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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/document/bucket/bucketid.h>
#include <vespa/persistence/spi/bucket_limits.h>
#include <cassert>
namespace storage {
/**
* Returns the super bucket key of the given bucket id key based on the minimum used bits allowed.
*
* For a bucket id that is explicit zero, the super bucket key is zero as well.
*/
inline uint64_t get_super_bucket_key(const document::BucketId& bucket_id) noexcept {
if (bucket_id == document::BucketId(0)) {
return 0;
}
assert(bucket_id.getUsedBits() >= spi::BucketLimits::MinUsedBits);
// Since bucket keys have count-bits at the LSB positions, we want to look at the MSBs instead.
return (bucket_id.toKey() >> (64 - spi::BucketLimits::MinUsedBits));
}
}
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