30 Input/output library [input.output]

30.10 File systems [filesystems]

30.10.34 Filesystem operation functions [fs.op.funcs]

30.10.34.1 Absolute [fs.op.absolute]

path absolute(const path& p); path absolute(const path& p, error_code& ec);

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Effects: Composes an absolute path referencing the same file system location as p according to the operating system ([fs.conform.os]).

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Returns: The composed path. The signature with argument ec returns path() if an error occurs.

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[ Note: For the returned path, rp, rp.is_­absolute() is true unless an error occurs.  — end note ]

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Throws: As specified in [fs.err.report].

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[ Note: To resolve symlinks, or perform other sanitization which might require queries to secondary storage, such as hard disks, consider canonical ([fs.op.canonical]).  — end note ]

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[ Note: Implementations are strongly encouraged to not query secondary storage, and not consider !exists(p) an error.  — end note ]

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[ Example: For POSIX-based operating systems, absolute(p) is simply current_­path()/p. For Windows-based operating systems, absolute might have the same semantics as GetFullPathNameW.  — end example ]