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

   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
  11 using namespace boost;
  12 using namespace unit_test;
  13 using namespace accumulators;
  14
  15 namespace my
  16 {
  17     BOOST_PARAMETER_KEYWORD(tag, int_ref)
  18     BOOST_PARAMETER_KEYWORD(tag, sum_acc)
  19 }
  20
  21 ///////////////////////////////////////////////////////////////////////////////
  22 // test_stat
  23 //
  24 void 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>(acc);
  31     int &ref2 = accumulators::reference_tag<my::tag::int_ref>(acc);
  32
  33     BOOST_CHECK_EQUAL(&i, &ref1);
  34     BOOST_CHECK_EQUAL(&i, &ref2);
  35 }
  36
  37 ///////////////////////////////////////////////////////////////////////////////
  38 // test_external
  39 //
  40 void 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 //
  63 void 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 //
  86 test_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 }