std::filesystem::directory_entry::refresh (3) - Linux Manuals

std::filesystem::directory_entry::refresh: std::filesystem::directory_entry::refresh

NAME

std::filesystem::directory_entry::refresh - std::filesystem::directory_entry::refresh

Synopsis


void refresh(); (since C++17)
void refresh( std::error_code& ec ) noexcept;


Examines the filesystem object referred to by this directory entry and stores its attributes for retrieval with status(), exists(), is_regular_file(), and other status accessors.
If an error occurs, the value of any cached attributes is unspecified

Parameters


ec - out-parameter for error reporting in the non-throwing overload

Return value


(none)

Exceptions


The overload that does not take a std::error_code& parameter throws filesystem_error on underlying OS API errors, constructed with p as the first path argument and the OS error code as the error code argument. The overload taking a std::error_code& parameter sets it to the OS API error code if an OS API call fails, and executes ec.clear() if no errors occur. Any overload not marked noexcept may throw std::bad_alloc if memory allocation fails.

Notes


Many low-level OS APIs for directory traversal retrieve file attributes along with the next directory entry. The constructors and the non-const member functions of directory_iterator store these attributes, if any, in the pointed-to directory_entry without calling directory_entry::refresh, which makes it possible to examine the attributes of the directory entries as they are being iterated over, without making additional system calls.

Example


 This section is incomplete
 Reason: no example

See also


                  status of the file designated by this directory entry
status symlink_status of the file designated by this directory entry
symlink_status (public member function)
                  checks whether directory entry refers to existing file system object
exists (public member function)
                  checks whether the directory entry refers to block device
is_block_file (public member function)
                  checks whether the directory entry refers to a character device
is_character_file (public member function)
                  checks whether the directory entry refers to a directory
is_directory (public member function)
                  checks whether the directory entry refers to a named pipe
is_fifo (public member function)
                  checks whether the directory entry refers to an other file
is_other (public member function)
                  checks whether the directory entry refers to a regular file
is_regular_file (public member function)
                  checks whether the directory entry refers to a named IPC socket
is_socket (public member function)
                  checks whether the directory entry refers to a symbolic link
is_symlink (public member function)
                  returns the size of the file to which the directory entry refers
file_size (public member function)
                  returns the number of hard links referring to the file to which the directory entry refers
hard_link_count (public member function)
                  gets or sets the time of the last data modification of the file to which the directory entry refers
last_write_time (public member function)