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1 | // Copyright (C) 2001-2003 |
2 | // Mac Murrett | |
3 | // | |
4 | // Distributed under the Boost Software License, Version 1.0. (See | |
5 | // accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt) | |
7 | // | |
8 | // See http://www.boost.org for most recent version including documentation. | |
9 | ||
10 | #ifndef BOOST_SINGLETON_MJM012402_HPP | |
11 | #define BOOST_SINGLETON_MJM012402_HPP | |
12 | ||
13 | #include <boost/thread/detail/config.hpp> | |
14 | ||
15 | namespace boost { | |
16 | namespace detail { | |
17 | namespace thread { | |
18 | ||
19 | // class singleton has the same goal as all singletons: create one instance of | |
20 | // a class on demand, then dish it out as requested. | |
21 | ||
22 | template <class T> | |
23 | class singleton : private T | |
24 | { | |
25 | private: | |
26 | singleton(); | |
27 | ~singleton(); | |
28 | ||
29 | public: | |
30 | static T &instance(); | |
31 | }; | |
32 | ||
33 | ||
34 | template <class T> | |
35 | inline singleton<T>::singleton() | |
36 | { | |
37 | /* no-op */ | |
38 | } | |
39 | ||
40 | template <class T> | |
41 | inline singleton<T>::~singleton() | |
42 | { | |
43 | /* no-op */ | |
44 | } | |
45 | ||
46 | template <class T> | |
47 | /*static*/ T &singleton<T>::instance() | |
48 | { | |
49 | // function-local static to force this to work correctly at static | |
50 | // initialization time. | |
51 | static singleton<T> s_oT; | |
52 | return(s_oT); | |
53 | } | |
54 | ||
55 | } // namespace thread | |
56 | } // namespace detail | |
57 | } // namespace boost | |
58 | ||
59 | #endif // BOOST_SINGLETON_MJM012402_HPP |