ceph/src/boost/libs/accumulators/test/sum_kahan.cpp

   1 //  (C) Copyright Gaetano Mendola 2010, 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/sum_kahan.hpp>
  10 #include <boost/accumulators/statistics/variates/covariate.hpp>
  11
  12 using namespace boost;
  13 using namespace unit_test;
  14 using namespace accumulators;
  15
  16 ///////////////////////////////////////////////////////////////////////////////
  17 // test_sum_kahan
  18 //
  19 void test_sum_kahan()
  20 {
  21     accumulator_set<float, stats<tag::sum_kahan> > acc;
  22
  23     BOOST_CHECK_EQUAL(0.0f, sum_kahan(acc));
  24
  25     for (size_t i = 0; i < 1e6; ++i) {
  26         acc(1e-6f);
  27     }
  28
  29     BOOST_CHECK_EQUAL(1.0f, sum_kahan(acc));
  30 }
  31
  32 ///////////////////////////////////////////////////////////////////////////////
  33 // test_sum_of_weights_kahan
  34 //
  35 void test_sum_of_weights_kahan()
  36 {
  37     accumulator_set<float, stats<tag::sum_of_weights_kahan>, float > acc;
  38
  39     BOOST_CHECK_EQUAL(0.0f, sum_of_weights_kahan(acc));
  40
  41     for (size_t i = 0; i < 1e6; ++i) {
  42         acc(0, weight = 1e-6f);
  43     }
  44
  45     BOOST_CHECK_EQUAL(1.0f, sum_of_weights_kahan(acc));
  46 }
  47
  48 ///////////////////////////////////////////////////////////////////////////////
  49 // test_sum_of_variates_kahan
  50 //
  51 void test_sum_of_variates_kahan()
  52 {
  53     accumulator_set<
  54         float,
  55         stats<tag::sum_of_variates_kahan<float, tag::covariate1> >,
  56         float
  57     >
  58     acc;
  59
  60     BOOST_CHECK_EQUAL(0.0f, sum_of_variates_kahan(acc));
  61
  62     for (size_t i = 0; i < 1e6; ++i) {
  63         acc(0, covariate1 = 1e-6f);
  64     }
  65
  66     BOOST_CHECK_EQUAL(1.0f, sum_of_variates_kahan(acc));
  67 }
  68
  69 ///////////////////////////////////////////////////////////////////////////////
  70 // init_unit_test_suite
  71 //
  72 test_suite* init_unit_test_suite( int argc, char* argv[] )
  73 {
  74     test_suite *test = BOOST_TEST_SUITE("sum kahan tests");
  75
  76     test->add(BOOST_TEST_CASE(&test_sum_kahan));
  77     test->add(BOOST_TEST_CASE(&test_sum_of_weights_kahan));
  78     test->add(BOOST_TEST_CASE(&test_sum_of_variates_kahan));
  79
  80     return test;
  81 }