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48 lines
1.2 KiB
C++
48 lines
1.2 KiB
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.1
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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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std::iter_const_reference_t<InputIterator1> e1 = *begin1;
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std::iter_const_reference_t<InputIterator2> 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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