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/accumulators/accumulators.hpp>
8#include <boost/accumulators/statistics/stats.hpp>
9#include <boost/accumulators/statistics/mean.hpp>
10
11using namespace boost;
12using namespace unit_test;
13using namespace accumulators;
14
15namespace my
16{
17 BOOST_PARAMETER_KEYWORD(tag, int_ref)
18 BOOST_PARAMETER_KEYWORD(tag, sum_acc)
19}
20
21///////////////////////////////////////////////////////////////////////////////
22// test_stat
23//
24void test_stat()
25{
26 int i = 0;
27 accumulator_set<double, stats<tag::reference<int, my::tag::int_ref> > > acc(
28 my::int_ref = i);
29
30 int &ref1 = accumulators::reference<int, my::tag::int_ref>(arg1: acc);
31 int &ref2 = accumulators::reference_tag<my::tag::int_ref>(arg1: acc);
32
33 BOOST_CHECK_EQUAL(&i, &ref1);
34 BOOST_CHECK_EQUAL(&i, &ref2);
35}
36
37///////////////////////////////////////////////////////////////////////////////
38// test_external
39//
40void test_external()
41{
42 typedef accumulator_set<int, stats<tag::sum> > sum_acc_type;
43 sum_acc_type sum_acc; // the sum accumulator
44 accumulator_set<
45 int
46 , stats<
47 tag::mean
48 , tag::external<tag::sum, my::tag::sum_acc> // make sum external
49 , tag::reference<sum_acc_type, my::tag::sum_acc> // and hold a reference to it
50 >
51 > acc_with_ref(my::sum_acc = sum_acc); // initialize the reference sum
52
53 sum_acc(1);
54 sum_acc(2); // sum is now 3 for both
55
56 BOOST_CHECK_EQUAL(sum(acc_with_ref), sum(sum_acc));
57 BOOST_CHECK_EQUAL(sum(acc_with_ref), 3);
58}
59
60///////////////////////////////////////////////////////////////////////////////
61// test_external2
62//
63void test_external2()
64{
65 typedef accumulator_set<int, stats<tag::sum> > sum_acc_type;
66 sum_acc_type sum_acc; // the sum accumulator
67 accumulator_set<
68 int
69 , stats<
70 tag::mean
71 // make sum external and hold a reference to it
72 , tag::external<tag::sum, my::tag::sum_acc, sum_acc_type>
73 >
74 > acc_with_ref(my::sum_acc = sum_acc); // initialize the reference sum
75
76 sum_acc(1);
77 sum_acc(2); // sum is now 3 for both
78
79 BOOST_CHECK_EQUAL(sum(acc_with_ref), sum(sum_acc));
80 BOOST_CHECK_EQUAL(sum(acc_with_ref), 3);
81}
82
83///////////////////////////////////////////////////////////////////////////////
84// init_unit_test_suite
85//
86test_suite* init_unit_test_suite( int argc, char* argv[] )
87{
88 test_suite *test = BOOST_TEST_SUITE("reference_accumulator test");
89
90 test->add(BOOST_TEST_CASE(&test_stat));
91 test->add(BOOST_TEST_CASE(&test_external));
92 test->add(BOOST_TEST_CASE(&test_external2));
93
94 return test;
95}
96

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