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

[Louis Dionne 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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ldionne wrote:

FWIW I'm neutral on this. I don't think it hurts to have the `friend` declaration in all standard modes, but it also doesn't hurt to make it more strict and guard it. I do have some questions related to using `__wrap_iter` at all though, see below.

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