| // 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 |