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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/filesystem/directory_entry/refresh.html below:

std::filesystem::directory_entry::refresh - cppreference.com

void refresh();

(1) (since C++17) (2) (since C++17)

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.

[edit] Parameters ec - out-parameter for error reporting in the non-throwing overload [edit] Return value

(none)

[edit] Exceptions

Any overload not marked noexcept may throw std::bad_alloc if memory allocation fails.

1)

Throws

std::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.

2)

Sets a

std::error_code&

parameter to the OS API error code if an OS API call fails, and executes

ec.clear()

if no errors occur.

[edit] 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.

[edit] Example [edit] See also status of the file designated by this directory entry;
status of the file/symlink designated by this directory entry
(public member function) [edit] checks whether directory entry refers to existing file system object
(public member function) [edit] checks whether the directory entry refers to block device
(public member function) [edit] checks whether the directory entry refers to a character device
(public member function) [edit] checks whether the directory entry refers to a directory
(public member function) [edit] checks whether the directory entry refers to a named pipe
(public member function) [edit] checks whether the directory entry refers to an other file
(public member function) [edit] checks whether the directory entry refers to a regular file
(public member function) [edit] checks whether the directory entry refers to a named IPC socket
(public member function) [edit] checks whether the directory entry refers to a symbolic link
(public member function) [edit] returns the size of the file to which the directory entry refers
(public member function) [edit] returns the number of hard links referring to the file to which the directory entry refers
(public member function) [edit] gets the time of the last data modification of the file to which the directory entry refers
(public member function) [edit]

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