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option.hh
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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
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33 
34 #ifndef __FLATZINC_OPTION_HH__
35 #define __FLATZINC_OPTION_HH__
36 
37 namespace Gecode { namespace FlatZinc {
38 
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
bool operator()(void) const
Definition: option.hh:46
Optional value.
Definition: option.hh:41
Gecode toplevel namespace
Val & some(void)
Definition: option.hh:48
static Option< Val > none(void)
Definition: option.hh:49
const int v[7]
Definition: distinct.cpp:259
static Option< Val > some(const Val &v)
Definition: option.hh:55
const Val & some(void) const
Definition: option.hh:47