projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | // Copyright (C) 2003, Fernando Luis Cacciola Carballal. |
| 2 | // Copyright (C) 2014, 2015 Andrzej Krzemienski. | |
| 3 | // | |
| 4 | // Use, modification, and distribution is subject to the Boost Software | |
| 5 | // License, Version 1.0. (See 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/libs/optional for documentation. | |
| 9 | // | |
| 10 | // You are welcome to contact the author at: | |
| 11 | // fernando_cacciola@hotmail.com | |
| 12 | // | |
| 13 | #ifndef BOOST_NONE_T_17SEP2003_HPP | |
| 14 | #define BOOST_NONE_T_17SEP2003_HPP | |
| 15 | ||
| 20effc67 TL |
16 | #include <boost/config.hpp> |
| 17 | ||
| 7c673cae FG |
18 | namespace boost { |
| 19 | ||
| 20 | #ifdef BOOST_OPTIONAL_USE_OLD_DEFINITION_OF_NONE | |
| 21 | ||
| 22 | namespace detail { struct none_helper{}; } | |
| 23 | typedef int detail::none_helper::*none_t ; | |
| 24 | ||
| 25 | #elif defined BOOST_OPTIONAL_USE_SINGLETON_DEFINITION_OF_NONE | |
| 26 | ||
| 27 | class none_t {}; | |
| 28 | ||
| 29 | #else | |
| 30 | ||
| 31 | struct none_t | |
| 32 | { | |
| 33 | struct init_tag{}; | |
| 20effc67 | 34 | explicit BOOST_CONSTEXPR none_t(init_tag){} // to disable default constructor |
| 7c673cae FG |
35 | }; |
| 36 | ||
| 37 | #endif // old implementation workarounds | |
| 38 | ||
| 39 | } // namespace boost | |
| 40 | ||
| 41 | #endif // header guard |