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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>
84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
/*
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* Copyright (C) 2018 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 <concepts>
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#include "imr/alloc.hh"
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#include "imr/compound.hh"
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#include "imr/fundamental.hh"
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namespace imr {
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/// Check if a type T is a sizer for Structure.
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template<typename Structure, typename T>
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struct is_sizer_for : std::false_type { };
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template<typename Continuation, typename... Members>
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struct is_sizer_for<structure<Members...>,
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internal::structure_sizer<Continuation, Members...>>
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: std::true_type { };
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template<typename Structure, typename T>
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constexpr bool is_sizer_for_v = is_sizer_for<Structure, T>::value;
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/// Check if a type T is a serializer for Structure.
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template<typename Structure, typename T>
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struct is_serializer_for : std::false_type { };
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template<typename Continuation, typename... Members>
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struct is_serializer_for<structure<Members...>,
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internal::structure_serializer<Continuation, Members...>>
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: std::true_type { };
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template<typename Structure, typename T>
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constexpr bool is_serializer_for_v = is_serializer_for<Structure, T>::value;
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/// The default sizer for Structure.
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template<typename Structure>
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using default_sizer_t = decltype(Structure::get_sizer());
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/// The default serializer for Structure.
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template<typename Structure>
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using default_serializer_t = decltype(Structure::get_serializer(nullptr));
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/// A simple writer that accepts only sizer or serializer as an argument.
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template<typename Writer, typename Structure>
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concept WriterSimple = requires(Writer writer, default_sizer_t<Structure> sizer,
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default_serializer_t<Structure> serializer)
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{
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writer(sizer);
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writer(serializer);
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};
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/// A writer that accepts both sizer or serializer and a memory allocator.
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template<typename Writer, typename Structure>
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concept WriterAllocator = requires(Writer writer, default_sizer_t<Structure> sizer,
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default_serializer_t<Structure> serializer,
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imr::alloc::object_allocator::sizer alloc_sizer,
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imr::alloc::object_allocator::serializer alloc_serializer)
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{
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writer(sizer, alloc_sizer);
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writer(serializer, alloc_serializer);
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};
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}
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