// Copyright (C) 2001-2003

 // Mac Murrett

 //

 // 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 for most recent version including documentation.

 #ifndef BOOST_SINGLETON_MJM012402_HPP

 #define BOOST_SINGLETON_MJM012402_HPP

 #include <boost/thread/detail/config.hpp>

 namespace boost {

 namespace detail {

 namespace thread {

 // class singleton has the same goal as all singletons: create one instance of

 // a class on demand, then dish it out as requested.

 template <class T>

 class singleton : private T

 {

 private:

     singleton();

     ~singleton();

 public:

     static T &instance();

 };

 template <class T>

 inline singleton<T>::singleton()

 {

     /* no-op */

 }

 template <class T>

 inline singleton<T>::~singleton()

 {

     /* no-op */

 }

 template <class T>

 /*static*/ T &singleton<T>::instance()

 {

     // function-local static to force this to work correctly at static

     // initialization time.

     static singleton<T> s_oT;

     return(s_oT);

 }

 } // namespace thread

 } // namespace detail

 } // namespace boost

 #endif // BOOST_SINGLETON_MJM012402_HPP