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79 lines
1.7 KiB
79 lines
1.7 KiB
#ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED |
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#define BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED |
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// |
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// enable_shared_from_this.hpp |
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// |
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// Copyright 2002, 2009 Peter Dimov |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// See 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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// |
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// http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html |
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// |
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#include <boost/smart_ptr/weak_ptr.hpp> |
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#include <boost/smart_ptr/shared_ptr.hpp> |
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#include <boost/assert.hpp> |
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#include <boost/config.hpp> |
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namespace boost |
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{ |
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template<class T> class enable_shared_from_this |
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{ |
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protected: |
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enable_shared_from_this() |
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{ |
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} |
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enable_shared_from_this(enable_shared_from_this const &) |
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{ |
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} |
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enable_shared_from_this & operator=(enable_shared_from_this const &) |
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{ |
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return *this; |
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} |
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~enable_shared_from_this() |
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{ |
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} |
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public: |
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shared_ptr<T> shared_from_this() |
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{ |
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shared_ptr<T> p( weak_this_ ); |
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BOOST_ASSERT( p.get() == this ); |
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return p; |
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} |
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shared_ptr<T const> shared_from_this() const |
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{ |
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shared_ptr<T const> p( weak_this_ ); |
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BOOST_ASSERT( p.get() == this ); |
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return p; |
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} |
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public: // actually private, but avoids compiler template friendship issues |
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// Note: invoked automatically by shared_ptr; do not call |
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template<class X, class Y> void _internal_accept_owner( shared_ptr<X> const * ppx, Y * py ) const |
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{ |
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if( weak_this_.expired() ) |
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{ |
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weak_this_ = shared_ptr<T>( *ppx, py ); |
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} |
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} |
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private: |
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mutable weak_ptr<T> weak_this_; |
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}; |
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} // namespace boost |
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#endif // #ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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