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