Averager.h

#ifndef _theplu_yat_statistics_averager_
#define _theplu_yat_statistics_averager_

// $Id: Averager.h 3550 2017-01-03 05:41:02Z peter $

/*
  Copyright (C) 2004 Jari Häkkinen, Peter Johansson
  Copyright (C) 2005, 2006 Jari Häkkinen, Peter Johansson, Markus Ringnér
  Copyright (C) 2007, 2008 Jari Häkkinen, Peter Johansson
  Copyright (C) 2009, 2010, 2011, 2012, 2016 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 "averager_base.h"

#include "yat/utility/iterator_traits.h"

#include <boost/concept_check.hpp>
#include <boost/iterator/iterator_concepts.hpp>

#include <cmath>

namespace theplu{
namespace yat{
namespace statistics{

  class Averager : public averager_base2<Averager>
  {
  public:

    Averager(void);

    Averager(double x, double xx, long n);

    Averager(const Averager& a);

    const Averager& operator=(const Averager&);

    template<class Derived>
    const Averager& operator+=(const averager_base2<Derived>& other);

  private:
    friend class averager_base<Averager>;
    void add_impl(double, long int);
    void rescale_impl(double);
  };


  template <typename InputIterator>
  void add(Averager& a, InputIterator first, InputIterator last)
  {
    BOOST_CONCEPT_ASSERT((boost_concepts::ReadableIterator<InputIterator>));
    BOOST_CONCEPT_ASSERT((boost_concepts::SinglePassIterator<InputIterator>));
    typedef typename boost::iterator_value<InputIterator>::type T;
    BOOST_CONCEPT_ASSERT((boost::Convertible<T, double>));
    utility::check_iterator_is_unweighted(first);
    for ( ; first != last; ++first)
      a.add(*first);
  }

  // template implementation
  template<class Derived>
  const Averager& Averager::operator+=(const averager_base2<Derived>& other)
  {
    if (other.n())
      add2(other.mean(), other.sum_xx_centered(), other.n());
    return *this;
  }


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

#endif