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
 *
 *  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
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 *
 */

#ifndef __FLATZINC_OPTION_HH__
#define __FLATZINC_OPTION_HH__

namespace Gecode { namespace FlatZinc {

  template<class Val>
  struct Option {
  private:
    bool _some;
    Val _v;
  public:
    bool operator()(void) const { return _some; }
    const Val& some(void) const { return _v; }
    Val& some(void) { 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