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
110 lines
2.5 KiB
C++
110 lines
2.5 KiB
C++
/*
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* Copyright (C) 2019-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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#include "updateable_value.hh"
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#include <seastar/core/seastar.hh>
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namespace utils {
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updateable_value_base::updateable_value_base(const updateable_value_source_base& source) {
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source.add_ref(this);
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_source = &source;
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}
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updateable_value_base::~updateable_value_base() {
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if (_source) {
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_source->del_ref(this);
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}
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}
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updateable_value_base::updateable_value_base(const updateable_value_base& v) {
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if (v._source) {
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v._source->add_ref(this);
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_source = v._source;
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}
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}
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updateable_value_base&
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updateable_value_base::updateable_value_base::operator=(const updateable_value_base& v) {
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if (this != &v) {
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// If both sources are null, or non-null and equal, nothing needs to be done
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if (_source != v._source) {
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if (v._source) {
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v._source->add_ref(this);
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}
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if (_source) {
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_source->del_ref(this);
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}
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_source = v._source;
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}
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}
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return *this;
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}
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updateable_value_base::updateable_value_base(updateable_value_base&& v) noexcept
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: _source(std::exchange(v._source, nullptr)) {
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if (_source) {
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_source->update_ref(&v, this);
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}
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}
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updateable_value_base&
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updateable_value_base::operator=(updateable_value_base&& v) noexcept {
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if (this != &v) {
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if (_source) {
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_source->del_ref(this);
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}
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_source = std::exchange(v._source, nullptr);
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if (_source) {
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_source->update_ref(&v, this);
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}
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}
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return *this;
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}
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updateable_value_base&
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updateable_value_base::updateable_value_base::operator=(std::nullptr_t) {
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if (_source) {
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_source->del_ref(this);
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_source = nullptr;
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}
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return *this;
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}
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void
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updateable_value_source_base::for_each_ref(std::function<void (updateable_value_base* ref)> func) {
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for (auto ref : _refs) {
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func(ref);
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}
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}
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updateable_value_source_base::~updateable_value_source_base() {
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for (auto ref : _refs) {
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ref->_source = nullptr;
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}
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}
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void
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updateable_value_source_base::add_ref(updateable_value_base* ref) const {
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_refs.push_back(ref);
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}
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void
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updateable_value_source_base::del_ref(updateable_value_base* ref) const {
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_refs.erase(std::remove(_refs.begin(), _refs.end(), ref), _refs.end());
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}
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void
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updateable_value_source_base::update_ref(updateable_value_base* old_ref, updateable_value_base* new_ref) const {
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std::replace(_refs.begin(), _refs.end(), old_ref, new_ref);
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}
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}
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