option.hh
Go to the documentation of this file.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: 2009-09-10 11:25:57 +0200 (Thu, 10 Sep 2009) $ by $Author: tack $ 00011 * $Revision: 9698 $ 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 static Option<Val> none(void) { 00053 Option<Val> o; 00054 o._some = false; 00055 new (&o._v) Val(); 00056 return o; 00057 } 00058 static Option<Val> some(const Val& v) { 00059 Option<Val> o; 00060 o._some = true; 00061 o._v = v; 00062 return o; 00063 } 00064 }; 00065 00066 }} 00067 00068 #endif 00069 00070 // STATISTICS: flatzinc-any