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/weighted_mean.hpp>
11
12using namespace boost;
13using namespace unit_test;
14using namespace accumulators;
15
16///////////////////////////////////////////////////////////////////////////////
17// test_stat
18//
19void test_stat()
20{
21 accumulator_set<int, stats<tag::weighted_mean>, external<int> > acc;
22 accumulator_set<void, stats<tag::sum_of_weights>, int> weight_acc;
23
24 acc(10, weight = 2); // 20
25 weight_acc(weight = 2); //
26 BOOST_CHECK_EQUAL(2, sum_of_weights(weight_acc)); //
27 //
28 acc(6, weight = 3); // 18
29 weight_acc(weight = 3); //
30 BOOST_CHECK_EQUAL(5, sum_of_weights(weight_acc)); //
31 //
32 acc(4, weight = 4); // 16
33 weight_acc(weight = 4); //
34 BOOST_CHECK_EQUAL(9, sum_of_weights(weight_acc)); //
35 //
36 acc(6, weight = 5); //+ 30
37 weight_acc(weight = 5); //
38 BOOST_CHECK_EQUAL(14, sum_of_weights(weight_acc)); //
39 //= 84 / 14 = 6
40
41 BOOST_CHECK_CLOSE(6., weighted_mean(acc, weights = weight_acc), 1e-5);
42}
43
44///////////////////////////////////////////////////////////////////////////////
45// init_unit_test_suite
46//
47test_suite* init_unit_test_suite( int argc, char* argv[] )
48{
49 test_suite *test = BOOST_TEST_SUITE("external_weights test");
50
51 test->add(BOOST_TEST_CASE(&test_stat));
52
53 return test;
54}
55

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