| 1 | /* |
|---|---|
| 2 | * Copyright Andrey Semashev 2007 - 2015. |
| 3 | * Distributed under the Boost Software License, Version 1.0. |
| 4 | * (See accompanying file LICENSE_1_0.txt or copy at |
| 5 | * http://www.boost.org/LICENSE_1_0.txt) |
| 6 | */ |
| 7 | /*! |
| 8 | * \file alignment_gap_between.hpp |
| 9 | * \author Andrey Semashev |
| 10 | * \date 20.11.2007 |
| 11 | * |
| 12 | * \brief This header is the Boost.Log library implementation, see the library documentation |
| 13 | * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html. |
| 14 | */ |
| 15 | |
| 16 | #ifndef BOOST_LOG_ALIGNMENT_GAP_BETWEEN_HPP_INCLUDED_ |
| 17 | #define BOOST_LOG_ALIGNMENT_GAP_BETWEEN_HPP_INCLUDED_ |
| 18 | |
| 19 | #include <boost/log/detail/config.hpp> |
| 20 | #include <boost/type_traits/alignment_of.hpp> |
| 21 | #include <boost/log/detail/header.hpp> |
| 22 | |
| 23 | namespace boost { |
| 24 | |
| 25 | BOOST_LOG_OPEN_NAMESPACE |
| 26 | |
| 27 | namespace aux { |
| 28 | |
| 29 | //! The metafunction computes the minimal gap between objects t1 and t2 of types T1 and T2 |
| 30 | //! that would be needed to maintain the alignment of t2 if it's placed right after t1 |
| 31 | template< typename T1, typename T2 > |
| 32 | struct alignment_gap_between |
| 33 | { |
| 34 | enum _ |
| 35 | { |
| 36 | T2_alignment = boost::alignment_of< T2 >::value, |
| 37 | tail_size = sizeof(T1) % T2_alignment, |
| 38 | value = tail_size > 0 ? T2_alignment - tail_size : 0 |
| 39 | }; |
| 40 | }; |
| 41 | |
| 42 | } // namespace aux |
| 43 | |
| 44 | BOOST_LOG_CLOSE_NAMESPACE // namespace log |
| 45 | |
| 46 | } // namespace boost |
| 47 | |
| 48 | #include <boost/log/detail/footer.hpp> |
| 49 | |
| 50 | #endif // BOOST_LOG_ALIGNMENT_GAP_BETWEEN_HPP_INCLUDED_ |
| 51 |