\begin{itemdescr}

\returns A \tcode{path} composed from the pathname in the generic format,

with the first \grammarterm{filename} after \grammarterm{root-path}. Otherwise, \tcode{path()}.

\end{itemdescr}

\begin{itemdescr}

otherwise a path whose generic format pathname is

the longest prefix of the generic format pathname of \tcode{*this}

that produces one fewer element in its iteration.

Otherwise, an error is reported as specified in~\ref{fs.err.report} if:

\begin{itemize}

\end{itemize}

\end{codeblock}

then:

\begin{itemize}

\item Then, iterate over the files in \tcode{from}, as if by

\begin{codeblock}

for (const directory_entry& x : directory_iterator(from))

Report a file already exists error as specified in~\ref{fs.err.report} if:

\begin{itemize}

\begin{codeblock}

(options & (copy_options::skip_existing |

copy_options::overwrite_existing |

Otherwise, copy the contents and attributes of the file \tcode{from}

resolves to, to the file \tcode{to} resolves to, if:

\begin{itemize}

\item \tcode{(options \& copy_options::overwrite_existing) != copy_options::none}, or

\item \tcode{(options \& copy_options::update_existing) \: \: != copy_options::none} and \tcode{from}

is more recent than \tcode{to}, determined as if by use of the \tcode{last_write_time} function~(\ref{fs.op.last_write_time}).

\begin{itemize}

Otherwise, if \tcode{is_regular_file(p)}, the size in bytes of the file

\tcode{p} resolves to, determined as if by the value of the POSIX \tcode{stat}

resolves to. \end{note}

\returns \tcode{false} if \tcode{p} did not exist,

resolves to. \end{note}

\returns The number of files removed. The signature with argument

\begin{itemdescr}

\returns An unspecified directory path suitable for temporary files. An error shall be reported if

The signature with argument \tcode{ec} returns \tcode{path()} if an

error occurs.