29 Input/output library [input.output]

[[nodiscard]] bool empty() const noexcept;

Returns: true if the pathname in the generic format is empty, otherwise false.

bool has_root_path() const;

Returns: !root_path().empty().

bool has_root_name() const;

Returns: !root_name().empty().

bool has_root_directory() const;

Returns: !root_directory().empty().

bool has_relative_path() const;

Returns: !relative_path().empty().

bool has_parent_path() const;

Returns: !parent_path().empty().

bool has_filename() const;

Returns: !filename().empty().

bool has_stem() const;

Returns: !stem().empty().

bool has_extension() const;

Returns: !extension().empty().

bool is_absolute() const;

Returns: true if the pathname in the native format contains an absolute path ([fs.class.path]), otherwise false.

path("/").is_absolute() is true for POSIX-based operating systems, and false for Windows-based operating systems.

— end example

]

bool is_relative() const;

Returns: !is_absolute().

29.11 File systems [filesystems]