| /* |
| * 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) |
| * |
| * Copyright (c) 2020 Andrey Semashev |
| */ |
| /*! |
| * \file atomic/detail/aligned_variable.hpp |
| * |
| * This header defines a convenience macro for declaring aligned variables |
| */ |
| |
| #ifndef BOOST_ATOMIC_DETAIL_ALIGNED_VARIABLE_HPP_INCLUDED_ |
| #define BOOST_ATOMIC_DETAIL_ALIGNED_VARIABLE_HPP_INCLUDED_ |
| |
| #include <boost/atomic/detail/config.hpp> |
| #if defined(BOOST_ATOMIC_DETAIL_NO_CXX11_ALIGNAS) |
| #include <boost/config/helper_macros.hpp> |
| #include <boost/type_traits/type_with_alignment.hpp> |
| #endif |
| #include <boost/atomic/detail/header.hpp> |
| |
| #ifdef BOOST_HAS_PRAGMA_ONCE |
| #pragma once |
| #endif |
| |
| #if !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_ALIGNAS) |
| |
| #define BOOST_ATOMIC_DETAIL_ALIGNED_VAR(var_alignment, var_type, var_name) \ |
| alignas(var_alignment) var_type var_name |
| |
| #define BOOST_ATOMIC_DETAIL_ALIGNED_VAR_TPL(var_alignment, var_type, var_name) \ |
| alignas(var_alignment) var_type var_name |
| |
| #else // !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_ALIGNAS) |
| |
| // Note: Some compilers cannot use constant expressions in alignment attributes or alignas, so we have to use the union trick |
| #define BOOST_ATOMIC_DETAIL_ALIGNED_VAR(var_alignment, var_type, var_name) \ |
| union \ |
| { \ |
| var_type var_name; \ |
| boost::type_with_alignment< var_alignment >::type BOOST_JOIN(var_name, _aligner); \ |
| } |
| |
| #define BOOST_ATOMIC_DETAIL_ALIGNED_VAR_TPL(var_alignment, var_type, var_name) \ |
| union \ |
| { \ |
| var_type var_name; \ |
| typename boost::type_with_alignment< var_alignment >::type BOOST_JOIN(var_name, _aligner); \ |
| } |
| |
| #endif // !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_ALIGNAS) |
| |
| #include <boost/atomic/detail/footer.hpp> |
| |
| #endif // BOOST_ATOMIC_DETAIL_ALIGNED_VARIABLE_HPP_INCLUDED_ |