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// weak_ptr_alias_move_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 <boost/config.hpp>
#include <memory>
#include <cstddef>
#if !defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
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<float> p( new float );
boost::weak_ptr<float> p2( p );
int m2 = 0;
boost::weak_ptr<int const volatile> p3( std::move( p2 ), &m2 );
BOOST_TEST( p3.use_count() == p.use_count() );
BOOST_TEST( share_ownership( p, p3 ) );
BOOST_TEST( p3.lock().get() == &m2 );
BOOST_TEST( p2.empty() );
}
{
boost::shared_ptr<incomplete> p;
boost::weak_ptr<incomplete> p2( p );
int m2 = 0;
boost::weak_ptr<int const volatile> p3( std::move( p2 ), &m2 );
BOOST_TEST( p3.use_count() == p.use_count() );
BOOST_TEST( share_ownership( p, p3 ) );
BOOST_TEST( p3.lock().get() == 0 );
BOOST_TEST( p2.empty() );
}
{
boost::shared_ptr<X> p( new X( 5 ) );
boost::weak_ptr<X> p2( p );
boost::weak_ptr<int const volatile> p3( std::move( p2 ), &p2.lock()->v_ );
BOOST_TEST( p3.use_count() == p.use_count() );
BOOST_TEST( share_ownership( p, p3 ) );
BOOST_TEST( p3.lock().get() == &p->v_ );
BOOST_TEST( p2.empty() );
p.reset();
BOOST_TEST( p3.expired() );
}
return boost::report_errors();
}
#else // defined( BOOST_NO_CXX11_RVALUE_REFERENCES )
int main()
{
return 0;
}
#endif
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