98 lines
2.0 KiB
C++
98 lines
2.0 KiB
C++
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// weak_ptr_alias_move_test.cpp
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//
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// Copyright 2007, 2019 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/core/lightweight_test.hpp>
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#include <boost/weak_ptr.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/config.hpp>
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#include <memory>
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#include <cstddef>
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#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
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class incomplete;
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struct X
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{
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int v_;
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explicit X( int v ): v_( v )
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{
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}
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~X()
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{
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v_ = 0;
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}
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};
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template<class P1, class P2> bool share_ownership( P1 const& p1, P2 const& p2 )
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{
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return !p1.owner_before( p2 ) && !p2.owner_before( p1 );
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}
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int main()
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{
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{
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boost::shared_ptr<float> p( new float );
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boost::weak_ptr<float> p2( p );
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int m2 = 0;
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boost::weak_ptr<int const volatile> p3( std::move( p2 ), &m2 );
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BOOST_TEST( p3.use_count() == p.use_count() );
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BOOST_TEST( share_ownership( p, p3 ) );
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BOOST_TEST( p3.lock().get() == &m2 );
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BOOST_TEST( p2.empty() );
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}
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{
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boost::shared_ptr<incomplete> p;
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boost::weak_ptr<incomplete> p2( p );
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int m2 = 0;
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boost::weak_ptr<int const volatile> p3( std::move( p2 ), &m2 );
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BOOST_TEST( p3.use_count() == p.use_count() );
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BOOST_TEST( share_ownership( p, p3 ) );
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BOOST_TEST( p3.lock().get() == 0 );
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BOOST_TEST( p2.empty() );
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}
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{
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boost::shared_ptr<X> p( new X( 5 ) );
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boost::weak_ptr<X> p2( p );
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boost::weak_ptr<int const volatile> p3( std::move( p2 ), &p2.lock()->v_ );
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BOOST_TEST( p3.use_count() == p.use_count() );
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BOOST_TEST( share_ownership( p, p3 ) );
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BOOST_TEST( p3.lock().get() == &p->v_ );
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BOOST_TEST( p2.empty() );
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p.reset();
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BOOST_TEST( p3.expired() );
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}
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return boost::report_errors();
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}
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#else // defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
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int main()
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{
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return 0;
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}
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#endif
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