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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>
85 lines
3.2 KiB
C++
85 lines
3.2 KiB
C++
/*
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* Copyright (C) 2015 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 "database_fwd.hh"
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#include "mutation_partition_visitor.hh"
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#include "utils/input_stream.hh"
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namespace ser {
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class mutation_partition_view;
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}
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class partition_builder;
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class converting_mutation_partition_applier;
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template<typename T>
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concept MutationViewVisitor = requires (T& visitor, tombstone t, atomic_cell ac,
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collection_mutation_view cmv, range_tombstone rt,
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position_in_partition_view pipv, row_tombstone row_tomb,
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row_marker rm) {
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visitor.accept_partition_tombstone(t);
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visitor.accept_static_cell(column_id(), std::move(ac));
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visitor.accept_static_cell(column_id(), cmv);
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visitor.accept_row_tombstone(rt);
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visitor.accept_row(pipv, row_tomb, rm,
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is_dummy::no, is_continuous::yes);
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visitor.accept_row_cell(column_id(), std::move(ac));
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visitor.accept_row_cell(column_id(), cmv);
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};
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class mutation_partition_view_virtual_visitor {
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public:
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virtual ~mutation_partition_view_virtual_visitor();
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virtual void accept_partition_tombstone(tombstone t) = 0;
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virtual void accept_static_cell(column_id, atomic_cell ac) = 0;
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virtual void accept_static_cell(column_id, collection_mutation_view cmv) = 0;
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virtual void accept_row_tombstone(range_tombstone rt) = 0;
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virtual void accept_row(position_in_partition_view pipv, row_tombstone rt, row_marker rm, is_dummy, is_continuous) = 0;
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virtual void accept_row_cell(column_id, atomic_cell ac) = 0;
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virtual void accept_row_cell(column_id, collection_mutation_view cmv) = 0;
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};
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// View on serialized mutation partition. See mutation_partition_serializer.
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class mutation_partition_view {
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utils::input_stream _in;
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private:
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mutation_partition_view(utils::input_stream v)
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: _in(v)
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{ }
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template<typename Visitor>
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requires MutationViewVisitor<Visitor>
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void do_accept(const column_mapping&, Visitor& visitor) const;
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public:
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static mutation_partition_view from_stream(utils::input_stream v) {
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return { v };
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}
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static mutation_partition_view from_view(ser::mutation_partition_view v);
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void accept(const schema& schema, partition_builder& visitor) const;
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void accept(const column_mapping&, converting_mutation_partition_applier& visitor) const;
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void accept(const column_mapping&, mutation_partition_view_virtual_visitor& mpvvv) const;
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std::optional<clustering_key> first_row_key() const;
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std::optional<clustering_key> last_row_key() const;
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};
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