00001 // This file is a part of Aurelia. 00002 // Copyright (C) 2010 Valentin David 00003 // Copyright (C) 2010 University of Bergen 00004 // 00005 // This program is free software: you can redistribute it and/or modify 00006 // it under the terms of the GNU General Public License as published by 00007 // the Free Software Foundation, either version 3 of the License, or 00008 // (at your option) any later version. 00009 // 00010 // This program is distributed in the hope that it will be useful, 00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 // GNU General Public License for more details. 00014 // 00015 // You should have received a copy of the GNU General Public License 00016 // along with this program. If not, see <http://www.gnu.org/licenses/>. 00017 #ifndef __ENSURE_HH 00018 # define __ENSURE_HH 00019 00020 # include "../failure.hh" 00021 00022 namespace aurelia { 00023 00024 template <typename Strat, typename T> 00025 struct only_for_strategy { 00026 Strat s; 00027 only_for_strategy(const Strat& s): s(s) {} 00028 template <typename T> 00029 struct ensure { 00030 T operator()(T&& in) const { 00031 return std::move(in); 00032 } 00033 00034 T operator()(const T& in) const { 00035 return in; 00036 } 00037 00038 template <typename U> 00039 T operator()(U) const { 00040 throw failure(); 00041 } 00042 }; 00043 00044 } 00045 00046 #endif