ClickHouse

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#include <Core/UUID.h>
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#include <Common/thread_local_rng.h>
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namespace DB
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{
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namespace UUIDHelpers
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{
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    UUID generateV4()
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    {
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        UUID uuid;
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        getHighBytes(uuid) = (thread_local_rng() & 0xffffffffffff0fffull) | 0x0000000000004000ull;
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        getLowBytes(uuid) = (thread_local_rng() & 0x3fffffffffffffffull) | 0x8000000000000000ull;
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        return uuid;
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    }
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}
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}
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