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

[Yanzuo Liu via libcxx-commits]

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@@ -588,6 +723,13 @@ class _LIBCPP_DECLSPEC_EMPTY_BASES optional
 public:
   using value_type = _Tp;
 
+#    if _LIBCPP_STD_VER >= 26
+
+  using iterator       = __optional_iterator<_Tp>;
+  using const_iterator = __optional_iterator<_Tp>;
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zwuis wrote:

The reference type for `const_iterator` is `const _Tp&`.

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