From bc524d70253a4ab2fe40c3ca3e5666e267c0a4d1 Mon Sep 17 00:00:00 2001
From: Lexi Winter <lexi@le-fay.org>
Date: Sun, 29 Jun 2025 19:25:29 +0100
Subject: import catch2 3.8.1

---
 src/catch2/internal/catch_sharding.hpp | 41 ++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/catch2/internal/catch_sharding.hpp

(limited to 'src/catch2/internal/catch_sharding.hpp')

diff --git a/src/catch2/internal/catch_sharding.hpp b/src/catch2/internal/catch_sharding.hpp
new file mode 100644
index 0000000..22561f4
--- /dev/null
+++ b/src/catch2/internal/catch_sharding.hpp
@@ -0,0 +1,41 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_SHARDING_HPP_INCLUDED
+#define CATCH_SHARDING_HPP_INCLUDED
+
+#include <cassert>
+#include <cmath>
+#include <algorithm>
+
+namespace Catch {
+
+    template<typename Container>
+    Container createShard(Container const& container, std::size_t const shardCount, std::size_t const shardIndex) {
+        assert(shardCount > shardIndex);
+
+        if (shardCount == 1) {
+            return container;
+        }
+
+        const std::size_t totalTestCount = container.size();
+
+        const std::size_t shardSize = totalTestCount / shardCount;
+        const std::size_t leftoverTests = totalTestCount % shardCount;
+
+        const std::size_t startIndex = shardIndex * shardSize + (std::min)(shardIndex, leftoverTests);
+        const std::size_t endIndex = (shardIndex + 1) * shardSize + (std::min)(shardIndex + 1, leftoverTests);
+
+        auto startIterator = std::next(container.begin(), static_cast<std::ptrdiff_t>(startIndex));
+        auto endIterator = std::next(container.begin(), static_cast<std::ptrdiff_t>(endIndex));
+
+        return Container(startIterator, endIterator);
+    }
+
+}
+
+#endif // CATCH_SHARDING_HPP_INCLUDED
-- 
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