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+#ifndef BOOST_SERIALIZATION_SINGLETON_HPP
+#define BOOST_SERIALIZATION_SINGLETON_HPP
+
+/////////1/////////2///////// 3/////////4/////////5/////////6/////////7/////////8
+//  singleton.hpp
+//
+// Copyright David Abrahams 2006. Original version
+//
+// Copyright Robert Ramey 2007.  Changes made to permit
+// application throughout the serialization library.
+//
+// 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)
+//
+// The intention here is to define a template which will convert
+// any class into a singleton with the following features:
+//
+// a) initialized before first use.
+// b) thread-safe for const access to the class
+// c) non-locking
+//
+// In order to do this,
+// a) Initialize dynamically when used.
+// b) Require that all singletons be initialized before main
+// is called or any entry point into the shared library is invoked.
+// This guarentees no race condition for initialization.
+// In debug mode, we assert that no non-const functions are called
+// after main is invoked.
+//
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif 
+
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/serialization/force_include.hpp>
+
+#ifdef BOOST_MSVC
+#  pragma warning(push)
+#  pragma warning(disable : 4511 4512)
+#endif
+
+namespace boost { 
+namespace serialization { 
+
+//////////////////////////////////////////////////////////////////////
+// Provides a dynamically-initialized (singleton) instance of T in a
+// way that avoids LNK1179 on vc6.  See http://tinyurl.com/ljdp8 or
+// http://lists.boost.org/Archives/boost/2006/05/105286.php for
+// details.
+//
+
+// singletons created by this code are guarenteed to be unique
+// within the executable or shared library which creates them.
+// This is sufficient and in fact ideal for the serialization library.
+// The singleton is created when the module is loaded and destroyed
+// when the module is unloaded.
+
+// This base class has two functions.
+
+// First it provides a module handle for each singleton indicating
+// the executable or shared library in which it was created. This
+// turns out to be necessary and sufficient to implement the tables
+// used by serialization library.
+
+// Second, it provides a mechanism to detect when a non-const function
+// is called after initialization.
+
+// make a singleton to lock/unlock all singletons for alteration.
+// The intent is that all singletons created/used by this code
+// are to be initialized before main is called. A test program
+// can lock all the singletons when main is entereed.  This any
+// attempt to retieve a mutable instances while locked will
+// generate a assertion if compiled for debug.
+
+class singleton_module : 
+    public boost::noncopyable
+{
+private:
+    static bool & get_lock(){
+        static bool lock = false;
+        return lock;
+    }
+public:
+//    static const void * get_module_handle(){
+//        return static_cast<const void *>(get_module_handle);
+//    }
+    static void lock(){
+        get_lock() = true;
+    }
+    static void unlock(){
+        get_lock() = false;
+    }
+    static bool is_locked() {
+        return get_lock();
+    }
+};
+
+namespace detail {
+
+template<class T>
+class singleton_wrapper : public T
+{
+public:
+    static bool m_is_destroyed;
+    ~singleton_wrapper(){
+        m_is_destroyed = true;
+    }
+};
+
+template<class T>
+bool detail::singleton_wrapper< T >::m_is_destroyed = false;
+
+} // detail
+
+template <class T>
+class singleton : public singleton_module
+{
+private:
+    BOOST_DLLEXPORT static T & instance;
+    // include this to provoke instantiation at pre-execution time
+    static void use(T const &) {}
+    BOOST_DLLEXPORT static T & get_instance() {
+        static detail::singleton_wrapper< T > t;
+        // refer to instance, causing it to be instantiated (and
+        // initialized at startup on working compilers)
+        BOOST_ASSERT(! detail::singleton_wrapper< T >::m_is_destroyed);
+        use(instance);
+        return static_cast<T &>(t);
+    }
+public:
+    BOOST_DLLEXPORT static T & get_mutable_instance(){
+        BOOST_ASSERT(! is_locked());
+        return get_instance();
+    }
+    BOOST_DLLEXPORT static const T & get_const_instance(){
+        return get_instance();
+    }
+    BOOST_DLLEXPORT static bool is_destroyed(){
+        return detail::singleton_wrapper< T >::m_is_destroyed;
+    }
+};
+
+template<class T>
+BOOST_DLLEXPORT T & singleton< T >::instance = singleton< T >::get_instance();
+
+} // namespace serialization
+} // namespace boost
+
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+
+#endif // BOOST_SERIALIZATION_SINGLETON_HPP