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
153 lines
6.4 KiB
C++
153 lines
6.4 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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#pragma once
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#include "dht/i_partitioner.hh"
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#include <optional>
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#include <variant>
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// Wraps ring_position_view so it is compatible with old-style C++: default
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// constructor, stateless comparators, yada yada.
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class compatible_ring_position_view {
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const ::schema* _schema = nullptr;
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// Optional to supply a default constructor, no more.
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std::optional<dht::ring_position_view> _rpv;
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public:
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constexpr compatible_ring_position_view() = default;
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compatible_ring_position_view(const schema& s, dht::ring_position_view rpv)
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: _schema(&s), _rpv(rpv) {
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}
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const dht::ring_position_view& position() const {
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return *_rpv;
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}
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const ::schema& schema() const {
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return *_schema;
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}
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friend std::strong_ordering tri_compare(const compatible_ring_position_view& x, const compatible_ring_position_view& y) {
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return dht::ring_position_tri_compare(*x._schema, *x._rpv, *y._rpv);
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}
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friend bool operator<(const compatible_ring_position_view& x, const compatible_ring_position_view& y) {
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return tri_compare(x, y) < 0;
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}
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friend bool operator<=(const compatible_ring_position_view& x, const compatible_ring_position_view& y) {
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return tri_compare(x, y) <= 0;
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}
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friend bool operator>(const compatible_ring_position_view& x, const compatible_ring_position_view& y) {
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return tri_compare(x, y) > 0;
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}
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friend bool operator>=(const compatible_ring_position_view& x, const compatible_ring_position_view& y) {
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return tri_compare(x, y) >= 0;
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}
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friend bool operator==(const compatible_ring_position_view& x, const compatible_ring_position_view& y) {
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return tri_compare(x, y) == 0;
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}
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friend bool operator!=(const compatible_ring_position_view& x, const compatible_ring_position_view& y) {
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return tri_compare(x, y) != 0;
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}
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};
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// Wraps ring_position so it is compatible with old-style C++: default
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// constructor, stateless comparators, yada yada.
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class compatible_ring_position {
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schema_ptr _schema;
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// Optional to supply a default constructor, no more.
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std::optional<dht::ring_position> _rp;
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public:
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constexpr compatible_ring_position() = default;
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compatible_ring_position(schema_ptr s, dht::ring_position rp)
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: _schema(std::move(s)), _rp(std::move(rp)) {
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}
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dht::ring_position_view position() const {
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return *_rp;
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}
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const ::schema& schema() const {
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return *_schema;
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}
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friend std::strong_ordering tri_compare(const compatible_ring_position& x, const compatible_ring_position& y) {
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return dht::ring_position_tri_compare(*x._schema, *x._rp, *y._rp);
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}
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friend bool operator<(const compatible_ring_position& x, const compatible_ring_position& y) {
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return tri_compare(x, y) < 0;
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}
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friend bool operator<=(const compatible_ring_position& x, const compatible_ring_position& y) {
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return tri_compare(x, y) <= 0;
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}
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friend bool operator>(const compatible_ring_position& x, const compatible_ring_position& y) {
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return tri_compare(x, y) > 0;
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}
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friend bool operator>=(const compatible_ring_position& x, const compatible_ring_position& y) {
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return tri_compare(x, y) >= 0;
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}
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friend bool operator==(const compatible_ring_position& x, const compatible_ring_position& y) {
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return tri_compare(x, y) == 0;
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}
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friend bool operator!=(const compatible_ring_position& x, const compatible_ring_position& y) {
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return tri_compare(x, y) != 0;
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}
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};
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// Wraps ring_position or ring_position_view so either is compatible with old-style C++: default
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// constructor, stateless comparators, yada yada.
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// The motivations for supporting both types are to make containers self-sufficient by not relying
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// on callers to keep ring position alive, allow lookup on containers that don't support different
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// key types, and also avoiding unnecessary copies.
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class compatible_ring_position_or_view {
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// Optional to supply a default constructor, no more.
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std::optional<std::variant<compatible_ring_position, compatible_ring_position_view>> _crp_or_view;
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public:
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constexpr compatible_ring_position_or_view() = default;
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explicit compatible_ring_position_or_view(schema_ptr s, dht::ring_position rp)
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: _crp_or_view(compatible_ring_position(std::move(s), std::move(rp))) {
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}
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explicit compatible_ring_position_or_view(const schema& s, dht::ring_position_view rpv)
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: _crp_or_view(compatible_ring_position_view(s, rpv)) {
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}
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dht::ring_position_view position() const {
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struct rpv_accessor {
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dht::ring_position_view operator()(const compatible_ring_position& crp) {
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return crp.position();
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}
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dht::ring_position_view operator()(const compatible_ring_position_view& crpv) {
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return crpv.position();
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}
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};
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return std::visit(rpv_accessor{}, *_crp_or_view);
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}
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friend std::strong_ordering tri_compare(const compatible_ring_position_or_view& x, const compatible_ring_position_or_view& y) {
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struct schema_accessor {
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const ::schema& operator()(const compatible_ring_position& crp) {
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return crp.schema();
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}
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const ::schema& operator()(const compatible_ring_position_view& crpv) {
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return crpv.schema();
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}
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};
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return dht::ring_position_tri_compare(std::visit(schema_accessor{}, *x._crp_or_view), x.position(), y.position());
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}
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friend bool operator<(const compatible_ring_position_or_view& x, const compatible_ring_position_or_view& y) {
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return tri_compare(x, y) < 0;
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}
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friend bool operator<=(const compatible_ring_position_or_view& x, const compatible_ring_position_or_view& y) {
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return tri_compare(x, y) <= 0;
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}
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friend bool operator>(const compatible_ring_position_or_view& x, const compatible_ring_position_or_view& y) {
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return tri_compare(x, y) > 0;
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}
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friend bool operator>=(const compatible_ring_position_or_view& x, const compatible_ring_position_or_view& y) {
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return tri_compare(x, y) >= 0;
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}
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friend bool operator==(const compatible_ring_position_or_view& x, const compatible_ring_position_or_view& y) {
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return tri_compare(x, y) == 0;
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}
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friend bool operator!=(const compatible_ring_position_or_view& x, const compatible_ring_position_or_view& y) {
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return tri_compare(x, y) != 0;
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}
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};
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