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- // weak_from_test2.cpp
- //
- // Tests weak_from in a destructor
- //
- // Copyright 2014, 2015, 2019 Peter Dimov
- //
- // Distributed under the Boost Software License, Version 1.0.
- // http://www.boost.org/LICENSE_1_0.txt
- #include <boost/smart_ptr/enable_shared_from.hpp>
- #include <boost/weak_ptr.hpp>
- #include <boost/core/lightweight_test.hpp>
- class X: public boost::enable_shared_from
- {
- private:
- boost::weak_ptr<X> px_;
- public:
- X()
- {
- boost::weak_ptr<X> p1 = weak_from( this );
- BOOST_TEST( p1._empty() );
- BOOST_TEST( p1.expired() );
- }
- void check()
- {
- boost::weak_ptr<X> p2 = weak_from( this );
- BOOST_TEST( !p2.expired() );
- BOOST_TEST( p2.lock().get() == this );
- px_ = p2;
- }
- ~X()
- {
- boost::weak_ptr<X> p3 = weak_from( this );
- BOOST_TEST( p3.expired() );
- BOOST_TEST( !(px_ < p3) && !(p3 < px_) );
- }
- };
- int main()
- {
- {
- boost::shared_ptr< X > px( new X );
- px->check();
- }
- return boost::report_errors();
- }
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