[libcxx] [llvm] [libc++] Implement P2442R1 `std::views::chunk` (PR #171234)

[via llvm-commits]

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+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// std::views::chunk
+
+#include <ranges>
+
+#include <algorithm>
+#include <cassert>
+#include <vector>
+
+#include "test_range.h"
+
+constexpr bool test() {
+  std::vector<int> vector = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
+
+  // Test `chunk_view.__iterator.operator<=>`
+  {
+    auto view = vector | std::views::chunk(5);
+    assert(view.begin() < view.end());
+    assert(++view.begin() < view.end());
+    assert(view.begin() + 3 == view.end());
+    assert(view.begin() + 3 > view.end() - 1);
+    assert((view.begin() <=> view.end()) == std::strong_ordering::less);
+    assert((view.begin() + 1 <=> view.end() - 2) == std::strong_ordering::equal);
+    assert((view.end() <=> view.begin()) == std::strong_ordering::greater);
+  }
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert(test());
+
+  return 0;
+}
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anonymouspc wrote:

Ok :)

https://github.com/llvm/llvm-project/pull/171234