//////////////////////////////////////////////////////////////////////////////

//

// This file is the adaptation for Interprocess of boost/enable_shared_from_this.hpp

//

// (C) Copyright Peter Dimov 2002

// (C) Copyright Ion Gaztanaga 2006. 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)

//

// See http://www.boost.org/libs/interprocess for documentation.

//

//////////////////////////////////////////////////////////////////////////////



#ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED

#define BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED



#include <boost/interprocess/detail/workaround.hpp>

#include <boost/interprocess/detail/config_begin.hpp>



#include <boost/assert.hpp>

#include <boost/interprocess/smart_ptr/weak_ptr.hpp>

#include <boost/interprocess/smart_ptr/shared_ptr.hpp>



//!\file

//!Describes an utility to form a shared pointer from this



namespace boost{

namespace interprocess{



template<class T, class A, class D>

class enable_shared_from_this

{

   /// @cond

   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()

   {}

   /// @endcond



   public:

   shared_ptr<T, A, D> shared_from_this()

   {

      shared_ptr<T, A, D> p(_internal_weak_this);

      BOOST_ASSERT(detail::get_pointer(p.get()) == this);

      return p;

   }



   shared_ptr<T const, A, D> shared_from_this() const

   {

      shared_ptr<T const, A, D> p(_internal_weak_this);

      BOOST_ASSERT(detail::get_pointer(p.get()) == this);

      return p;

   }



   private:

   /// @cond

   typedef T element_type;

   mutable weak_ptr<element_type, A, D> _internal_weak_this;

   /// @endcond

};



} // namespace interprocess

} // namespace boost



#include <boost/interprocess/detail/config_end.hpp>



#endif  // #ifndef BOOST_INTERPROCESS_ENABLE_SHARED_FROM_THIS_HPP_INCLUDED



