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- // weak_ptr_alias_test.cpp
- //
- // Copyright 2007, 2019 Peter Dimov
- //
- // Distributed under the Boost Software License, Version 1.0. (See
- // accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- #include <boost/core/lightweight_test.hpp>
- #include <boost/weak_ptr.hpp>
- #include <boost/shared_ptr.hpp>
- #include <memory>
- #include <cstddef>
- //
- class incomplete;
- struct X
- {
- int v_;
- explicit X( int v ): v_( v )
- {
- }
- ~X()
- {
- v_ = 0;
- }
- };
- template<class P1, class P2> bool share_ownership( P1 const& p1, P2 const& p2 )
- {
- return !p1.owner_before( p2 ) && !p2.owner_before( p1 );
- }
- int main()
- {
- {
- boost::shared_ptr<double> p( new double );
- float m = 0;
- boost::weak_ptr<float> p2( p, &m );
- BOOST_TEST( p2.use_count() == p.use_count() );
- BOOST_TEST( share_ownership( p, p2 ) );
- BOOST_TEST( p2.lock().get() == &m );
- {
- int m2 = 0;
- boost::weak_ptr<int> p3( p2, &m2 );
- BOOST_TEST( p3.use_count() == p2.use_count() );
- BOOST_TEST( share_ownership( p2, p3 ) );
- BOOST_TEST( p3.lock().get() == &m2 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<int const> p3( p, &m2 );
- BOOST_TEST( p3.use_count() == p.use_count() );
- BOOST_TEST( share_ownership( p, p3 ) );
- BOOST_TEST( p3.lock().get() == &m2 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<int volatile> p3( p2, &m2 );
- BOOST_TEST( p3.use_count() == p2.use_count() );
- BOOST_TEST( share_ownership( p2, p3 ) );
- BOOST_TEST( p3.lock().get() == &m2 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<void> p3( p, &m2 );
- BOOST_TEST( p3.use_count() == p.use_count() );
- BOOST_TEST( share_ownership( p, p3 ) );
- BOOST_TEST( p3.lock().get() == &m2 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<void> p3( p2, &m2 );
- BOOST_TEST( p3.use_count() == p2.use_count() );
- BOOST_TEST( share_ownership( p2, p3 ) );
- BOOST_TEST( p3.lock().get() == &m2 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<void const volatile> p3( p, &m2 );
- BOOST_TEST( p3.use_count() == p.use_count() );
- BOOST_TEST( share_ownership( p, p3 ) );
- BOOST_TEST( p3.lock().get() == &m2 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<void const volatile> p3( p2, &m2 );
- BOOST_TEST( p3.use_count() == p2.use_count() );
- BOOST_TEST( share_ownership( p2, p3 ) );
- BOOST_TEST( p3.lock().get() == &m2 );
- }
- }
- {
- boost::shared_ptr<incomplete> p;
- float m = 0;
- boost::weak_ptr<float> p2( p, &m );
- BOOST_TEST( p2.use_count() == p.use_count() );
- BOOST_TEST( share_ownership( p, p2 ) );
- {
- int m2 = 0;
- boost::weak_ptr<int> p3( p2, &m2 );
- BOOST_TEST( p3.use_count() == p2.use_count() );
- BOOST_TEST( share_ownership( p2, p3 ) );
- BOOST_TEST( p3.lock().get() == 0 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<int const> p3( p, &m2 );
- BOOST_TEST( p3.use_count() == p.use_count() );
- BOOST_TEST( share_ownership( p, p3 ) );
- BOOST_TEST( p3.lock().get() == 0 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<int volatile> p3( p2, &m2 );
- BOOST_TEST( p3.use_count() == p2.use_count() );
- BOOST_TEST( share_ownership( p2, p3 ) );
- BOOST_TEST( p3.lock().get() == 0 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<void> p3( p, &m2 );
- BOOST_TEST( p3.use_count() == p.use_count() );
- BOOST_TEST( share_ownership( p, p3 ) );
- BOOST_TEST( p3.lock().get() == 0 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<void> p3( p2, &m2 );
- BOOST_TEST( p3.use_count() == p2.use_count() );
- BOOST_TEST( share_ownership( p2, p3 ) );
- BOOST_TEST( p3.lock().get() == 0 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<void const volatile> p3( p, &m2 );
- BOOST_TEST( p3.use_count() == p.use_count() );
- BOOST_TEST( share_ownership( p, p3 ) );
- BOOST_TEST( p3.lock().get() == 0 );
- }
- {
- int m2 = 0;
- boost::weak_ptr<void const volatile> p3( p2, &m2 );
- BOOST_TEST( p3.use_count() == p2.use_count() );
- BOOST_TEST( share_ownership( p2, p3 ) );
- BOOST_TEST( p3.lock().get() == 0 );
- }
- }
- {
- boost::shared_ptr<X> p( new X( 5 ) );
- boost::weak_ptr<int const> p2( p, &p->v_ );
- BOOST_TEST( p2.use_count() == p.use_count() );
- BOOST_TEST( share_ownership( p, p2 ) );
- BOOST_TEST( p2.lock().get() == &p->v_ );
- p.reset();
- BOOST_TEST( p2.expired() );
- }
- return boost::report_errors();
- }
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