ceph/src/boost/libs/algorithm/test/for_each_n_test.cpp

   1 /*
   2    Copyright (c) Marshall Clow 2013.
   3
   4    Distributed under the Boost Software License, Version 1.0. (See accompanying
   5    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7     For more information, see http://www.boost.org
   8 */
   9
  10 #include <boost/config.hpp>
  11 #include <boost/algorithm/cxx17/for_each_n.hpp>
  12
  13 #include "iterator_test.hpp"
  14
  15 #define BOOST_TEST_MAIN
  16 #include <boost/test/unit_test.hpp>
  17
  18 namespace ba = boost::algorithm;
  19
  20 struct for_each_test
  21 {
  22     for_each_test() {}
  23     static int count;
  24     void operator()(int& i) {++i; ++count;}
  25 };
  26
  27 int for_each_test::count = 0;
  28
  29 void test_for_each_n ()
  30 {
  31     typedef input_iterator<int*> Iter;
  32     int ia[] = {0, 1, 2, 3, 4, 5};
  33     const unsigned s = sizeof(ia)/sizeof(ia[0]);
  34
  35     {
  36         for_each_test::count = 0;
  37     Iter it = ba::for_each_n(Iter(ia), 0, for_each_test());
  38     BOOST_CHECK(it == Iter(ia));
  39     BOOST_CHECK(for_each_test::count == 0);
  40     }
  41
  42     {
  43         for_each_test::count = 0;
  44     Iter it = ba::for_each_n(Iter(ia), s, for_each_test());
  45
  46     BOOST_CHECK(it == Iter(ia+s));
  47     BOOST_CHECK(for_each_test::count == s);
  48     for (unsigned i = 0; i < s; ++i)
  49         BOOST_CHECK(ia[i] == static_cast<int>(i+1));
  50     }
  51
  52     {
  53         for_each_test::count = 0;
  54     Iter it = ba::for_each_n(Iter(ia), 1, for_each_test());
  55
  56     BOOST_CHECK(it == Iter(ia+1));
  57     BOOST_CHECK(for_each_test::count == 1);
  58     for (unsigned i = 0; i < 1; ++i)
  59         BOOST_CHECK(ia[i] == static_cast<int>(i+2));
  60     }
  61 }
  62
  63 BOOST_AUTO_TEST_CASE( test_main )
  64 {
  65   test_for_each_n ();
  66 }