#ifndef BOOST_SERIALIZATION_FORCE_INCLUDE_HPP

 #define BOOST_SERIALIZATION_FORCE_INCLUDE_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

 // force_include.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.

 // implementation of class export functionality.  This is an alternative to

 // "forward declaration" method to provoke instantiation of derived classes

 // that are to be serialized through pointers.

 #include <boost/config.hpp>

 // the following help macro is to guarentee that certain coded

 // is not removed by over-eager linker optimiser.  In certain cases

 // we create static objects must be created but are actually never

 // referenced - creation has a side-effect such as global registration

 // which is important to us. We make an effort to refer these objects

 // so that a smart linker won't remove them as being unreferenced.

 // In microsoft compilers, inlining the code that does the referring

 // means the code gets lost and the static object is not included

 // in the library and hence never registered.  This manifests itself

 // in an ungraceful crash at runtime when (and only when) built in

 // release mode.

 #if defined(BOOST_HAS_DECLSPEC) && !defined(__COMO__)

 #   if defined(__BORLANDC__)

 #       define BOOST_DLLEXPORT __export

 #   else

 #       define BOOST_DLLEXPORT __declspec(dllexport)

 #   endif

 #elif ! defined(_WIN32) && ! defined(_WIN64)

 #   if defined(__MWERKS__)

 #       // define BOOST_USED __attribute__ ((used))

 #   elif defined(__GNUC__) && (__GNUC__ >= 3)

 #       define BOOST_USED __attribute__ ((used))

 #   elif defined(__INTEL_COMPILER) && (BOOST_INTEL_CXX_VERSION >= 800)

 #       define BOOST_USED __attribute__ ((used))

 #   endif

 #endif

 #ifndef BOOST_USED

 #    define BOOST_USED

 #endif

 #ifndef BOOST_DLLEXPORT

 #    define BOOST_DLLEXPORT

 #endif

 #endif // BOOST_SERIALIZATION_FORCE_INCLUDE_HPP