408aa289fe
As requested in #22114, moved the files and fixed other includes and build system. Moved files: - interval.hh - Map_difference.hh Fixes: #22114 This is a cleanup, no need to backport Closes scylladb/scylladb#25095
74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include <set>
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template<typename Key>
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struct map_difference {
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// Entries in left map whose keys don't exist in the right map.
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std::set<Key> entries_only_on_left;
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// Entries in right map whose keys don't exist in the left map.
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std::set<Key> entries_only_on_right;
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// Entries that appear in both maps with the same value.
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std::set<Key> entries_in_common;
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// Entries that appear in both maps but have different values.
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std::set<Key> entries_differing;
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map_difference()
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: entries_only_on_left{}
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, entries_only_on_right{}
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, entries_in_common{}
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, entries_differing{}
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{ }
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};
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/**
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* Produces a map_difference between the two specified maps, with Key keys and
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* Tp values, using the provided equality function. In order to work with any
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* map type, such as std::map and std::unordered_map, Args holds the remaining
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* type parameters of the particular map type.
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*/
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template<template<typename...> class Map,
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typename Key,
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typename Tp,
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typename Eq = std::equal_to<Tp>,
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typename... Args>
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inline
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map_difference<Key>
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difference(const Map<Key, Tp, Args...>& left,
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const Map<Key, Tp, Args...>& right,
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Eq equals = Eq())
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{
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map_difference<Key> diff{};
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for (auto&& kv : right) {
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diff.entries_only_on_right.emplace(kv.first);
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}
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for (auto&& kv : left) {
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auto&& left_key = kv.first;
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auto&& it = right.find(left_key);
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if (it != right.end()) {
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diff.entries_only_on_right.erase(left_key);
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const Tp& left_value = kv.second;
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const Tp& right_value = it->second;
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if (equals(left_value, right_value)) {
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diff.entries_in_common.emplace(left_key);
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} else {
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diff.entries_differing.emplace(left_key);
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}
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} else {
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diff.entries_only_on_left.emplace(left_key);
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}
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}
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return diff;
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}
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