Nothing.h

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00001 /***************************************************************************
00002  *
00003  * Copyright (C) 2009-2010 Cassio Neri Moreira
00004  *
00005  * This file is part of the KeyValue library.
00006  *
00007  * The KeyValue library is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License as published
00009  * by the Free Software Foundation, either version 3 of the License, or (at
00010  * your option) any later version.
00011  *
00012  * The KeyValue library is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
00015  * Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License along
00018  * with KeyValue. If not, see <http://www.gnu.org/licenses/>.
00019  *
00020  **************************************************************************/
00021 
00028 #ifndef KEYVALUE_VALUE_NOTHING_H_
00029 #define KEYVALUE_VALUE_NOTHING_H_
00030 
00031 #include <iosfwd>
00032 
00033 namespace keyvalue {
00034 namespace value {
00035 
00041 class Nothing {
00045 };
00046 
00052 std::ostream&
00053 operator<<(std::ostream& os, const Nothing& nothing);
00054 
00055 } // namespace value
00056 } // namespace keyvalue
00057 
00058 #endif // KEYVALUE_VALUE_NOTHING_H_