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option.hh

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Guido Tack <tack@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Guido Tack, 2007
00008  *
00009  *  Last modified:
00010  *     $Date: 2014-08-07 05:31:59 +0200 (Thu, 07 Aug 2014) $ by $Author: tack $
00011  *     $Revision: 14189 $
00012  *
00013  *  This file is part of Gecode, the generic constraint
00014  *  development environment:
00015  *     http://www.gecode.org
00016  *
00017  *  Permission is hereby granted, free of charge, to any person obtaining
00018  *  a copy of this software and associated documentation files (the
00019  *  "Software"), to deal in the Software without restriction, including
00020  *  without limitation the rights to use, copy, modify, merge, publish,
00021  *  distribute, sublicense, and/or sell copies of the Software, and to
00022  *  permit persons to whom the Software is furnished to do so, subject to
00023  *  the following conditions:
00024  *
00025  *  The above copyright notice and this permission notice shall be
00026  *  included in all copies or substantial portions of the Software.
00027  *
00028  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00029  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00030  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00031  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00032  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00033  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00034  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00035  *
00036  */
00037 
00038 #ifndef __FLATZINC_OPTION_HH__
00039 #define __FLATZINC_OPTION_HH__
00040 
00041 namespace Gecode { namespace FlatZinc {
00042 
00044   template<class Val>
00045   struct Option {
00046   private:
00047     bool _some;
00048     Val _v;
00049   public:
00050     bool operator()(void) const { return _some; }
00051     const Val& some(void) const { return _v; }
00052     Val& some(void) { return _v; }
00053     static Option<Val> none(void) {
00054       Option<Val> o;
00055       o._some = false;
00056       new (&o._v) Val();
00057       return o;
00058     }
00059     static Option<Val> some(const Val& v) {
00060       Option<Val> o;
00061       o._some = true;
00062       o._v = v;
00063       return o;
00064     }
00065   };
00066 
00067 }}
00068 
00069 #endif
00070 
00071 // STATISTICS: flatzinc-any