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

[Nikolas Klauser via libcxx-commits]

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@@ -578,6 +600,120 @@ struct __is_std_optional : false_type {};
 template <class _Tp>
 struct __is_std_optional<optional<_Tp>> : true_type {};
 
+#    if _LIBCPP_STD_VER >= 26
+
+template <class _T>
+constexpr bool ranges::enable_view<optional<_T>> = true;
+
+template <class _T>
+constexpr auto format_kind<optional<_T>> = range_format::disabled;
+
+template <typename _Tp>
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philnik777 wrote:

Please add tests to make sure that the iterator fulfills all the iterator requirements. 

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