boost/core/max_align.hpp

0001 #ifndef BOOST_CORE_MAX_ALIGN_HPP_INCLUDED
0002 #define BOOST_CORE_MAX_ALIGN_HPP_INCLUDED
0003
0004 // MS compatible compilers support #pragma once
0005
0006 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
0007 # pragma once
0008 #endif
0009
0010 //  Copyright 2023 Peter Dimov
0011 //  Distributed under the Boost Software License, Version 1.0.
0012 //  https://www.boost.org/LICENSE_1_0.txt
0013
0014 #include <boost/core/alignof.hpp>
0015 #include <boost/config.hpp>
0016 #include <cstddef>
0017
0018 // BOOST_CORE_HAS_FLOAT128
0019
0020 #if defined(BOOST_HAS_FLOAT128)
0021
0022 # define BOOST_CORE_HAS_FLOAT128
0023
0024 #elif defined(__SIZEOF_FLOAT128__)
0025
0026 # define BOOST_CORE_HAS_FLOAT128
0027
0028 #elif defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 404) && defined(__i386__)
0029
0030 # define BOOST_CORE_HAS_FLOAT128
0031
0032 #endif
0033
0034 // max_align_t, max_align
0035
0036 namespace boost
0037 {
0038 namespace core
0039 {
0040
0041 union max_align_t
0042 {
0043     char c;
0044     short s;
0045     int i;
0046     long l;
0047
0048 #if !defined(BOOST_NO_LONG_LONG)
0049
0050     boost::long_long_type ll;
0051
0052 #endif
0053
0054 #if defined(BOOST_HAS_INT128)
0055
0056     boost::int128_type i128;
0057
0058 #endif
0059
0060     float f;
0061     double d;
0062     long double ld;
0063
0064 #if defined(BOOST_CORE_HAS_FLOAT128)
0065
0066     __float128 f128;
0067
0068 #endif
0069
0070     void* p;
0071     void (*pf) ();
0072
0073     int max_align_t::* pm;
0074     void (max_align_t::*pmf)();
0075 };
0076
0077 BOOST_CONSTEXPR_OR_CONST std::size_t max_align = BOOST_CORE_ALIGNOF( max_align_t );
0078
0079 } // namespace core
0080 } // namespace boost
0081
0082 #endif  // #ifndef BOOST_CORE_MAX_ALIGN_HPP_INCLUDED