| 1 | |
|---|---|
| 2 | // shared_from_test.cpp |
| 3 | // |
| 4 | // Copyright 2019 Peter Dimov |
| 5 | // |
| 6 | // Distributed under the Boost Software License, Version 1.0. |
| 7 | // http://www.boost.org/LICENSE_1_0.txt) |
| 8 | |
| 9 | #include <boost/smart_ptr/enable_shared_from.hpp> |
| 10 | #include <boost/shared_ptr.hpp> |
| 11 | #include <boost/core/lightweight_test.hpp> |
| 12 | |
| 13 | // |
| 14 | |
| 15 | class X |
| 16 | { |
| 17 | private: |
| 18 | |
| 19 | int m_; |
| 20 | |
| 21 | public: |
| 22 | |
| 23 | X(): m_() {} |
| 24 | }; |
| 25 | |
| 26 | class Y: public boost::enable_shared_from |
| 27 | { |
| 28 | }; |
| 29 | |
| 30 | class Z: public X, public Y |
| 31 | { |
| 32 | public: |
| 33 | |
| 34 | boost::shared_ptr<Z> shared_from_this() |
| 35 | { |
| 36 | return boost::shared_from( p: this ); |
| 37 | } |
| 38 | }; |
| 39 | |
| 40 | void null_deleter( void const* ) |
| 41 | { |
| 42 | } |
| 43 | |
| 44 | int main() |
| 45 | { |
| 46 | boost::shared_ptr<Z> p( new Z ); |
| 47 | |
| 48 | try |
| 49 | { |
| 50 | boost::shared_ptr<Z> q = p->shared_from_this(); |
| 51 | |
| 52 | BOOST_TEST_EQ( p, q ); |
| 53 | BOOST_TEST( !( p < q ) && !( q < p ) ); |
| 54 | } |
| 55 | catch( boost::bad_weak_ptr const & ) |
| 56 | { |
| 57 | BOOST_ERROR( "p->shared_from_this() failed"); |
| 58 | } |
| 59 | |
| 60 | Z v2( *p ); |
| 61 | |
| 62 | try |
| 63 | { |
| 64 | boost::shared_ptr<Z> q = v2.shared_from_this(); |
| 65 | BOOST_ERROR( "v2.shared_from_this() failed to throw"); |
| 66 | } |
| 67 | catch( boost::bad_weak_ptr const & ) |
| 68 | { |
| 69 | } |
| 70 | |
| 71 | *p = Z(); |
| 72 | |
| 73 | try |
| 74 | { |
| 75 | boost::shared_ptr<Z> q = p->shared_from_this(); |
| 76 | |
| 77 | BOOST_TEST_EQ( p, q ); |
| 78 | BOOST_TEST( !( p < q ) && !( q < p ) ); |
| 79 | } |
| 80 | catch( boost::bad_weak_ptr const & ) |
| 81 | { |
| 82 | BOOST_ERROR( "p->shared_from_this() threw bad_weak_ptr after *p = Z()"); |
| 83 | } |
| 84 | |
| 85 | { |
| 86 | boost::shared_ptr<Z> p2( p.get(), null_deleter ); |
| 87 | } |
| 88 | |
| 89 | try |
| 90 | { |
| 91 | boost::shared_ptr<Z> q = p->shared_from_this(); |
| 92 | |
| 93 | BOOST_TEST_EQ( p, q ); |
| 94 | BOOST_TEST( !( p < q ) && !( q < p ) ); |
| 95 | } |
| 96 | catch( boost::bad_weak_ptr const& ) |
| 97 | { |
| 98 | BOOST_ERROR( "p->shared_from_this() failed"); |
| 99 | } |
| 100 | |
| 101 | return boost::report_errors(); |
| 102 | } |
| 103 |