multiprecision/detail/endian.hpp

0001 ////////////////////////////////////////////////////////////////
0002 //  Copyright 2021 Matt Borland. Distributed under the Boost
0003 //  Software License, Version 1.0. (See accompanying file
0004 //  LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
0005
0006 #ifndef BOOST_MP_DETAIL_ENDIAN_HPP
0007 #define BOOST_MP_DETAIL_ENDIAN_HPP
0008
0009 #include <boost/multiprecision/detail/standalone_config.hpp>
0010
0011 #ifndef BOOST_MP_STANDALONE
0012
0013 #  include <boost/predef/other/endian.h>
0014 #  define BOOST_MP_ENDIAN_BIG_BYTE BOOST_ENDIAN_BIG_BYTE
0015 #  define BOOST_MP_ENDIAN_LITTLE_BYTE BOOST_ENDIAN_LITTLE_BYTE
0016
0017 #elif defined(_WIN32)
0018
0019 #  define BOOST_MP_ENDIAN_BIG_BYTE 0
0020 #  define BOOST_MP_ENDIAN_LITTLE_BYTE 1
0021
0022 #elif defined(__BYTE_ORDER__)
0023
0024 #  define BOOST_MP_ENDIAN_BIG_BYTE (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
0025 #  define BOOST_MP_ENDIAN_LITTLE_BYTE (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
0026
0027 #else
0028 #  error Could not determine endian type. Please disable standalone mode, and file an issue at https://github.com/boostorg/multiprecision
0029 #endif // Determine endianness
0030
0031 static_assert((BOOST_MP_ENDIAN_BIG_BYTE || BOOST_MP_ENDIAN_LITTLE_BYTE)
0032     && !(BOOST_MP_ENDIAN_BIG_BYTE && BOOST_MP_ENDIAN_LITTLE_BYTE),
0033     "Inconsistent endianness detected. Please disable standalone mode, and file an issue at https://github.com/boostorg/multiprecision");
0034
0035 #endif // BOOST_MP_DETAIL_ENDIAN_HPP