98 lines
1.6 KiB
C++
98 lines
1.6 KiB
C++
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// weak_from_test.cpp
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//
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// Copyright 2019 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0.
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/smart_ptr/enable_shared_from.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/weak_ptr.hpp>
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#include <boost/core/lightweight_test.hpp>
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//
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class X
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{
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private:
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int m_;
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public:
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X(): m_() {}
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};
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class Y: public boost::enable_shared_from
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{
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};
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class Z: public X, public Y
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{
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public:
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boost::weak_ptr<Z> weak_from_this()
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{
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return boost::weak_from( this );
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}
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};
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void null_deleter( void const* )
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{
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}
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int main()
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{
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boost::shared_ptr<Z> sp( new Z );
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boost::weak_ptr<Z> p( sp );
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{
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boost::weak_ptr<Z> q = sp->weak_from_this();
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BOOST_TEST_EQ( p.lock(), q.lock() );
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BOOST_TEST( !( p < q ) && !( q < p ) );
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}
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Z v2( *sp );
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{
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boost::weak_ptr<Z> q = v2.weak_from_this();
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BOOST_TEST( q.expired() );
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}
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*sp = Z();
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{
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boost::weak_ptr<Z> q = sp->weak_from_this();
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BOOST_TEST_EQ( p.lock(), q.lock() );
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BOOST_TEST( !( p < q ) && !( q < p ) );
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}
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{
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boost::shared_ptr<Z> sp2( sp.get(), null_deleter );
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}
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{
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boost::weak_ptr<Z> q = sp->weak_from_this();
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BOOST_TEST_EQ( p.lock(), q.lock() );
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BOOST_TEST( !( p < q ) && !( q < p ) );
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}
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{
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boost::weak_ptr<Z> p2 = sp->weak_from_this();
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BOOST_TEST( !p.expired() );
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BOOST_TEST( !p2.expired() );
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sp.reset();
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BOOST_TEST( p.expired() );
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BOOST_TEST( p2.expired() );
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}
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return boost::report_errors();
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}
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