<ranges>: Temporarily disable join_view for non-forward_ranges, pending resolution of LWG-3698
#2727
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StephanTLavavej
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May 18, 2022
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FYI here's what I think the fix would roughly look like: https://github.com/cpplearner/STL/tree/lwg3698. |
StephanTLavavej
approved these changes
May 18, 2022
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I'm speculatively mirroring this to the MSVC-internal repo - further changes can be pushed, but please notify me. |
CaseyCarter
approved these changes
May 22, 2022
StephanTLavavej
approved these changes
May 22, 2022
timsong-cpp
reviewed
May 23, 2022
…oroughly. Co-authored-by: timsong-cpp <[email protected]>
StephanTLavavej
approved these changes
May 23, 2022
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Thanks for noticing this issue and preventing users from being bitten by it! 🐍 🦇 🧛 |
fsb4000
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Aug 13, 2022
… pending resolution of LWG-3698 (microsoft#2727) Co-authored-by: Casey Carter <[email protected]> Co-authored-by: timsong-cpp <[email protected]>
cpplearner
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Feb 14, 2023
…range`s, pending resolution of LWG-3698 (microsoft#2727)" This reverts commit 2966813.
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As pointed out in LWG-3698,
join_viewis currently broken for "stashing iterators" (iterators that return a reference to a member object). The issue mentions thatjoin_viewwould need to store the outer iterator in a non-propagating-cache for input ranges.The fix might change the layout of
join_view(and of its iterator type, if we don't want to store a redundant outer iterator). So I believe that it is useful to flag the affected uses ofjoin_view.This requires users to define a macro if they don't depend on the ABI of
join_viewand want to usejoin_viewfor input ranges. I hope it's not too much of a problem.