[libcxx-commits] [libcxx] [libc++] P2770R0: "Stashing stashing iterators for proper flattening" (PR #66033)

[Louis Dionne via libcxx-commits]

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@@ -154,11 +163,10 @@ namespace ranges {
     requires view<_View> && input_range<range_reference_t<_View>>
   template<bool _Const>
   struct join_view<_View>::__sentinel {
-  template<bool>
-    friend struct __sentinel;
-
   private:
-    using _Parent = __maybe_const<_Const, join_view<_View>>;
+    friend join_view;
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ldionne wrote:

Why is this friend needed?

https://github.com/llvm/llvm-project/pull/66033