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 #ifndef BOOST_UUID_UUID_HPP_INCLUDED
 #define BOOST_UUID_UUID_HPP_INCLUDED
 
 // Copyright 2006 Andy Tompkins
 // Copyright 2024 Peter Dimov
 // Distributed under the Boost Software License, Version 1.0.
 // https://www.boost.org/LICENSE_1_0.txt
 
 #include <boost/uuid/uuid_clock.hpp>
 #include <boost/uuid/detail/endian.hpp>
 #include <boost/uuid/detail/hash_mix.hpp>
 #include <boost/uuid/detail/config.hpp>
 #include <boost/type_traits/integral_constant.hpp> // for Serialization support
 #include <boost/config.hpp>
 #include <boost/config/workaround.hpp>
 #include <array>
 #include <chrono>
 #include <typeindex> // cheapest std::hash
 #include <cstddef>
 #include <cstdint>
 #include <cstring>
 
 #if defined(__has_builtin)
 # if __has_builtin(__builtin_is_constant_evaluated)
 #  define BOOST_UUID_HAS_BUILTIN_ISCONSTEVAL
 # endif
 #endif
 
 #if !defined(BOOST_UUID_HAS_BUILTIN_ISCONSTEVAL) && defined(BOOST_MSVC) && BOOST_MSVC >= 1925
 # define BOOST_UUID_HAS_BUILTIN_ISCONSTEVAL
 #endif
 
 #if defined(__cpp_impl_three_way_comparison) && __cpp_impl_three_way_comparison >= 201907L && defined(__has_include)
 # if __has_include(<compare>)
 #  include <compare>
 #  if defined(__cpp_lib_three_way_comparison) && __cpp_lib_three_way_comparison >= 201907L
 #   define BOOST_UUID_HAS_THREE_WAY_COMPARISON __cpp_lib_three_way_comparison
 #  elif defined(_LIBCPP_VERSION)
 //  https://github.com/llvm/llvm-project/issues/73953
 #   define BOOST_UUID_HAS_THREE_WAY_COMPARISON _LIBCPP_VERSION
 #  endif
 # endif
 #endif
 
 namespace boost {
 namespace uuids {
 
 struct uuid
 {
 private:
 
     using repr_type = std::uint8_t[ 16 ];
 
     struct data_type
     {
     private:
 
         union
         {
 #if BOOST_WORKAROUND(BOOST_MSVC, < 1950)
 
             std::uint8_t repr_[ 16 ] = {};
 
 #else
 
             std::uint8_t repr_[ 16 ];
 
 #endif
 
 #if !defined(BOOST_UUID_DISABLE_ALIGNMENT)
 
             std::uint64_t align_u64_;
 
 #endif
         };
 
     public:
 
         BOOST_CXX14_CONSTEXPR operator repr_type& () noexcept { return repr_; }
         constexpr operator repr_type const& () const noexcept { return repr_; }
 
         BOOST_CXX14_CONSTEXPR std::uint8_t* operator()() noexcept { return repr_; }
         constexpr std::uint8_t const* operator()() const noexcept { return repr_; }
 
 #if BOOST_WORKAROUND(BOOST_MSVC, < 1930)
 
         BOOST_CXX14_CONSTEXPR std::uint8_t* operator+( std::ptrdiff_t i ) noexcept { return repr_ + i; }
         constexpr std::uint8_t const* operator+( std::ptrdiff_t i ) const noexcept { return repr_ + i; }
 
         BOOST_CXX14_CONSTEXPR std::uint8_t& operator[]( std::ptrdiff_t i ) noexcept { return repr_[ i ]; }
         constexpr std::uint8_t const& operator[]( std::ptrdiff_t i ) const noexcept { return repr_[ i ]; }
 
 #endif
     };
 
 public:
 
     // data
 
 #if BOOST_WORKAROUND(BOOST_MSVC, < 1950)
 
     data_type data;
 
 #else
 
     data_type data = {};
 
 #endif
 
 public:
 
     // constructors
 
     uuid() = default;
 
 #if defined(BOOST_NO_CXX14_CONSTEXPR)
 
     uuid( repr_type const& r ) noexcept
     {
         std::memcpy( data, r, 16 );
     }
 
 #elif defined(BOOST_UUID_HAS_BUILTIN_ISCONSTEVAL)
 
     constexpr uuid( repr_type const& r ) noexcept
     {
         if( __builtin_is_constant_evaluated() )
         {
             for( int i = 0; i < 16; ++i ) data[ i ] = r[ i ];
         }
         else
         {
             std::memcpy( data, r, 16 );
         }
     }
 
 #else
 
     constexpr uuid( repr_type const& r ) noexcept
     {
         for( int i = 0; i < 16; ++i ) data[ i ] = r[ i ];
     }
 
 #endif
 
     // iteration
 
     using value_type = std::uint8_t;
     using reference = std::uint8_t&;
     using const_reference = std::uint8_t const&;
     using iterator = std::uint8_t*;
     using const_iterator = std::uint8_t const*;
     using size_type = std::size_t;
     using difference_type = std::ptrdiff_t;
 
     iterator begin() noexcept { return data; }
     const_iterator begin() const noexcept { return data; }
 
     iterator end() noexcept { return data() + size(); }
     const_iterator end() const noexcept { return data() + size(); }
 
     // size
 
     constexpr size_type size() const noexcept { return static_size(); }
 
     // This does not work on some compilers
     // They seem to want the variable defined in
     // a cpp file
     //BOOST_STATIC_CONSTANT(size_type, static_size = 16);
     static constexpr size_type static_size() noexcept { return 16; }
 
     // is_nil
 
     bool is_nil() const noexcept;
 
     // variant
 
     enum variant_type
     {
         variant_ncs, // NCS backward compatibility
         variant_rfc_4122, // defined in RFC 4122 document
         variant_microsoft, // Microsoft Corporation backward compatibility
         variant_future // future definition
     };
 
     variant_type variant() const noexcept
     {
         // variant is stored in octet 7
         // which is index 8, since indexes count backwards
         unsigned char octet7 = data[8]; // octet 7 is array index 8
         if ( (octet7 & 0x80) == 0x00 ) { // 0b0xxxxxxx
             return variant_ncs;
         } else if ( (octet7 & 0xC0) == 0x80 ) { // 0b10xxxxxx
             return variant_rfc_4122;
         } else if ( (octet7 & 0xE0) == 0xC0 ) { // 0b110xxxxx
             return variant_microsoft;
         } else {
             //assert( (octet7 & 0xE0) == 0xE0 ) // 0b111xxxx
             return variant_future;
         }
     }
 
     // version
 
     enum version_type
     {
         version_unknown = -1,
         version_time_based = 1,
         version_dce_security = 2,
         version_name_based_md5 = 3,
         version_random_number_based = 4,
         version_name_based_sha1 = 5,
         version_time_based_v6 = 6,
         version_time_based_v7 = 7,
         version_custom_v8 = 8
     };
 
     version_type version() const noexcept
     {
         // version is stored in octet 9
         // which is index 6, since indexes count backwards
         std::uint8_t octet9 = data[6];
         if ( (octet9 & 0xF0) == 0x10 ) {
             return version_time_based;
         } else if ( (octet9 & 0xF0) == 0x20 ) {
             return version_dce_security;
         } else if ( (octet9 & 0xF0) == 0x30 ) {
             return version_name_based_md5;
         } else if ( (octet9 & 0xF0) == 0x40 ) {
             return version_random_number_based;
         } else if ( (octet9 & 0xF0) == 0x50 ) {
             return version_name_based_sha1;
         } else if ( (octet9 & 0xF0) == 0x60 ) {
             return version_time_based_v6;
         } else if ( (octet9 & 0xF0) == 0x70 ) {
             return version_time_based_v7;
         } else if ( (octet9 & 0xF0) == 0x80 ) {
             return version_custom_v8;
         } else {
             return version_unknown;
         }
     }
 
     // timestamp
 
     using timestamp_type = std::uint64_t;
 
     timestamp_type timestamp_v1() const noexcept
     {
         std::uint32_t time_low = detail::load_big_u32( this->data + 0 );
         std::uint16_t time_mid = detail::load_big_u16( this->data + 4 );
         std::uint16_t time_hi = detail::load_big_u16( this->data + 6 ) & 0x0FFF;
 
         return time_low | static_cast<std::uint64_t>( time_mid ) << 32 | static_cast<std::uint64_t>( time_hi ) << 48;
     }
 
     timestamp_type timestamp_v6() const noexcept
     {
         std::uint32_t time_high = detail::load_big_u32( this->data + 0 );
         std::uint16_t time_mid = detail::load_big_u16( this->data + 4 );
         std::uint16_t time_low = detail::load_big_u16( this->data + 6 ) & 0x0FFF;
 
         return time_low | static_cast<std::uint64_t>( time_mid ) << 12 | static_cast<std::uint64_t>( time_high ) << 28;
     }
 
     timestamp_type timestamp_v7() const noexcept
     {
         std::uint64_t time_and_version = detail::load_big_u64( this->data + 0 );
         return time_and_version >> 16;
     }
 
     // time_point
 
     uuid_clock::time_point time_point_v1() const noexcept
     {
         return uuid_clock::from_timestamp( timestamp_v1() );
     }
 
     uuid_clock::time_point time_point_v6() const noexcept
     {
         return uuid_clock::from_timestamp( timestamp_v6() );
     }
 
     std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds> time_point_v7() const noexcept
     {
         return std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds>( std::chrono::milliseconds( timestamp_v7() ) );
     }
 
     // clock_seq
 
     using clock_seq_type = std::uint16_t;
 
     clock_seq_type clock_seq() const noexcept
     {
         return detail::load_big_u16( this->data + 8 ) & 0x3FFF;
     }
 
     // node_identifier
 
     using node_type = std::array<std::uint8_t, 6>;
 
     node_type node_identifier() const noexcept
     {
         node_type node = {{}};
 
         std::memcpy( node.data(), this->data + 10, 6 );
         return node;
     }
 
     // swap
 
     void swap( uuid& rhs ) noexcept;
 };
 
 // operators
 
 inline bool operator==( uuid const& lhs, uuid const& rhs ) noexcept;
 inline bool operator< ( uuid const& lhs, uuid const& rhs ) noexcept;
 
 inline bool operator!=( uuid const& lhs, uuid const& rhs ) noexcept
 {
     return !(lhs == rhs);
 }
 
 inline bool operator>( uuid const& lhs, uuid const& rhs ) noexcept
 {
     return rhs < lhs;
 }
 inline bool operator<=( uuid const& lhs, uuid const& rhs ) noexcept
 {
     return !(rhs < lhs);
 }
 
 inline bool operator>=( uuid const& lhs, uuid const& rhs ) noexcept
 {
     return !(lhs < rhs);
 }
 
 #if defined(BOOST_UUID_HAS_THREE_WAY_COMPARISON)
 
 inline std::strong_ordering operator<=>( uuid const& lhs, uuid const& rhs ) noexcept;
 
 #endif
 
 // swap
 
 inline void swap( uuid& lhs, uuid& rhs ) noexcept
 {
     lhs.swap( rhs );
 }
 
 // hash_value
 
 inline std::size_t hash_value( uuid const& u ) noexcept
 {
     std::uint64_t r = 0;
 
     r = detail::hash_mix_mx( r + detail::load_little_u32( u.data +  0 ) );
     r = detail::hash_mix_mx( r + detail::load_little_u32( u.data +  4 ) );
     r = detail::hash_mix_mx( r + detail::load_little_u32( u.data +  8 ) );
     r = detail::hash_mix_mx( r + detail::load_little_u32( u.data + 12 ) );
 
     return static_cast<std::size_t>( detail::hash_mix_fmx( r ) );
 }
 
 }} //namespace boost::uuids
 
 // Boost.Serialization support
 
 // BOOST_CLASS_IMPLEMENTATION(boost::uuids::uuid, boost::serialization::primitive_type)
 
 namespace boost
 {
 namespace serialization
 {
 
 template<class T> struct implementation_level_impl;
 template<> struct implementation_level_impl<const uuids::uuid>: boost::integral_constant<int, 1> {};
 
 } // namespace serialization
 } // namespace boost
 
 // std::hash support
 
 namespace std
 {
 
 template<> struct hash<boost::uuids::uuid>
 {
     std::size_t operator()( boost::uuids::uuid const& value ) const noexcept
     {
         return boost::uuids::hash_value( value );
     }
 };
 
 } // namespace std
 
 #if defined(BOOST_UUID_USE_SSE2)
 # include <boost/uuid/detail/uuid_x86.ipp>
 #elif defined(__SIZEOF_INT128__)
 # include <boost/uuid/detail/uuid_uint128.ipp>
 #else
 # include <boost/uuid/detail/uuid_generic.ipp>
 #endif
 
 #endif // BOOST_UUID_UUID_HPP_INCLUDED

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