61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/*
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* Copyright (C) 2015-present 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 <algorithm>
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// combine two sorted uniqued sequences into a single sorted sequence
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// unique elements are copied, duplicate elements are merged with a
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// binary function.
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template <typename InputIterator1,
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typename InputIterator2,
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typename OutputIterator,
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typename Compare,
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typename Merge>
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OutputIterator
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combine(InputIterator1 begin1, InputIterator1 end1,
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InputIterator2 begin2, InputIterator2 end2,
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OutputIterator out,
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Compare compare,
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Merge merge) {
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while (begin1 != end1 && begin2 != end2) {
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auto& e1 = *begin1;
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auto& e2 = *begin2;
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if (compare(e1, e2)) {
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*out++ = e1;
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++begin1;
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} else if (compare(e2, e1)) {
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*out++ = e2;
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++begin2;
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} else {
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*out++ = merge(e1, e2);
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++begin1;
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++begin2;
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}
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}
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out = std::copy(begin1, end1, out);
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out = std::copy(begin2, end2, out);
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return out;
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}
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