[libcxx-commits] [libcxx] [libc++][ranges] P2387R3: Pipe support for user-defined range adaptors (PR #89148)

[A. Jiang via libcxx-commits]

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@@ -73,6 +81,13 @@ struct __range_adaptor_closure {
   }
 };
 
+#  if _LIBCPP_STD_VER >= 23
+namespace ranges {
+template <class _Tp>
+using range_adaptor_closure = __range_adaptor_closure<_Tp>;
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frederick-vs-ja wrote:

Can we make `range_adaptor_closure` a class template (as specified in the standard) and derived from `__range_adaptor_closure`? This is the approach of MSVC STL and seemingly working.

https://github.com/llvm/llvm-project/pull/89148