1// (C) Copyright Simon West 2011.
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/accumulators/accumulators.hpp>
8#include <boost/accumulators/statistics/stats.hpp>
9#include <boost/accumulators/statistics/weighted_sum_kahan.hpp>
10#include <boost/accumulators/statistics/variates/covariate.hpp>
11
12using namespace boost;
13using namespace unit_test;
14using namespace accumulators;
15
16///////////////////////////////////////////////////////////////////////////////
17// test_weighted_sum_kahan
18//
19void test_weighted_sum_kahan()
20{
21 accumulator_set<float, stats<tag::weighted_sum_kahan>, float > acc;
22
23 BOOST_CHECK_EQUAL(0.0f, weighted_sum_kahan(acc));
24
25 for (size_t i = 0; i < 1e6; ++i) {
26 acc(1, weight = 1e-6f);
27 }
28
29 BOOST_CHECK_EQUAL(1.0f, weighted_sum_kahan(acc));
30}
31
32///////////////////////////////////////////////////////////////////////////////
33// test_weighted_sum_of_variates_kahan
34//
35void test_weighted_sum_of_variates_kahan()
36{
37 accumulator_set<
38 float,
39 stats<tag::weighted_sum_of_variates_kahan<float, tag::covariate1> >,
40 float
41 >
42 acc;
43
44 BOOST_CHECK_EQUAL(0.0f, weighted_sum_of_variates_kahan(acc));
45
46 for (size_t i = 0; i < 1e6; ++i) {
47 acc(0, weight = 1.0f, covariate1 = 1e-6f);
48 }
49
50 BOOST_CHECK_EQUAL(1.0f, weighted_sum_of_variates_kahan(acc));
51}
52
53///////////////////////////////////////////////////////////////////////////////
54// init_unit_test_suite
55//
56test_suite* init_unit_test_suite( int argc, char* argv[] )
57{
58 test_suite *test = BOOST_TEST_SUITE("weighted sum kahan tests");
59
60 test->add(BOOST_TEST_CASE(&test_weighted_sum_kahan));
61 test->add(BOOST_TEST_CASE(&test_weighted_sum_of_variates_kahan));
62
63 return test;
64}
65

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