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### 3026. `filesystem::weakly_canonical` still defined in terms of `canonical(p, base)`

Section: 31.12.13.40 [fs.op.weakly.canonical] Status: C++20 Submitter: Jonathan Wakely Opened: 2017-10-14 Last modified: 2021-06-06

Priority: 0

View all other issues in [fs.op.weakly.canonical].

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Discussion:

LWG 2956 fixed `canonical` to no longer use a base path, but `weakly_canonical` should have been changed too:

> Effects: Using `status(p)` or `status(p, ec)`, respectively, to determine existence, return a path composed by `operator/=` from the result of calling `canonical()` without a `base` argument and with a […]

Since `canonical` doesn't accept a `base` argument, it doesn't make sense to talk about calling it without one.

[ 2017-10-16 Moved to Tentatively Ready after 5 positive votes on c++std-lib. ]

[2018-3-17 Adopted in Jacksonville]

Proposed resolution:

This wording is relative to N4687.

1. Change [fs.op.weakly_canonical] as indicated:

   >     path weakly_canonical(const path& p);
   >     path weakly_canonical(const path& p, error_code& ec);

   > > -1- Returns: […]

   > > -2- Effects: Using `status(p)` or `status(p, ec)`, respectively, to determine existence, return a path composed by `operator/=` from the result of calling `canonical()` without a `base` argument and 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.

   > > […]