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

 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
17namespace boost { namespace accumulators
18{
19
20namespace 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//
55namespace 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//
69namespace extract
70{
71    extractor<tag::count> const count = {};
72
73    BOOST_ACCUMULATORS_IGNORE_GLOBAL(count)
74}
75
76using extract::count;
77
78}} // namespace boost::accumulators
79
80#endif