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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 *
6 * Copyright:
7 * Guido Tack, 2007
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
34#ifndef FLATZINC_OPTION_HH
35#define FLATZINC_OPTION_HH
36
37namespace Gecode { namespace FlatZinc {
38
39 /// Optional value
40 template<class Val>
41 struct Option {
42 private:
43 bool _some;
44 Val _v;
45 public:
46 bool operator()(void) const { return _some; }
47 const Val& some(void) const { return _v; }
48 Val& some(void) { return _v; }
49 static Option<Val> none(void) {
50 Option<Val> o;
51 o._some = false;
52 new (&o._v) Val();
53 return o;
54 }
55 static Option<Val> some(const Val& v) {
56 Option<Val> o;
57 o._some = true;
58 o._v = v;
59 return o;
60 }
61 };
62
63}}
64
65#endif
66
67// STATISTICS: flatzinc-any