bool exists(file_status s) noexcept;
Returns: status_known(s) && s.type() != file_type::not_found. bool exists(const path& p);
bool exists(const path& p, error_code& ec) noexcept;
Let
s be a
file_status,
determined as if by
status(p) or
status(p, ec), respectively
.Effects: The signature with argument
ec calls
ec.clear()
if
status_known(s).