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Section: 22.214.171.124 [fs.op.weakly.canonical] Status: WP Submitter: US Opened: 2022-11-08 Last modified: 2022-11-17
Priority: Not Prioritized
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This addresses NB comment US-60-125 (126.96.36.199 [fs.op.weakly.canonical] Avoiding normalization)
NB comment: "Implementations cannot avoid normalization because arbitrary file system changes may have occurred since any previous call. Proposed change: Remove the paragraph."
[Kona 2022-11-07; LWG review]
Discussion revolved around two different interpretations of the Remarks:
For the first interpretation, the recommendation is a bad recommendation and should be removed as suggested by the comment. For the second interpretation, we don't need to give hints to implementors about not doing unnecessary work; they already know they shouldn't do that. Either way, it should go.
[Kona 2022-11-09; Move to Immediate]
[2022-11-12 Approved at November 2022 meeting in Kona. Status changed: Immediate → WP.]
This wording is relative to N4917.
Modify 188.8.131.52 [fs.op.weakly.canonical] as indicated:
path filesystem::weakly_canonical(const path& p); path filesystem::weakly_canonical(const path& p, error_code& ec);
-1- Effects: Using status(p) or status(p, ec), respectively, to determine existence, return a path composed by operator/= from the result of calling canonical() with a path argument composed of the leading elements of p that exist, if any, followed by the elements of p that do not exist, if any. For the first form, canonical() is called without an error_code argument. For the second form, canonical() is called with ec as an error_code argument, and path() is returned at the first error occurrence, if any.
-2- Postconditions: The returned path is in normal form (184.108.40.206 [fs.path.generic]).
-3- Returns: p with symlinks resolved and the result normalized (220.127.116.11 [fs.path.generic]).
-4- Throws: As specified in 31.12.5 [fs.err.report].
-5- Remarks: Implementations should avoid unnecessary normalization such as when canonical has already been called on the entirety of p.