1 ///////////////////////////////////////////////////////////////////////////////
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)
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
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>
20 namespace boost { namespace accumulators
25 ///////////////////////////////////////////////////////////////////////////////
27 template<typename Sample, typename Variance>
28 struct error_of_mean_impl
31 // for boost::result_of
32 typedef typename numeric::functional::fdiv<Sample, std::size_t>::result_type result_type;
34 error_of_mean_impl(dont_care) {}
36 template<typename Args>
37 result_type result(Args const &args) const
40 extractor<Variance> const variance = {};
41 return sqrt(numeric::fdiv(variance(args), count(args) - 1));
47 ///////////////////////////////////////////////////////////////////////////////
54 : depends_on<lazy_variance, count>
58 typedef accumulators::impl::error_of_mean_impl<mpl::_1, lazy_variance> impl;
62 struct error_of<immediate_mean>
63 : depends_on<variance, count>
67 typedef accumulators::impl::error_of_mean_impl<mpl::_1, variance> impl;
71 }} // namespace boost::accumulators