[libcxx-commits] [libcxx] [libc++] P3168R2 Give std::optional Range Support (PR #146491)

[Nikolas Klauser via libcxx-commits]

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@@ -566,6 +581,13 @@ using __optional_sfinae_assign_base_t _LIBCPP_NODEBUG =
 template <class _Tp>
 class optional;
 
+#    if _LIBCPP_STD_VER >= 26
+
+template <typename _Tp>
+class __optional_iterator;
+
+#    endif // _LIBCPP_STD_VER >= 26
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philnik777 wrote:

Why is this needed?

https://github.com/llvm/llvm-project/pull/146491