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1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // count.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_COUNT_HPP_EAN_28_10_2005 | |
9 | #define BOOST_ACCUMULATORS_STATISTICS_COUNT_HPP_EAN_28_10_2005 | |
10 | ||
11 | #include <boost/mpl/always.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 | ||
17 | namespace boost { namespace accumulators | |
18 | { | |
19 | ||
20 | namespace impl | |
21 | { | |
22 | ||
23 | /////////////////////////////////////////////////////////////////////////////// | |
24 | // count_impl | |
25 | struct count_impl | |
26 | : accumulator_base | |
27 | { | |
28 | // for boost::result_of | |
29 | typedef std::size_t result_type; | |
30 | ||
31 | count_impl(dont_care) | |
32 | : cnt(0) | |
33 | { | |
34 | } | |
35 | ||
36 | void operator ()(dont_care) | |
37 | { | |
38 | ++this->cnt; | |
39 | } | |
40 | ||
41 | result_type result(dont_care) const | |
42 | { | |
43 | return this->cnt; | |
44 | } | |
45 | ||
46 | private: | |
47 | std::size_t cnt; | |
48 | }; | |
49 | ||
50 | } // namespace impl | |
51 | ||
52 | /////////////////////////////////////////////////////////////////////////////// | |
53 | // tag::count | |
54 | // | |
55 | namespace tag | |
56 | { | |
57 | struct count | |
58 | : depends_on<> | |
59 | { | |
60 | /// INTERNAL ONLY | |
61 | /// | |
62 | typedef mpl::always<accumulators::impl::count_impl> impl; | |
63 | }; | |
64 | } | |
65 | ||
66 | /////////////////////////////////////////////////////////////////////////////// | |
67 | // extract::count | |
68 | // | |
69 | namespace extract | |
70 | { | |
71 | extractor<tag::count> const count = {}; | |
72 | ||
73 | BOOST_ACCUMULATORS_IGNORE_GLOBAL(count) | |
74 | } | |
75 | ||
76 | using extract::count; | |
77 | ||
78 | }} // namespace boost::accumulators | |
79 | ||
80 | #endif |