Saver.h

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/***************************************************************************
 *
 * Copyright (C) 2009-2011 Cassio Neri Moreira
 *
 * This file is part of the KeyValue library.
 *
 * The KeyValue 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 3 of the License, or (at
 * your option) any later version.
 *
 * The KeyValue 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 General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with KeyValue. If not, see <http://www.gnu.org/licenses/>.
 *
 * If you modify this library, or any covered work, by linking or combining
 * it with Excel (or a modified version of that program), containing parts
 * covered by the terms of End-User License Agreement for Microsoft
 * Software, the licensors of KeyValue grant you additional permission to
 * convey the resulting work.
 *
 **************************************************************************/

#ifndef KEYVALUE_UTIL_SAVER_H_
#define KEYVALUE_UTIL_SAVER_H_

#include <boost/utility.hpp>

namespace keyvalue {
namespace util {

template <typename SavedType>
class Saver : private ::boost::noncopyable {

public:

  explicit
  Saver(SavedType& data);

  Saver(SavedType& data, const SavedType& onExit);

  ~Saver();

  SavedType
  getSaved() const;

private:

  SavedType& data_;
  SavedType  onExit_;

}; // class Saver

/*--------------------------------------------------------------------------
 * Saver()
 *------------------------------------------------------------------------*/

template <typename SavedType>
Saver<SavedType>::Saver(SavedType& data) :
  data_(data),
  onExit_(data_) {
}

template <typename SavedType>
Saver<SavedType>::Saver(SavedType& data, const SavedType& onExit) :
  data_(data),
  onExit_(onExit) {
}

/*--------------------------------------------------------------------------
 * ~Saver()
 *------------------------------------------------------------------------*/

template <typename SavedType>
Saver<SavedType>::~Saver() {
  data_ = onExit_;
}

/*--------------------------------------------------------------------------
 * Saver()
 *------------------------------------------------------------------------*/

template <typename SavedType>
SavedType
Saver<SavedType>::getSaved() const {
  return onExit_;
}

} // namespace util
} // namespace keyvalue

#endif // KEYVALUE_UTIL_SAVER_H_