source: trunk/yat/utility/DataWeightProxy.h @ 1537

#ifndef _theplu_yat_utility_data_weight_proxy_
#define _theplu_yat_utility_data_weight_proxy_ 

// $Id: DataWeightProxy.h 1537 2008-09-26 22:37:33Z peter $

/*
  Copyright (C) 2008 Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat 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 yat 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 yat. If not, see <http://www.gnu.org/licenses/>.
*/

#include "DataWeight.h"

namespace theplu {
namespace yat {
namespace utility {

  /**
     \internal

     \brief Proxy class for DataWeight

     DataIterator and WeightIterator should be a TrivialIterator
  */
  template<typename DataIterator, typename WeightIterator>
  class DataWeightProxy
  {
  public:
    /**
       \brief Default constructor

       \param data iterator pointing to data to hold
       \param weight iterator pointing to weight to hold
     */
    DataWeightProxy(DataIterator data, WeightIterator weight)
      : data_(data), weight_(weight) {}

    /**
       \return reference to data
     */
    double& data(void) { return *data_; }

    /**
       \return const reference to data
     */
    const double& data(void) const { return *data_ ; }

    /**
       \return reference to weight
     */
    double& weight(void) { return *weight_; }

    /**
       \return const reference to weight
     */
    const double& weight(void) const { return *weight_; }

    /**
       \brief assignment operator
     */
    DataWeightProxy& operator=(const DataWeight& rhs)
    {
      data() = rhs.data();
      weight() = rhs.weight();
      return *this;
    }

    /**
       \brief Conversion to DataWeight
     */
    operator DataWeight() const { return DataWeight(data(), weight()); }

  private:
    DataIterator data_;
    WeightIterator weight_;

    // using compiler generated copy and assignment
    //DataWeightProxy& operator=(const DataWeightProxy&);
    //DataWeightProxy(const DataWeightProxy&);
  };

  
  /**
     \brief equality operator
   */
  template<typename DataIterator, typename WeightIterator>
  bool operator==(const DataWeightProxy<DataIterator, WeightIterator>& lhs,
                  const DataWeightProxy<DataIterator, WeightIterator>& rhs)
  {
    return lhs.data()==rhs.data() && lhs.weight()==rhs.weight();
  }

}}} // of namespace utility, yat, and theplu

#endif