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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>
37 forceinline
38 LqView<VX,VY,VZ,shr>::LqView(Home home, ViewArray<VX>& x,
39 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>
43 ExecStatus
44 LqView<VX,VY,VZ,shr>::post(Home home, ViewArray<VX>& x,
45 VY y, VZ z, int c) {
46 GECODE_ME_CHECK(z.gq(home,-c));
47 if (z.assigned())
48 return LqInt<VX,VY>::post(home,x,y,z.val()+c);
49 if (sharing(x,y,z))
50 (void) new (home) LqView<VX,VY,VZ,true>(home,x,y,z,c);
51 else
52 (void) new (home) LqView<VX,VY,VZ,false>(home,x,y,z,c);
53 return ES_OK;
54 }
55
56 template<class VX, class VY, class VZ, bool shr>
57 forceinline
58 LqView<VX,VY,VZ,shr>::LqView(Space& home, LqView<VX,VY,VZ,shr>& p)
59 : ViewBase<VX,VY,VZ>(home,p) {}
60
61 template<class VX, class VY, class VZ, bool shr>
62 Actor*
63 LqView<VX,VY,VZ,shr>::copy(Space& home) {
64 return new (home) LqView<VX,VY,VZ,shr>(home,*this);
65 }
66
67 template<class VX, class VY, class VZ, bool shr>
68 ExecStatus
69 LqView<VX,VY,VZ,shr>::propagate(Space& home, const ModEventDelta&) {
70 count(home);
71 GECODE_ME_CHECK(z.gq(home,atleast()));
72
73 if (z.max() == atleast()) {
74 GECODE_ES_CHECK(post_false(home,x,y));
75 return home.ES_SUBSUMED(*this);
76 }
77
78 if (x.size() == 0)
79 return home.ES_SUBSUMED(*this);
80
81 if (z.assigned()) {
82 VY yc(y);
83 GECODE_REWRITE(*this,(LqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
84 }
85
86 return shr ? ES_NOFIX : ES_FIX;
87 }
88
89}}}
90
91// STATISTICS: int-prop