31 Input/output library [input.output]

31.12 File systems [filesystems]

31.12.13 Filesystem operation functions [fs.op.funcs]

31.12.13.3 Canonical [fs.op.canonical]

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path filesystem::canonical(const path& p); path filesystem::canonical(const path& p, error_code& ec);
1
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Effects: Converts p to an absolute path that has no symbolic link, dot, or dot-dot elements in its pathname in the generic format.
2
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Returns: A path that refers to the same file system object as absolute(p).
The signature with argument ec returns path() if an error occurs.
3
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Throws: As specified in [fs.err.report].
4
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Remarks: !exists(p) is an error.