29 Input/output library [input.output]

29.11 File systems [filesystems]

29.11.14 Filesystem operation functions [fs.op.funcs]

29.11.14.38 Temporary directory path [fs.op.temp.dir.path]

path temp_directory_path();
path temp_directory_path(error_code& ec);

Let p be an unspecified directory path suitable for temporary files.

Effects: If exists(p) is false or is_directory(p) is false, an error is reported ([fs.err.report]).

Returns: The path p.

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

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

[ Example

For POSIX-based operating systems, an implementation might return the path supplied by the first environment variable found in the list TMPDIR, TMP, TEMP, TEMPDIR, or if none of these are found, "/tmp".

For Windows-based operating systems, an implementation might return the path reported by the Windows GetTempPath API function.

— end example

]