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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <cstdint>
namespace storage::bucketdb {
/**
* Iterator interface for iterating over entries in a bucket database.
* Implementations shall guarantee that iteration happens in natural key order.
*
* Key type is in the standard u64 "reversed bucket ID bits" form.
* Value type is always a (possibly wrapped) const reference to the entry itself.
*/
template <typename ConstRefT>
class ConstIterator {
public:
virtual ~ConstIterator() = default;
virtual void next() noexcept = 0;
[[nodiscard]] virtual bool valid() const noexcept = 0;
[[nodiscard]] virtual uint64_t key() const noexcept = 0;
[[nodiscard]] virtual ConstRefT value() const = 0;
};
}
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