sl@0: // Copyright (C) 2001-2003
sl@0: // Mac Murrett
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org for most recent version including documentation.
sl@0: 
sl@0: #ifndef BOOST_SINGLETON_MJM012402_HPP
sl@0: #define BOOST_SINGLETON_MJM012402_HPP
sl@0: 
sl@0: #include <boost/thread/detail/config.hpp>
sl@0: 
sl@0: namespace boost {
sl@0: namespace detail {
sl@0: namespace thread {
sl@0: 
sl@0: // class singleton has the same goal as all singletons: create one instance of
sl@0: // a class on demand, then dish it out as requested.
sl@0: 
sl@0: template <class T>
sl@0: class singleton : private T
sl@0: {
sl@0: private:
sl@0:     singleton();
sl@0:     ~singleton();
sl@0: 
sl@0: public:
sl@0:     static T &instance();
sl@0: };
sl@0: 
sl@0: 
sl@0: template <class T>
sl@0: inline singleton<T>::singleton()
sl@0: {
sl@0:     /* no-op */
sl@0: }
sl@0: 
sl@0: template <class T>
sl@0: inline singleton<T>::~singleton()
sl@0: {
sl@0:     /* no-op */
sl@0: }
sl@0: 
sl@0: template <class T>
sl@0: /*static*/ T &singleton<T>::instance()
sl@0: {
sl@0:     // function-local static to force this to work correctly at static
sl@0:     // initialization time.
sl@0:     static singleton<T> s_oT;
sl@0:     return(s_oT);
sl@0: }
sl@0: 
sl@0: } // namespace thread
sl@0: } // namespace detail
sl@0: } // namespace boost
sl@0: 
sl@0: #endif // BOOST_SINGLETON_MJM012402_HPP