ceph/src/boost/libs/align/test/align_test.cpp

   1 /*
   2 (c) 2014-2015 Glen Joseph Fernandes
   3 <glenjofe -at- gmail.com>
   4
   5 Distributed under the Boost Software
   6 License, Version 1.0.
   7 http://boost.org/LICENSE_1_0.txt
   8 */
   9 #include <boost/align/align.hpp>
  10 #include <boost/align/is_aligned.hpp>
  11 #include <boost/core/lightweight_test.hpp>
  12
  13 template<std::size_t Alignment>
  14 void test()
  15 {
  16     char s[Alignment << 1];
  17     char* b = s;
  18     while (!boost::alignment::is_aligned(b, Alignment)) {
  19         b++;
  20     }
  21     {
  22         std::size_t n = Alignment;
  23         void* p = b;
  24         void* q = boost::alignment::align(Alignment, 1, p, n);
  25         BOOST_TEST(q == p);
  26         BOOST_TEST(q == b);
  27         BOOST_TEST(boost::alignment::is_aligned(q, Alignment));
  28         BOOST_TEST(n == Alignment);
  29     }
  30     {
  31         std::size_t n = 0;
  32         void* p = b;
  33         void* q = boost::alignment::align(Alignment, 1, p, n);
  34         BOOST_TEST(q == 0);
  35         BOOST_TEST(p == b);
  36         BOOST_TEST(n == 0);
  37     }
  38     {
  39         std::size_t n = Alignment - 1;
  40         void* p = &b[1];
  41         void* q = boost::alignment::align(Alignment, 1, p, n);
  42         BOOST_TEST(q == 0);
  43         BOOST_TEST(p == &b[1]);
  44         BOOST_TEST(n == Alignment - 1);
  45     }
  46     {
  47         std::size_t n = Alignment;
  48         void* p = &b[1];
  49         void* q = boost::alignment::align(Alignment, 1, p, n);
  50         BOOST_TEST(q == p);
  51         BOOST_TEST(p == &b[Alignment]);
  52         BOOST_TEST(boost::alignment::is_aligned(q, Alignment));
  53         BOOST_TEST(n == 1);
  54     }
  55 }
  56
  57 int main()
  58 {
  59     test<1>();
  60     test<2>();
  61     test<4>();
  62     test<8>();
  63     test<16>();
  64     test<32>();
  65     test<64>();
  66     test<128>();
  67
  68     return boost::report_errors();
  69 }