[hive.erasure]/2 Have erase_if reevaluate end() LWG4318#8162
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birbacher wants to merge 1 commit intocplusplus:mainfrom
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[hive.erasure]/2 Have erase_if reevaluate end() LWG4318#8162birbacher wants to merge 1 commit intocplusplus:mainfrom
birbacher wants to merge 1 commit intocplusplus:mainfrom
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The defining code must not cache the end-iterator. In case the last element of the sequence is removed, the past-the-end iterator will be invalidated. This will trigger UB in the loop condition. Instead, re-evaluate end() each time.
Contributor
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This seems like a normative change. @jwakely? |
Contributor
Author
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At least it doesn't change the intended behaviour, I'd say. But if you reject, we'll file it as an NB comment. |
Contributor
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I don't want to make that call unilaterally, but if there's agreement from LWG that it's an obvious oversight, I'd be OK to handle it editorially. |
Member
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This seems badly normative to me, the current code is broken and avoiding repeated calls to Please just file an LWG issue, there's no reason to wait for the NB ballot. |
Member
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We have now LWG 4318 for this. |
Contributor
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Thanks, Daniel! |
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The defining code must not cache the end-iterator. In case the last element of the sequence is removed, the past-the-end iterator will be invalidated. This will trigger UB in the loop condition. Instead, re-evaluate end() each time.