405 lines
7.5 KiB
C++
405 lines
7.5 KiB
C++
#ifndef BOOST_UUID_DETAIL_ENDIAN_INCLUDED
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#define BOOST_UUID_DETAIL_ENDIAN_INCLUDED
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// Copyright 2024 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 <cstring>
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#include <cstdint>
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#if defined(_MSC_VER) && !defined(__clang__)
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# include <intrin.h>
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#endif
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namespace boost {
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namespace uuids {
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namespace detail {
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// Byte order macros
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#if defined(__BYTE_ORDER__)
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#define BOOST_UUID_BYTE_ORDER __BYTE_ORDER__
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#define BOOST_UUID_ORDER_LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
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#define BOOST_UUID_ORDER_BIG_ENDIAN __ORDER_BIG_ENDIAN__
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#elif defined(__LITTLE_ENDIAN__) || defined(_MSC_VER) || defined(__i386__) || defined(__x86_64__)
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#define BOOST_UUID_BYTE_ORDER 1234
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#define BOOST_UUID_ORDER_LITTLE_ENDIAN 1234
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#define BOOST_UUID_ORDER_BIG_ENDIAN 4321
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#elif defined(__BIG_ENDIAN__)
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#define BOOST_UUID_BYTE_ORDER 4321
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#define BOOST_UUID_ORDER_LITTLE_ENDIAN 1234
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#define BOOST_UUID_ORDER_BIG_ENDIAN 4321
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#else
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# error Unrecognized platform
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#endif
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// byteswap
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#if defined(__GNUC__) || defined(__clang__)
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inline std::uint16_t byteswap( std::uint16_t x ) noexcept
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{
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return __builtin_bswap16( x );
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}
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inline std::uint32_t byteswap( std::uint32_t x ) noexcept
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{
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return __builtin_bswap32( x );
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}
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inline std::uint64_t byteswap( std::uint64_t x ) noexcept
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{
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return __builtin_bswap64( x );
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}
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#elif defined(_MSC_VER)
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inline std::uint16_t byteswap( std::uint16_t x ) noexcept
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{
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return _byteswap_ushort( x );
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}
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inline std::uint32_t byteswap( std::uint32_t x ) noexcept
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{
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return _byteswap_ulong( x );
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}
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inline std::uint64_t byteswap( std::uint64_t x ) noexcept
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{
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return _byteswap_uint64( x );
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}
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#else
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inline std::uint16_t byteswap( std::uint16_t x ) noexcept
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{
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return static_cast<std::uint16_t>( x << 8 | x >> 8 );
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}
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inline std::uint32_t byteswap( std::uint32_t x ) noexcept
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{
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std::uint32_t step16 = x << 16 | x >> 16;
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return ((step16 << 8) & 0xff00ff00) | ((step16 >> 8) & 0x00ff00ff);
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}
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inline std::uint64_t byteswap( std::uint64_t x ) noexcept
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{
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std::uint64_t step32 = x << 32 | x >> 32;
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std::uint64_t step16 = (step32 & 0x0000FFFF0000FFFFULL) << 16 | (step32 & 0xFFFF0000FFFF0000ULL) >> 16;
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return (step16 & 0x00FF00FF00FF00FFULL) << 8 | (step16 & 0xFF00FF00FF00FF00ULL) >> 8;
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}
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#endif
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#if defined(__SIZEOF_INT128__)
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inline __uint128_t byteswap( __uint128_t x ) noexcept
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{
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return ( static_cast<__uint128_t>( detail::byteswap( static_cast<std::uint64_t>( x ) ) ) << 64 ) | detail::byteswap( static_cast<std::uint64_t>( x >> 64 ) );
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}
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#endif
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// load_*_u16
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inline std::uint16_t load_native_u16( void const* p ) noexcept
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{
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std::uint16_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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return tmp;
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}
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inline std::uint16_t load_little_u16( void const* p ) noexcept
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{
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std::uint16_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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#if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_LITTLE_ENDIAN
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return tmp;
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#else
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return detail::byteswap( tmp );
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#endif
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}
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inline std::uint16_t load_big_u16( void const* p ) noexcept
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{
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std::uint16_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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#if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_BIG_ENDIAN
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return tmp;
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#else
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return detail::byteswap( tmp );
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#endif
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}
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// load_*_u32
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inline std::uint32_t load_native_u32( void const* p ) noexcept
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{
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std::uint32_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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return tmp;
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}
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inline std::uint32_t load_little_u32( void const* p ) noexcept
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{
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std::uint32_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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#if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_LITTLE_ENDIAN
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return tmp;
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#else
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return detail::byteswap( tmp );
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#endif
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}
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inline std::uint32_t load_big_u32( void const* p ) noexcept
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{
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std::uint32_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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#if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_BIG_ENDIAN
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return tmp;
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#else
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return detail::byteswap( tmp );
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#endif
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}
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// load_*_u64
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inline std::uint64_t load_native_u64( void const* p ) noexcept
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{
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std::uint64_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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return tmp;
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}
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inline std::uint64_t load_little_u64( void const* p ) noexcept
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{
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std::uint64_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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#if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_LITTLE_ENDIAN
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return tmp;
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#else
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return detail::byteswap( tmp );
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#endif
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}
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inline std::uint64_t load_big_u64( void const* p ) noexcept
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{
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std::uint64_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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#if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_BIG_ENDIAN
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return tmp;
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#else
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return detail::byteswap( tmp );
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#endif
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}
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// load_*_u128
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#if defined(__SIZEOF_INT128__)
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inline __uint128_t load_native_u128( void const* p ) noexcept
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{
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__uint128_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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return tmp;
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}
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inline __uint128_t load_little_u128( void const* p ) noexcept
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{
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__uint128_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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#if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_LITTLE_ENDIAN
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return tmp;
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#else
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return detail::byteswap( tmp );
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#endif
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}
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inline __uint128_t load_big_u128( void const* p ) noexcept
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{
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__uint128_t tmp;
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std::memcpy( &tmp, p, sizeof( tmp ) );
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#if BOOST_UUID_BYTE_ORDER == BOOST_UUID_ORDER_BIG_ENDIAN
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return tmp;
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#else
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return detail::byteswap( tmp );
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#endif
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}
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#endif
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// store_*_u16
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inline void store_native_u16( void* p, std::uint16_t v ) noexcept
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{
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std::memcpy( p, &v, sizeof( v ) );
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}
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inline void store_little_u16( void* p, std::uint16_t v ) noexcept
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{
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#if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_LITTLE_ENDIAN
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v = detail::byteswap( v );
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#endif
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std::memcpy( p, &v, sizeof( v ) );
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}
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inline void store_big_u16( void* p, std::uint16_t v ) noexcept
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{
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#if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_BIG_ENDIAN
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v = detail::byteswap( v );
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#endif
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std::memcpy( p, &v, sizeof( v ) );
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}
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// store_*_u32
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inline void store_native_u32( void* p, std::uint32_t v ) noexcept
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{
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std::memcpy( p, &v, sizeof( v ) );
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}
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inline void store_little_u32( void* p, std::uint32_t v ) noexcept
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{
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#if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_LITTLE_ENDIAN
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v = detail::byteswap( v );
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#endif
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std::memcpy( p, &v, sizeof( v ) );
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}
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inline void store_big_u32( void* p, std::uint32_t v ) noexcept
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{
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#if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_BIG_ENDIAN
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v = detail::byteswap( v );
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#endif
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std::memcpy( p, &v, sizeof( v ) );
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}
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// store_*_u64
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inline void store_native_u64( void* p, std::uint64_t v ) noexcept
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{
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std::memcpy( p, &v, sizeof( v ) );
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}
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inline void store_little_u64( void* p, std::uint64_t v ) noexcept
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{
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#if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_LITTLE_ENDIAN
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v = detail::byteswap( v );
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#endif
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std::memcpy( p, &v, sizeof( v ) );
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}
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inline void store_big_u64( void* p, std::uint64_t v ) noexcept
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{
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#if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_BIG_ENDIAN
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v = detail::byteswap( v );
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#endif
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std::memcpy( p, &v, sizeof( v ) );
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}
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// store_*_u128
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#if defined(__SIZEOF_INT128__)
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inline void store_native_u128( void* p, __uint128_t v ) noexcept
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{
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std::memcpy( p, &v, sizeof( v ) );
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}
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inline void store_little_u128( void* p, __uint128_t v ) noexcept
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{
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#if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_LITTLE_ENDIAN
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v = detail::byteswap( v );
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#endif
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std::memcpy( p, &v, sizeof( v ) );
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}
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inline void store_big_u128( void* p, __uint128_t v ) noexcept
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{
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#if BOOST_UUID_BYTE_ORDER != BOOST_UUID_ORDER_BIG_ENDIAN
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v = detail::byteswap( v );
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#endif
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std::memcpy( p, &v, sizeof( v ) );
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}
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#endif
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} // detail
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} // uuids
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} // boost
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#endif // #ifndef BOOST_UUID_DETAIL_ENDIAN_INCLUDED
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