gcc/libstdc++-v3/testsuite/util/statistic/sample_mean.hpp

// -*- C++ -*-

// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
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// version.

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// General Public License for more details.

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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

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/**
 * @file sample_mean.hpp
 * Contains a function for calculating a sample mean
 */

#ifndef PB_DS_SAMPLE_MEAN_HPP
#define PB_DS_SAMPLE_MEAN_HPP

#include <list>
#include <numeric>
#include <math.h>
#include <iterator>

namespace __gnu_pbds
{
  namespace test
  {
    namespace detail
    {
#define PB_DS_VTYPE typename std::iterator_traits<It>::value_type

      template<typename It>
      PB_DS_VTYPE
      sample_mean(It b, It e)
      {
	const PB_DS_VTYPE total = std::accumulate(b, e, PB_DS_VTYPE(0));
	const size_t num = std::distance(b, e);
	return total / num;
      }

#undef PB_DS_VTYPE

    } // namespace detail
  } // namespace test
} // namespace __gnu_pbds

#endif