[libcxx-commits] [libcxx] [libc++][ranges] implement `std::ranges::zip_transform_view` (PR #79605)

[Louis Dionne via libcxx-commits]

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@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+//
+// 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, c++20
+
+//  constexpr decltype(auto) operator[](difference_type n) const
+//    requires random_access_range<Base>;
+
+#include <ranges>
+#include <cassert>
+
+#include "../types.h"
+
+template <class T>
+concept CanSubscript = requires(T t) { t[0]; };
+
+constexpr bool test() {
+  int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
+
+  {
+    // F returns PR value
+    std::ranges::zip_transform_view v(MakeTuple{}, SizedRandomAccessView{buffer}, std::views::iota(0));
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ldionne wrote:

Can you add more runtime testing as requested in some of the other tests?

https://github.com/llvm/llvm-project/pull/79605