_CHECK(overload(home,c.max(),t));
97
98 if (PL::advanced)
99 GECODE_ES_CHECK(edgefinding(home,c.max(),t));
100
101 if (PL::basic)
102 GECODE_ES_CHECK(timetabling(home,*this,c,t));
103
104 if (Cap::varderived() && c.assigned() && (c.val() == 1)) {
105 // Check that tasks do not overload resource
106 for (int i=0; i<t.size(); i++)
107 if (t[i].c() > 1)
108 return ES_FAILED;
109 // Rewrite to unary resource constraint
110 TaskArray<typename TaskTraits<ManTask>::UnaryTask> ut(home,t.size());
111 for (int i=0; i<t.size(); i++)
112 ut[i]=t[i];
113 GECODE_REWRITE(*this,
114 (Unary::ManProp<typename TaskTraits<ManTask>::UnaryTask,PL>
115 ::post(home(*this),ut)));
116 }
117
118 if (!PL::basic && c.assigned())
119 GECODE_ES_CHECK(subsumed(home,*this,c.val(),t));
120
121 return ES_NOFIX;
122 }
123
124}}}
125
126// STATISTICS: int-prop