libs/align/test/align_test.cpp

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