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