1 #include <boost/config.hpp>
2 
3 //
4 //  weak_from_this_test.cpp
5 //
6 //  Copyright (c) 2002, 2003, 2015 Peter Dimov
7 //
8 //  Distributed under the Boost Software License, Version 1.0.
9 //
10 //  See accompanying file LICENSE_1_0.txt or copy at
11 //  http://www.boost.org/LICENSE_1_0.txt
12 //
13 
14 
15 #include <boost/enable_shared_from_this.hpp>
16 #include <boost/shared_ptr.hpp>
17 #include <boost/weak_ptr.hpp>
18 #include <boost/detail/lightweight_test.hpp>
19 
20 class V: public boost::enable_shared_from_this<V>
21 {
22 };
23 
test()24 void test()
25 {
26     boost::shared_ptr<V> p( new V );
27 
28     boost::weak_ptr<V> q = p;
29     BOOST_TEST( !q.expired() );
30 
31     boost::weak_ptr<V> q2 = p->weak_from_this();
32     BOOST_TEST( !q2.expired() );
33     BOOST_TEST( !(q < q2) && !(q2 < q) );
34 
35     V v2( *p );
36 
37     boost::weak_ptr<V> q3 = v2.weak_from_this();
38     BOOST_TEST( q3.expired() );
39 
40     *p = V();
41 
42     boost::weak_ptr<V> q4 = p->shared_from_this();
43     BOOST_TEST( !q4.expired() );
44     BOOST_TEST( !(q < q4) && !(q4 < q) );
45     BOOST_TEST( !(q2 < q4) && !(q4 < q2) );
46 }
47 
main()48 int main()
49 {
50     test();
51     return boost::report_errors();
52 }
53