source: trunk/yat/utility/DataWeight.h @ 1797

#ifndef _theplu_yat_utility_data_weight_
#define _theplu_yat_utility_data_weight_ 

// $Id: DataWeight.h 1797 2009-02-12 18:07:10Z peter $

/*
  Copyright (C) 2008 Jari Häkkinen, Peter Johansson
  Copyright (C) 2009 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/>.
*/

namespace theplu {
namespace yat {
namespace utility {

  /**
     \brief Holds a pair of data and associated weight

     The class has comparison operators (declared outside class) that
     are designed to ignore the weights, and behaves like the
     corresponding double operator behaves for data().

     \since New in yat 0.5
  */
  class DataWeight
  {
  public:
    /**
       \brief Default constructor

       \param data data value to hold
       \param weight weight value to hold
     */
    explicit DataWeight(double data=0.0, double weight=1.0);

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

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

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

    /**
       \return const reference to weight
     */
    const double& weight(void) const;
  private:
    double data_;
    double weight_;
    // using compiler generated copy
    // DataWeight(const DataWeight&)
    // DataWeight& operator=(const DataWeight&);
  };

  /**
     \brief equality operator

     \return true if lhs.data() == rhs.data()
   */
  bool operator==(const DataWeight& lhs, const DataWeight& rhs);

  /**
     \brief inequality operator

     \return true if lhs.data() != rhs.data()
   */
  bool operator!=(const DataWeight&, const DataWeight&);

  /**
     \brief comparison operator

     \return true if lhs data is less than rhs data
   */
  bool operator<(const DataWeight&, const DataWeight&);

  /**
     \brief comparison operator

     \return true if lhs data is greater than rhs data
   */
  bool operator>(const DataWeight&, const DataWeight&);

  /**
     \brief comparison operator

     \return true if lhs.data() <= rhs.data()
   */
  bool operator<=(const DataWeight&, const DataWeight&);

  /**
     \brief comparison operator

     \return true if lhs.data() >= rhs.data()
   */
  bool operator>=(const DataWeight&, const DataWeight&);


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

#endif