Chris@16: // Copyright (C) 2001-2003
Chris@16: // Mac Murrett
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org for most recent version including documentation.
Chris@16: 
Chris@16: #ifndef BOOST_SINGLETON_MJM012402_HPP
Chris@16: #define BOOST_SINGLETON_MJM012402_HPP
Chris@16: 
Chris@16: #include <boost/thread/detail/config.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace detail {
Chris@16: namespace thread {
Chris@16: 
Chris@16: // class singleton has the same goal as all singletons: create one instance of
Chris@16: // a class on demand, then dish it out as requested.
Chris@16: 
Chris@16: template <class T>
Chris@16: class singleton : private T
Chris@16: {
Chris@16: private:
Chris@16:     singleton();
Chris@16:     ~singleton();
Chris@16: 
Chris@16: public:
Chris@16:     static T &instance();
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: template <class T>
Chris@16: inline singleton<T>::singleton()
Chris@16: {
Chris@16:     /* no-op */
Chris@16: }
Chris@16: 
Chris@16: template <class T>
Chris@16: inline singleton<T>::~singleton()
Chris@16: {
Chris@16:     /* no-op */
Chris@16: }
Chris@16: 
Chris@16: template <class T>
Chris@16: /*static*/ T &singleton<T>::instance()
Chris@16: {
Chris@16:     // function-local static to force this to work correctly at static
Chris@16:     // initialization time.
Chris@16:     static singleton<T> s_oT;
Chris@16:     return(s_oT);
Chris@16: }
Chris@16: 
Chris@16: } // namespace thread
Chris@16: } // namespace detail
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_SINGLETON_MJM012402_HPP