[libcxx-commits] [libcxx] [libc++] Implement P3168R2: Give optional range support (PR #149441)

[A. Jiang via libcxx-commits]

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@@ -117,6 +117,8 @@ class __wrap_iter {
   friend class span;
   template <class _Tp, size_t _Size>
   friend struct array;
+  template <class _Tp>
+  friend class optional;
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frederick-vs-ja wrote:

I think we should guard this declaration with `_LIBCPP_STD_VER >= 26` (or at least `_LIBCPP_STD_VER >= 17`). Although the declaration of `span` wasn't guarded previously.

https://github.com/llvm/llvm-project/pull/149441