Single.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
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 **************************************************************************/

#ifndef KEYVALUE_VALUE_SINGLE_H_
#define KEYVALUE_VALUE_SINGLE_H_

#include <iosfwd>

#include "keyvalue/value/Vector.h"

namespace keyvalue {
namespace value {

class Single : public Vector {

public:

  Single();

  Single(const Variant& data);

  template <typename Rhs>
  Single(const Rhs& rhs);

  template <typename Rhs>
  Single&
  operator=(const Rhs& rhs);

}; // class Single

::std::ostream&
operator<<(::std::ostream& os, const Single& rhs);

template <typename Rhs>
struct Parent;

template <>
struct Parent<Variant> {
  typedef Single Type_;
};

/*--------------------------------------------------------------------------
 * Single()
 *------------------------------------------------------------------------*/

template <typename Rhs>
Single::Single(const Rhs& rhs) : Vector(1) {

  /*
   * If you get an error here about 'keyvalue::value::Parent<Rhs>', this
   * means that Rhs isn't in a lower level in the hierarchy.
   */

  (*this)(0) = Variant(rhs);
}

/*--------------------------------------------------------------------------
 * operator=()
 *------------------------------------------------------------------------*/

template <typename Rhs>
Single&
Single::operator=(const Rhs& rhs) {

  /*
   * If you get an error here about 'keyvalue::value::Parent<Rhs>', this
   * means that Rhs isn't in a lower level in the hierarchy.
   */

  return *this = typename Parent<Rhs>::Type_(rhs);
}

} // namespace value
} // namespace keyvalue

#endif // KEYVALUE_VALUE_SINGLE_H_