[libcxx-commits] [libcxx] [libc++] Implement a type-safe iterator for optional (PR #154239)

[Louis Dionne via libcxx-commits]

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ldionne wrote:

We should also add a libc++ specific test for the new `__upper_bounded_iterator`. You can do something similar to what we did for `__bounded_iter`: https://github.com/llvm/llvm-project/blob/main/libcxx/test/libcxx/iterators/bounded_iter

https://github.com/llvm/llvm-project/pull/154239