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dekker.one
1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Guido Tack <tack@gecode.org>
5 * Vincent Barichard <Vincent.Barichard@univ-angers.fr>
6 *
7 * Copyright:
8 * Guido Tack, 2008
9 * Vincent Barichard, 2012
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 Float { namespace Arithmetic {
37
38 /*
39 * Bounds consistent division operator
40 *
41 */
42 template<class A, class B, class C>
43 forceinline
44 Div<A,B,C>::Div(Home home, A x0, B x1, C x2)
45 : MixTernaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND,C,PC_FLOAT_BND>(home,x0,x1,x2) {}
46
47 template<class A, class B, class C>
48 forceinline
49 Div<A,B,C>::Div(Space& home, Div<A,B,C>& p)
50 : MixTernaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND,C,PC_FLOAT_BND>(home,p) {}
51
52 template<class A, class B, class C>
53 Actor*
54 Div<A,B,C>::copy(Space& home) {
55 return new (home) Div<A,B,C>(home,*this);
56 }
57
58 template<class A, class B, class C>
59 ExecStatus
60 Div<A,B,C>::post(Home home, A x0, B x1, C x2) {
61 GECODE_ME_CHECK(x2.eq(home,x0.domain() / x1.domain()));
62 GECODE_ME_CHECK(x0.eq(home,x2.domain() * x1.domain()));
63 (void) new (home) Div<A,B,C>(home,x0,x1,x2);
64 return ES_OK;
65 }
66
67 template<class A, class B, class C>
68 ExecStatus
69 Div<A,B,C>::propagate(Space& home, const ModEventDelta&) {
70 if (x1.assigned() && (x1.val() == 0)) return ES_FAILED;
71 GECODE_ME_CHECK(x2.eq(home,x0.domain() / x1.domain()));
72 GECODE_ME_CHECK(x0.eq(home,x2.domain() * x1.domain()));
73 if (!x2.assigned() || (x2.val() != 0.0))
74 GECODE_ME_CHECK(x1.eq(home,x0.domain() / x2.domain()));
75 return (x0.assigned() && x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_NOFIX;
76 }
77
78}}}
79
80// STATISTICS: float-prop
81