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/Src/Dependencies/Boost/boost/accumulators/statistics/error_of_mean.hpp

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 1///////////////////////////////////////////////////////////////////////////////
 2// error_of.hpp
 3//
 4//  Copyright 2005 Eric Niebler. Distributed under the Boost
 5//  Software License, Version 1.0. (See accompanying file
 6//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 7
 8#ifndef BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_MEAN_HPP_EAN_27_03_2006
 9#define BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_MEAN_HPP_EAN_27_03_2006
10
11#include <boost/mpl/placeholders.hpp>
12#include <boost/accumulators/framework/accumulator_base.hpp>
13#include <boost/accumulators/framework/extractor.hpp>
14#include <boost/accumulators/framework/depends_on.hpp>
15#include <boost/accumulators/statistics_fwd.hpp>
16#include <boost/accumulators/statistics/error_of.hpp>
17#include <boost/accumulators/statistics/variance.hpp>
18#include <boost/accumulators/statistics/count.hpp>
19
20namespace boost { namespace accumulators
21{
22
23namespace impl
24{
25    ///////////////////////////////////////////////////////////////////////////////
26    // error_of_mean_impl
27    template<typename Sample, typename Variance>
28    struct error_of_mean_impl
29      : accumulator_base
30    {
31        // for boost::result_of
32        typedef typename numeric::functional::average<Sample, std::size_t>::result_type result_type;
33
34        error_of_mean_impl(dont_care) {}
35
36        template<typename Args>
37        result_type result(Args const &args) const
38        {
39            using namespace std;
40            extractor<Variance> const variance = {};
41            return sqrt(numeric::average(variance(args), count(args) - 1));
42        }
43    };
44
45} // namespace impl
46
47///////////////////////////////////////////////////////////////////////////////
48// tag::error_of
49//
50namespace tag
51{
52    template<>
53    struct error_of<mean>
54      : depends_on<lazy_variance, count>
55    {
56        /// INTERNAL ONLY
57        ///
58        typedef accumulators::impl::error_of_mean_impl<mpl::_1, lazy_variance> impl;
59    };
60
61    template<>
62    struct error_of<immediate_mean>
63      : depends_on<variance, count>
64    {
65        /// INTERNAL ONLY
66        ///
67        typedef accumulators::impl::error_of_mean_impl<mpl::_1, variance> impl;
68    };
69}
70
71}} // namespace boost::accumulators
72
73#endif