fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
75 lines
1.4 KiB
C++
75 lines
1.4 KiB
C++
/*
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* Copyright (C) 2014-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <vector>
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#include <unordered_set>
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namespace utils {
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/**
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* This class implements an add-only vector that ensures that the elements are
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* unique.
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*
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* This class provides a similar functionality to the Java's LinkedHashSet
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* class.
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*/
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template<typename T>
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struct sequenced_set {
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typedef typename std::vector<T>::iterator iterator;
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void push_back(const T& val) {
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insert(val);
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}
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std::pair<iterator, bool> insert(const T& t) {
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auto r = _set.insert(t);
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if (r.second) {
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try {
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_vec.push_back(t);
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return std::make_pair(std::prev(_vec.end()), true);
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} catch (...) {
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_set.erase(r.first);
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throw;
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}
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}
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return std::make_pair(_vec.end(), false);
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}
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size_t size() {
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return _vec.size();
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}
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iterator begin() {
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return _vec.begin();
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}
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iterator end() {
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return _vec.end();
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}
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const std::vector<T>& get_vector() const {
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return _vec;
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}
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std::vector<T>& get_vector() {
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return _vec;
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}
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void reserve(size_t sz) {
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_set.reserve(sz);
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_vec.reserve(sz);
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}
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private:
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std::unordered_set<T> _set;
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std::vector<T> _vec;
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};
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} // namespace utils
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