forked from boostorg/core
58 lines
1.0 KiB
C++
58 lines
1.0 KiB
C++
#ifndef BOOST_CORE_ALIGNOF_HPP_INCLUDED
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#define BOOST_CORE_ALIGNOF_HPP_INCLUDED
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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// Copyright 2023 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/config.hpp>
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#include <cstddef>
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#if !defined(BOOST_NO_CXX11_ALIGNOF)
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#define BOOST_CORE_ALIGNOF alignof
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#elif defined(__GNUC__)
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#define BOOST_CORE_ALIGNOF __alignof__
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#elif defined(_MSC_VER)
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#define BOOST_CORE_ALIGNOF __alignof
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#else
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namespace boost
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{
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namespace core
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{
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namespace detail
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{
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template<class T> struct alignof_helper
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{
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char x;
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T t;
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};
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} // namespace detail
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} // namespace core
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} // namespace boost
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#if defined(__GNUC__)
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// ignoring -Wvariadic-macros with #pragma doesn't work under GCC
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# pragma GCC system_header
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#endif
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#define BOOST_CORE_ALIGNOF(...) offsetof( ::boost::core::detail::alignof_helper<__VA_ARGS__>, t );
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#endif
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#endif // #ifndef BOOST_CORE_ALIGNOF_HPP_INCLUDED
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