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Implement LWG-4242 `ranges::distance` does not work with volatile iterators by frederick-vs-ja · Pull Request #5603 · microsoft/STL · GitHub
Implement LWG-4242
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Implement LWG-4242 ranges::distance does not work with volatile iterators
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Thanks for filing LWG-4303. This makes it a lot easier to see that the implementation is following what the Standard says, plus a proposed resolution. 😻 |
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
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Thanks for handling this highly volatile issue! 🧪 🧑🔬 💥 |
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Per LWG-4242/WG21-P3742R0 (alternative link).
Fixes #5623.
This PR makes the involved overload of
ranges::distancemore constrained than explicitly written, because the "Effects: Equivalent to:" in [range.iter.op.distance]/3 isn't changed and we should propagate the implicit constraints per [structure.specifications]/4.Drive-by change:
ranges::distanceno longer performs such a conversion.