43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
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// Copyright Catch2 Authors
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.txt or copy at
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// https://www.boost.org/LICENSE_1_0.txt)
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// SPDX-License-Identifier: BSL-1.0
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#ifndef CATCH_SHARDING_HPP_INCLUDED
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#define CATCH_SHARDING_HPP_INCLUDED
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#include <catch2/catch_session.hpp>
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#include <cmath>
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#include <algorithm>
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namespace Catch {
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template<typename Container>
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Container createShard(Container const& container, std::size_t const shardCount, std::size_t const shardIndex) {
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assert(shardCount > shardIndex);
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if (shardCount == 1) {
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return container;
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}
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const std::size_t totalTestCount = container.size();
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const std::size_t shardSize = totalTestCount / shardCount;
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const std::size_t leftoverTests = totalTestCount % shardCount;
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const std::size_t startIndex = shardIndex * shardSize + (std::min)(shardIndex, leftoverTests);
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const std::size_t endIndex = (shardIndex + 1) * shardSize + (std::min)(shardIndex + 1, leftoverTests);
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auto startIterator = std::next(container.begin(), static_cast<std::ptrdiff_t>(startIndex));
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auto endIterator = std::next(container.begin(), static_cast<std::ptrdiff_t>(endIndex));
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return Container(startIterator, endIterator);
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}
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}
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#endif // CATCH_SHARDING_HPP_INCLUDED
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