ceph/src/boost/libs/smart_ptr/test/shared_ptr_reinterpret_pointer_cast_test.cpp

   1 //
   2 //  shared_pointer_reinterpret_pointer_cast_test.cpp
   3 //
   4 //  Copyright (c) 2016 Chris Glover
   5 //
   6 // Distributed under the Boost Software License, Version 1.0.
   7 // See accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt
   9 //
  10
  11 #include <boost/shared_ptr.hpp>
  12 #include <boost/detail/lightweight_test.hpp>
  13
  14 struct X
  15 {};
  16
  17 int main()
  18 {
  19     {
  20         boost::shared_ptr<char> pc;
  21
  22         boost::shared_ptr<int> pi = boost::reinterpret_pointer_cast<int>(pc);
  23         BOOST_TEST(pi.get() == 0);
  24
  25         boost::shared_ptr<X> px = boost::reinterpret_pointer_cast<X>(pc);
  26         BOOST_TEST(px.get() == 0);
  27     }
  28
  29     {
  30         boost::shared_ptr<int> pi(new int);
  31         boost::shared_ptr<char> pc = boost::reinterpret_pointer_cast<char>(pi);
  32
  33         boost::shared_ptr<int> pi2 = boost::reinterpret_pointer_cast<int>(pc);
  34         BOOST_TEST(pi.get() == pi2.get());
  35         BOOST_TEST(!(pi < pi2 || pi2 < pi));
  36         BOOST_TEST(pi.use_count() == 3);
  37         BOOST_TEST(pc.use_count() == 3);
  38         BOOST_TEST(pi2.use_count() == 3);
  39     }
  40
  41     {
  42         boost::shared_ptr<X> px(new X);
  43         boost::shared_ptr<char> pc = boost::reinterpret_pointer_cast<char>(px);
  44
  45         boost::shared_ptr<X> px2 = boost::reinterpret_pointer_cast<X>(pc);
  46         BOOST_TEST(px.get() == px2.get());
  47         BOOST_TEST(!(px < px2 || px2 < px));
  48         BOOST_TEST(px.use_count() == 3);
  49         BOOST_TEST(pc.use_count() == 3);
  50         BOOST_TEST(px2.use_count() == 3);
  51     }
  52
  53     return boost::report_errors();
  54 }
  55