[fs.dir.entry.mods]

void assign(const filesystem::path& p);
void assign(const filesystem::path& p, error_code& ec);

Effects: Equivalent to path-object = p, then refresh() or refresh(ec), respectively.

If an error occurs, the values of any cached attributes are unspecified.

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

void replace_filename(const filesystem::path& p);
void replace_filename(const filesystem::path& p, error_code& ec);

Effects: Equivalent to path-object.replace_filename(p), then refresh() or refresh(ec), respectively.

If an error occurs, the values of any cached attributes are unspecified.

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

void refresh();
void refresh(error_code& ec) noexcept;

Effects: Stores the current values of any cached attributes of the file p resolves to.

If an error occurs, an error is reported ([fs.err.report]) and the values of any cached attributes are unspecified.

[Note 1:

Implementations of directory_iterator ([fs.class.directory.iterator]) are prohibited from directly or indirectly calling the refresh function as described in [fs.class.directory.iterator.general].

— end note]

31 Input/output library [input.output]