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https://github.com/scylladb/scylladb.git
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a4c44cab88
Seastar recently lost support for the experimental Concepts Technical Specification (TS) and gained support for C++20 concepts. Re-enable concepts in Scylla by updating our use of concepts to the C++20 standard. This change: - peels off uses of the GCC6_CONCEPT macro - removes inclusions of <seastar/gcc6-concepts.hh> - replaces function-style concepts (no longer supported) with equation-style concepts - semicolons added and removed as needed - deprecated std::is_pod replaced by recommended replacement - updates return type constraints to use concepts instead of type names (either std::same_as or std::convertible_to, with std::same_as chosen when possible) No attempt is made to improve the concepts; this is a specification update only. Message-Id: <20200531110254.2555854-1-avi@scylladb.com>
73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
/*
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* Copyright (C) 2017 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "mutation_fragment.hh"
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#include "converting_mutation_partition_applier.hh"
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// A StreamedMutationTransformer which transforms the stream to a different schema
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class schema_upgrader {
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schema_ptr _prev;
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schema_ptr _new;
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private:
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row transform(row&& r, column_kind kind) {
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row new_row;
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r.for_each_cell([&] (column_id id, atomic_cell_or_collection& cell) {
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const column_definition& col = _prev->column_at(kind, id);
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const column_definition* new_col = _new->get_column_definition(col.name());
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if (new_col) {
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converting_mutation_partition_applier::append_cell(new_row, kind, *new_col, col, std::move(cell));
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}
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});
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return new_row;
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}
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public:
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schema_upgrader(schema_ptr s)
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: _new(std::move(s))
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{ }
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schema_ptr operator()(schema_ptr old) {
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_prev = std::move(old);
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return _new;
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}
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mutation_fragment consume(static_row&& row) {
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return mutation_fragment(static_row(transform(std::move(row.cells()), column_kind::static_column)));
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}
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mutation_fragment consume(clustering_row&& row) {
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return mutation_fragment(clustering_row(row.key(), row.tomb(), row.marker(),
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transform(std::move(row.cells()), column_kind::regular_column)));
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}
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mutation_fragment consume(range_tombstone&& rt) {
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return std::move(rt);
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}
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mutation_fragment consume(partition_start&& ph) {
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return std::move(ph);
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}
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mutation_fragment consume(partition_end&& eop) {
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return std::move(eop);
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}
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mutation_fragment operator()(mutation_fragment&& mf) {
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return std::move(mf).consume(*this);
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}
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};
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static_assert(StreamedMutationTranformer<schema_upgrader>);
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