/*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* Copyright (c) 2020 Andrey Semashev
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*/
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/*!
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* \file atomic/detail/aligned_variable.hpp
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*
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* This header defines a convenience macro for declaring aligned variables
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*/
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#ifndef BOOST_ATOMIC_DETAIL_ALIGNED_VARIABLE_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_ALIGNED_VARIABLE_HPP_INCLUDED_
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#include <boost/atomic/detail/config.hpp>
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#if defined(BOOST_ATOMIC_DETAIL_NO_CXX11_ALIGNAS)
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#include <boost/config/helper_macros.hpp>
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#include <boost/type_traits/type_with_alignment.hpp>
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#endif
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#include <boost/atomic/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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#if !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_ALIGNAS)
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#define BOOST_ATOMIC_DETAIL_ALIGNED_VAR(var_alignment, var_type, var_name) \
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alignas(var_alignment) var_type var_name
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#define BOOST_ATOMIC_DETAIL_ALIGNED_VAR_TPL(var_alignment, var_type, var_name) \
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alignas(var_alignment) var_type var_name
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#else // !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_ALIGNAS)
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// Note: Some compilers cannot use constant expressions in alignment attributes or alignas, so we have to use the union trick
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#define BOOST_ATOMIC_DETAIL_ALIGNED_VAR(var_alignment, var_type, var_name) \
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union \
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{ \
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var_type var_name; \
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boost::type_with_alignment< var_alignment >::type BOOST_JOIN(var_name, _aligner); \
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}
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#define BOOST_ATOMIC_DETAIL_ALIGNED_VAR_TPL(var_alignment, var_type, var_name) \
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union \
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{ \
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var_type var_name; \
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typename boost::type_with_alignment< var_alignment >::type BOOST_JOIN(var_name, _aligner); \
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}
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#endif // !defined(BOOST_ATOMIC_DETAIL_NO_CXX11_ALIGNAS)
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#include <boost/atomic/detail/footer.hpp>
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#endif // BOOST_ATOMIC_DETAIL_ALIGNED_VARIABLE_HPP_INCLUDED_
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