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- #ifndef BOOSTER_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
- #define BOOSTER_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
-
- //
- // enable_shared_from_this.hpp
- //
- // Copyright 2002, 2009 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
- //
- // http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html
- //
-
- #include <booster/weak_ptr.h>
- #include <booster/shared_ptr.h>
- #include <assert.h>
- #include <booster/config.h>
-
- namespace booster
- {
-
- ///
- /// \brief This class is borrowed from boost
- ///
- /// For details see: http://www.boost.org/doc/libs/release/libs/smart_ptr
- ///
-
- template<class T> class enable_shared_from_this
- {
- protected:
-
- enable_shared_from_this()
- {
- }
-
- enable_shared_from_this(enable_shared_from_this const &)
- {
- }
-
- enable_shared_from_this & operator=(enable_shared_from_this const &)
- {
- return *this;
- }
-
- ~enable_shared_from_this()
- {
- }
-
- public:
-
- shared_ptr<T> shared_from_this()
- {
- shared_ptr<T> p( weak_this_ );
- assert( p.get() == this );
- return p;
- }
-
- shared_ptr<T const> shared_from_this() const
- {
- shared_ptr<T const> p( weak_this_ );
- assert( p.get() == this );
- return p;
- }
-
- public: // actually private, but avoids compiler template friendship issues
-
- // Note: invoked automatically by shared_ptr; do not call
- template<class X, class Y> void _internal_accept_owner( shared_ptr<X> const * ppx, Y * py ) const
- {
- if( weak_this_.expired() )
- {
- weak_this_ = shared_ptr<T>( *ppx, py );
- }
- }
-
- private:
-
- mutable weak_ptr<T> weak_this_;
- };
-
- } // namespace boost
-
- #endif // #ifndef BOOST_SMART_PTR_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED
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