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1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // rolling_count.hpp | |
3 | // | |
4 | // Copyright 2008 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_ROLLING_COUNT_HPP_EAN_26_12_2008 | |
9 | #define BOOST_ACCUMULATORS_STATISTICS_ROLLING_COUNT_HPP_EAN_26_12_2008 | |
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/numeric/functional.hpp> | |
15 | #include <boost/accumulators/framework/parameters/sample.hpp> | |
16 | #include <boost/accumulators/framework/depends_on.hpp> | |
17 | #include <boost/accumulators/statistics_fwd.hpp> | |
18 | #include <boost/accumulators/statistics/rolling_window.hpp> | |
19 | ||
20 | namespace boost { namespace accumulators | |
21 | { | |
22 | ||
23 | namespace impl | |
24 | { | |
25 | ||
26 | /////////////////////////////////////////////////////////////////////////////// | |
27 | // rolling_count_impl | |
28 | // returns the count of elements in the rolling window | |
29 | template<typename Sample> | |
30 | struct rolling_count_impl | |
31 | : accumulator_base | |
32 | { | |
33 | typedef std::size_t result_type; | |
34 | ||
35 | rolling_count_impl(dont_care) | |
36 | {} | |
37 | ||
38 | template<typename Args> | |
39 | result_type result(Args const &args) const | |
40 | { | |
41 | return static_cast<std::size_t>(rolling_window_plus1(args).size()) - is_rolling_window_plus1_full(args); | |
42 | } | |
43 | }; | |
44 | ||
45 | } // namespace impl | |
46 | ||
47 | /////////////////////////////////////////////////////////////////////////////// | |
48 | // tag::rolling_count | |
49 | // | |
50 | namespace tag | |
51 | { | |
52 | struct rolling_count | |
53 | : depends_on< rolling_window_plus1 > | |
54 | { | |
55 | /// INTERNAL ONLY | |
56 | /// | |
57 | typedef accumulators::impl::rolling_count_impl< mpl::_1 > impl; | |
58 | ||
59 | #ifdef BOOST_ACCUMULATORS_DOXYGEN_INVOKED | |
60 | /// tag::rolling_window::window_size named parameter | |
61 | static boost::parameter::keyword<tag::rolling_window_size> const window_size; | |
62 | #endif | |
63 | }; | |
64 | } // namespace tag | |
65 | ||
66 | /////////////////////////////////////////////////////////////////////////////// | |
67 | // extract::rolling_count | |
68 | // | |
69 | namespace extract | |
70 | { | |
71 | extractor<tag::rolling_count> const rolling_count = {}; | |
72 | ||
73 | BOOST_ACCUMULATORS_IGNORE_GLOBAL(rolling_count) | |
74 | } | |
75 | ||
76 | using extract::rolling_count; | |
77 | ||
78 | }} // namespace boost::accumulators | |
79 | ||
80 | #endif |