Ticket #2911: shared_from_this.hpp

// Copyright Frank Mori Hess 2009.

// 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)

#ifndef BOOST_SHARED_FROM_THIS
#define BOOST_SHARED_FROM_THIS

#include <boost/enable_shared_from_this.hpp>
#include <boost/shared_ptr.hpp>

namespace boost
{
    template<typename T>
        shared_ptr<T> shared_from_this(T *p);

    class enable_shared_from_this_base: private enable_shared_from_this<enable_shared_from_this_base>
    {
        template<typename T> friend
            boost::shared_ptr<T> shared_from_this(T *p);
        template<typename T> friend
            class boost::shared_ptr;
        friend class enable_shared_from_this<enable_shared_from_this_base>;
    };

    template<typename T>
        shared_ptr<T> shared_from_this(T *p)
    {
        return shared_ptr<T>(p->shared_from_this(), p);
    }
}

#endif // BOOST_SHARED_FROM_THIS