1 #ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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2 #define BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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5 // enable_shared_from_this.hpp
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7 // Copyright 2002, 2009 Peter Dimov
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9 // Distributed under the Boost Software License, Version 1.0.
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10 // See accompanying file LICENSE_1_0.txt or copy at
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11 // http://www.boost.org/LICENSE_1_0.txt
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13 // http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html
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16 #include <boost/smart_ptr/weak_ptr.hpp>
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17 #include <boost/smart_ptr/shared_ptr.hpp>
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18 #include <boost/assert.hpp>
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19 #include <boost/config.hpp>
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24 template<class T> class enable_shared_from_this
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28 enable_shared_from_this()
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32 enable_shared_from_this(enable_shared_from_this const &)
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36 enable_shared_from_this & operator=(enable_shared_from_this const &)
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41 ~enable_shared_from_this()
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47 shared_ptr<T> shared_from_this()
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49 shared_ptr<T> p( weak_this_ );
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50 BOOST_ASSERT( p.get() == this );
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54 shared_ptr<T const> shared_from_this() const
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56 shared_ptr<T const> p( weak_this_ );
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57 BOOST_ASSERT( p.get() == this );
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61 public: // actually private, but avoids compiler template friendship issues
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63 // Note: invoked automatically by shared_ptr; do not call
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64 template<class X, class Y> void _internal_accept_owner( shared_ptr<X> const * ppx, Y * py ) const
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66 if( weak_this_.expired() )
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68 weak_this_ = shared_ptr<T>( *ppx, py );
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74 mutable weak_ptr<T> weak_this_;
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77 } // namespace boost
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79 #endif // #ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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