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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 *
6 * Copyright:
7 * Christian Schulte, 2003
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
34namespace Gecode { namespace Int { namespace Count {
35
36 template<class VX, class VY, class VZ, bool shr, bool dom>
37 forceinline
38 EqView<VX,VY,VZ,shr,dom>::EqView(Home home,
39 ViewArray<VX>& x, VY y, VZ z, int c)
40 : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
41
42 template<class VX, class VY, class VZ, bool shr, bool dom>
43 ExecStatus
44 EqView<VX,VY,VZ,shr,dom>::post(Home home,
45 ViewArray<VX>& x, VY y, VZ z, int c) {
46 GECODE_ME_CHECK(z.gq(home,-c));
47 GECODE_ME_CHECK(z.lq(home,x.size()-c));
48 if (isval(y) && z.assigned())
49 return EqInt<VX,VY>::post(home,x,y,z.val()+c);
50 if (sharing(x,y,z))
51 (void) new (home) EqView<VX,VY,VZ,true,dom>(home,x,y,z,c);
52 else
53 (void) new (home) EqView<VX,VY,VZ,false,dom>(home,x,y,z,c);
54 return ES_OK;
55 }
56
57 template<class VX, class VY, class VZ, bool shr, bool dom>
58 forceinline
59 EqView<VX,VY,VZ,shr,dom>::EqView(Space& home, EqView<VX,VY,VZ,shr,dom>& p)
60 : ViewBase<VX,VY,VZ>(home,p) {}
61
62 template<class VX, class VY, class VZ, bool shr, bool dom>
63 Actor*
64 EqView<VX,VY,VZ,shr,dom>::copy(Space& home) {
65 return new (home) EqView<VX,VY,VZ,shr,dom>(home,*this);
66 }
67
68 template<class VX, class VY, class VZ, bool shr, bool dom>
69 ExecStatus
70 EqView<VX,VY,VZ,shr,dom>::propagate(Space& home, const ModEventDelta&) {
71 count(home);
72
73 GECODE_ME_CHECK(z.gq(home,atleast()));
74 GECODE_ME_CHECK(z.lq(home,atmost()));
75
76 if (z.assigned()) {
77 if (z.val() == atleast()) {
78 GECODE_ES_CHECK(post_false(home,x,y));
79 return home.ES_SUBSUMED(*this);
80 }
81 if (z.val() == atmost()) {
82 GECODE_ES_CHECK(post_true(home,x,y));
83 return home.ES_SUBSUMED(*this);
84 }
85 if (!dom || isval(y)) {
86 VY yc(y);
87 GECODE_REWRITE(*this,(EqInt<VX,VY>
88 ::post(home(*this),x,yc,z.val()+c)));
89 }
90 }
91
92
93 if (dom && !isval(y) && (z.min() > 0)) {
94 /*
95 * Only if the propagator is at fixpoint here, continue
96 * when things are shared: the reason is that prune
97 * requires that the views in x overlap with y!
98 */
99 if (shr && (VX::me(Propagator::modeventdelta()) != ME_INT_NONE))
100 return ES_NOFIX;
101
102 GECODE_ES_CHECK(prune(home,x,y));
103
104 return ES_NOFIX;
105 }
106
107 return shr ? ES_NOFIX : ES_FIX;
108 }
109
110}}}
111
112// STATISTICS: int-prop