option.hh
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Guido Tack <tack@gecode.org>
*
* Copyright:
* Guido Tack, 2007
*
* Last modified:
* $Date: 2010-07-02 19:18:43 +1000 (Fri, 02 Jul 2010) $ by $Author: tack $
* $Revision: 11149 $
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef __FLATZINC_OPTION_HH__
#define __FLATZINC_OPTION_HH__
namespace FlatZinc {
/// Optional value
template<class Val>
struct Option {
private:
bool _some;
Val _v;
public:
bool operator()(void) const { return _some; }
const Val& some(void) const { return _v; }
static Option<Val> none(void) {
Option<Val> o;
o._some = false;
new (&o._v) Val();
return o;
}
static Option<Val> some(const Val& v) {
Option<Val> o;
o._some = true;
o._v = v;
return o;
}
};
}
#endif
// STATISTICS: flatzinc-any