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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, 2012
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 {
35
36 /// Combine variable selection criteria for tie-breaking
37 template<class VarBranch>
38 class TieBreak {
39 public:
40 /// Branching criteria to try in order
41 VarBranch a, b, c, d;
42 /// Initialize with variable selection criteria
43 TieBreak(VarBranch a0 = VarBranch(),
44 VarBranch b0 = VarBranch(),
45 VarBranch c0 = VarBranch(),
46 VarBranch d0 = VarBranch());
47 };
48
49 /**
50 * \defgroup TaskModelBranchTieBreak Tie-breaking for variable selection
51 *
52 * \ingroup TaskModelBranch
53 */
54 //@{
55 /// Combine variable selection criteria \a a and \a b for tie-breaking
56 template<class VarBranch>
57 TieBreak<VarBranch>
58 tiebreak(VarBranch a, VarBranch b);
59 /// Combine variable selection criteria \a a, \a b, and \a c for tie-breaking
60 template<class VarBranch>
61 TieBreak<VarBranch>
62 tiebreak(VarBranch a, VarBranch b, VarBranch c);
63 /// Combine variable selection criteria \a a, \a b, \a c, and \a d for tie-breaking
64 template<class VarBranch>
65 TieBreak<VarBranch>
66 tiebreak(VarBranch a, VarBranch b, VarBranch c, VarBranch d);
67 //@}
68
69
70 template<class VarBranch>
71 forceinline
72 TieBreak<VarBranch>::TieBreak(VarBranch a0,
73 VarBranch b0,
74 VarBranch c0,
75 VarBranch d0)
76 : a(a0), b(b0), c(c0), d(d0) {}
77
78 template<class VarBranch>
79 TieBreak<VarBranch>
80 tiebreak(VarBranch a, VarBranch b) {
81 TieBreak<VarBranch> ab(a,b);
82 return ab;
83 }
84
85 template<class VarBranch>
86 TieBreak<VarBranch>
87 tiebreak(VarBranch a, VarBranch b, VarBranch c) {
88 TieBreak<VarBranch> abc(a,b,c);
89 return abc;
90 }
91
92 template<class VarBranch>
93 TieBreak<VarBranch>
94 tiebreak(VarBranch a, VarBranch b, VarBranch c, VarBranch d) {
95 TieBreak<VarBranch> abcd(a,b,c,d);
96 return abcd;
97 }
98
99}
100
101// STATISTICS: kernel-branch