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c83cf1f965
A follow up for the patch for #7611. This change was requested during review and moved out of #7611 to reduce its scope. The patch switches UUID_gen API from using plain integers to hold time units to units from std::chrono. For one, we plan to switch the entire code base to std::chrono units, to ensure type safety. Secondly, using std::chrono units allows to increase code reuse with template metaprogramming and remove a few of UUID_gen functions that beceme redundant as a result. * switch get_time_UUID(), unix_timestamp(), get_time_UUID_raw(), switch min_time_UUID(), max_time_UUID(), create_time_safe() to std::chrono * remove unused variant of from_unix_timestamp() * remove unused get_time_UUID_bytes(), create_time_unsafe(), redundant get_adjusted_timestamp() * inline get_raw_UUID_bytes() * collapse to similar implementations of get_time_UUID() * switch internal constants to std::chrono * remove unnecessary unique_ptr from UUID_gen::_instance Message-Id: <20210406130152.3237914-2-kostja@scylladb.com>