#ifndef BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED

 #define BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED

 //

 //  enable_shared_from_this.hpp

 //

 //  Copyright (c) 2002 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 <boost/weak_ptr.hpp>

 #include <boost/shared_ptr.hpp>

 #include <boost/assert.hpp>

 #include <boost/config.hpp>

 namespace boost

 {

 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(_internal_weak_this);

         BOOST_ASSERT(p.get() == this);

         return p;

     }

     shared_ptr<T const> shared_from_this() const

     {

         shared_ptr<T const> p(_internal_weak_this);

         BOOST_ASSERT(p.get() == this);

         return p;

     }

 //  Note: No, you don't need to initialize _internal_weak_this

 //

 //  Please read the documentation, not the code

 //

 //  http://www.boost.org/libs/smart_ptr/enable_shared_from_this.html

     typedef T _internal_element_type; // for bcc 5.5.1

     mutable weak_ptr<_internal_element_type> _internal_weak_this;

 };

 } // namespace boost

 #endif  // #ifndef BOOST_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED