| 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 | // make this accumulator serializeable |
| 47 | template<class Archive> |
| 48 | void serialize(Archive & ar, const unsigned int /* file_version */) |
| 49 | { |
| 50 | ar & cnt; |
| 51 | } |
| 52 | |
| 53 | private: |
| 54 | std::size_t cnt; |
| 55 | }; |
| 56 | |
| 57 | } // namespace impl |
| 58 | |
| 59 | /////////////////////////////////////////////////////////////////////////////// |
| 60 | // tag::count |
| 61 | // |
| 62 | namespace tag |
| 63 | { |
| 64 | struct count |
| 65 | : depends_on<> |
| 66 | { |
| 67 | /// INTERNAL ONLY |
| 68 | /// |
| 69 | typedef mpl::always<accumulators::impl::count_impl> impl; |
| 70 | }; |
| 71 | } |
| 72 | |
| 73 | /////////////////////////////////////////////////////////////////////////////// |
| 74 | // extract::count |
| 75 | // |
| 76 | namespace extract |
| 77 | { |
| 78 | extractor<tag::count> const count = {}; |
| 79 | |
| 80 | BOOST_ACCUMULATORS_IGNORE_GLOBAL(count) |
| 81 | } |
| 82 | |
| 83 | using extract::count; |
| 84 | |
| 85 | }} // namespace boost::accumulators |
| 86 | |
| 87 | #endif |
| 88 |