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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 "atomic_entry_ref.h"
#include <functional>
namespace vespalib::datastore {
class EntryComparator;
/**
* Class that provides a read snapshot of the dictionary.
*
* A generation guard that must be taken and held while the snapshot is considered valid.
*/
class IUniqueStoreDictionaryReadSnapshot {
public:
virtual ~IUniqueStoreDictionaryReadSnapshot() = default;
virtual void fill() = 0;
virtual void sort() = 0;
virtual size_t count(const EntryComparator& comp) const = 0;
virtual size_t count_in_range(const EntryComparator& low, const EntryComparator& high) const = 0;
virtual void foreach_key(std::function<void(const AtomicEntryRef&)> callback) const = 0;
};
}
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