| /** |
| * projectM-qt -- Qt4 based projectM GUI |
| * Copyright (C)2003-2004 projectM Team |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * See 'LICENSE.txt' included within this release |
| * |
| */ |
| |
| #ifndef NULLABLE_HPP |
| #define NULLABLE_HPP |
| |
| template <class Value> |
| class Nullable { |
| public: |
| Nullable(const Value & value) : m_value(value), m_hasValue(true) {} |
| Nullable() :m_hasValue(false) {} |
| |
| Nullable & operator=(const Value & value) { |
| m_value = value; |
| m_hasValue = true; |
| } |
| |
| void nullify() { |
| m_hasValue = false; |
| } |
| |
| const Value & value() const { return m_value;} |
| bool hasValue() const { return m_hasValue;} |
| private: |
| Value m_value; |
| bool m_hasValue; |
| }; |
| #endif |