#ifndef BOOST_SERIALIZATION_TRACKING_ENUM_HPP

 #define BOOST_SERIALIZATION_TRACKING_ENUM_HPP

 // MS compatible compilers support #pragma once

 #if defined(_MSC_VER) && (_MSC_VER >= 1020)

 # pragma once

 #endif

 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8

 // tracking_enum.hpp:

 // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 

 // Use, modification and distribution is subject to 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 for updates, documentation, and revision history.

 namespace boost {

 namespace serialization {

 // addresses of serialized objects may be tracked to avoid saving/loading

 // redundant copies.  This header defines a class trait that can be used

 // to specify when objects should be tracked

 // names for each tracking level

 enum tracking_type

 {

     // never track this type

     track_never = 0,

     // track objects of this type if the object is serialized through a 

     // pointer.

     track_selectivly = 1,

     // always track this type

     track_always = 2

 };

 } // namespace serialization

 } // namespace boost

 #endif // BOOST_SERIALIZATION_TRACKING_ENUM_HPP