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 
main()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 
56