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d216c3dbd2
This patch extracts out the relational operators in struct tombstone to a class capable of generating them from a tri-compare function. Signed-off-by: Duarte Nunes <duarte@scylladb.com>
68 lines
1.7 KiB
C++
68 lines
1.7 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 <seastar/util/gcc6-concepts.hh>
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#include <type_traits>
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GCC6_CONCEPT(
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template<typename T>
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concept bool HasTriCompare =
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requires(const T& t) {
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{ t.compare(t) } -> int;
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} && std::is_same<std::result_of_t<decltype(&T::compare)(T, T)>, int>::value; //FIXME: #1449
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)
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template<typename T>
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class with_relational_operators {
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private:
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template<typename U>
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GCC6_CONCEPT( requires HasTriCompare<U> )
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int do_compare(const U& t) const {
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return static_cast<const U*>(this)->compare(t);
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}
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public:
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bool operator<(const T& t) const {
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return do_compare(t) < 0;
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}
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bool operator<=(const T& t) const {
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return do_compare(t) <= 0;
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}
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bool operator>(const T& t) const {
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return do_compare(t) > 0;
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}
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bool operator>=(const T& t) const {
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return do_compare(t) >= 0;
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}
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bool operator==(const T& t) const {
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return do_compare(t) == 0;
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}
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bool operator!=(const T& t) const {
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return do_compare(t) != 0;
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}
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};
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