[libcxx-commits] [libcxx] [libc++][NFC] Centralize test for support of == and != in ranges (PR #78481)

[Louis Dionne via libcxx-commits]

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@@ -89,4 +91,12 @@ concept simple_view =
     std::same_as<std::ranges::iterator_t<Range>, std::ranges::iterator_t<const Range>> &&
     std::same_as<std::ranges::sentinel_t<Range>, std::ranges::sentinel_t<const Range>>;
 
+template <class T, class U = T>
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ldionne wrote:

I would remove the default template argument since `weakly_equality_comparable_with<Iterator>` is a bit confusing. I think it increases clarity if we force writing `weakly_equality_comparable_with<Iterator, Iterator>`.

https://github.com/llvm/llvm-project/pull/78481