7215d4bfe9
these unused includes were identifier by clang-include-cleaner. after auditing these source files, all of the reports have been confirmed. please note, because quite a few source files relied on `utils/to_string.hh` to pull in the specialization of `fmt::formatter<std::optional<T>>`, after removing `#include <fmt/std.h>` from `utils/to_string.hh`, we have to include `fmt/std.h` directly. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*
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* Modified by ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: (LicenseRef-ScyllaDB-Source-Available-1.0 and Apache-2.0)
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*/
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#pragma once
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#include <memory>
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#include "bytes_fwd.hh"
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namespace utils {
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struct i_filter;
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using filter_ptr = std::unique_ptr<i_filter>;
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enum class filter_format {
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k_l_format,
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m_format,
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};
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class hashed_key {
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private:
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std::array<uint64_t, 2> _hash;
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public:
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hashed_key(std::array<uint64_t, 2> h) : _hash(h) {}
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std::array<uint64_t, 2> hash() const { return _hash; };
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};
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hashed_key make_hashed_key(bytes_view key);
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// FIXME: serialize() and serialized_size() not implemented. We should only be serializing to
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// disk, not in the wire.
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struct i_filter {
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virtual ~i_filter() {}
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virtual void add(const bytes_view& key) = 0;
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virtual bool is_present(const bytes_view& key) = 0;
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virtual bool is_present(hashed_key) = 0;
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virtual void clear() = 0;
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virtual void close() = 0;
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virtual size_t memory_size() = 0;
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/**
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* @return The smallest bloom_filter that can provide the given false
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* positive probability rate for the given number of elements.
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*
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* Asserts that the given probability can be satisfied using this
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* filter.
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*/
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static filter_ptr get_filter(int64_t num_elements, double max_false_pos_prob, filter_format format);
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/**
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* @return the size of the smallest filter (in bytes), according to the conditions described at get_filter()
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*/
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static size_t get_filter_size(int64_t num_elements, double max_false_pos_prob);
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};
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}
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