1// (C) Copyright Eric Niebler 2005.
2// Use, modification and distribution are subject to the
3// Boost Software License, Version 1.0. (See accompanying file
4// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
5
6#include <boost/test/unit_test.hpp>
7#include <boost/test/tools/floating_point_comparison.hpp>
8#include <boost/accumulators/accumulators.hpp>
9#include <boost/accumulators/statistics/stats.hpp>
10#include <boost/accumulators/statistics/moment.hpp>
11#include <sstream>
12#include <boost/archive/text_oarchive.hpp>
13#include <boost/archive/text_iarchive.hpp>
14
15using namespace boost;
16using namespace unit_test;
17using namespace accumulators;
18
19///////////////////////////////////////////////////////////////////////////////
20// test_stat
21//
22void test_stat()
23{
24 accumulator_set<int, stats<tag::moment<2> > > acc1;
25
26 acc1(2); // 4
27 acc1(4); // 16
28 acc1(5); // + 25
29 // = 45 / 3 = 15
30
31 BOOST_CHECK_CLOSE(15., accumulators::moment<2>(acc1), 1e-5);
32
33 accumulator_set<int, stats<tag::moment<5> > > acc2;
34
35 acc2(2); // 32
36 acc2(3); // 243
37 acc2(4); // 1024
38 acc2(5); // + 3125
39 // = 4424 / 4 = 1106
40
41 BOOST_CHECK_CLOSE(1106., accumulators::moment<5>(acc2), 1e-5);
42}
43
44///////////////////////////////////////////////////////////////////////////////
45// test_persistency
46//
47void test_persistency()
48{
49 double epsilon = 1e-5;
50 std::stringstream ss;
51 {
52 accumulator_set<int, stats<tag::moment<2> > > acc;
53 acc(2); // 4
54 acc(4); // 16
55 acc(5); // + 25
56 // = 45 / 3 = 15
57 BOOST_CHECK_CLOSE(15., accumulators::moment<2>(acc), epsilon);
58 boost::archive::text_oarchive oa(ss);
59 acc.serialize(ar&: oa, file_version: 0);
60 }
61 accumulator_set<int, stats<tag::moment<2> > > acc;
62 boost::archive::text_iarchive ia(ss);
63 acc.serialize(ar&: ia, file_version: 0);
64 BOOST_CHECK_CLOSE(15., accumulators::moment<2>(acc), epsilon);
65}
66
67///////////////////////////////////////////////////////////////////////////////
68// init_unit_test_suite
69//
70test_suite* init_unit_test_suite( int argc, char* argv[] )
71{
72 test_suite *test = BOOST_TEST_SUITE("moment test");
73
74 test->add(BOOST_TEST_CASE(&test_stat));
75 test->add(BOOST_TEST_CASE(&test_persistency));
76
77 return test;
78}
79
80

source code of boost/libs/accumulators/test/moment.cpp