OpenEuphoria

I tried to write some function similar to xcopy using the walk_dir() routine, but I needed to supply the "your_function" with an additional data such as destination directory, overwriting flag etc.

So I looked to the walk_dir() code and found that the routine already has such functionality:

public function walk_dir(sequence path_name, object your_function, integer scan_subdirs = types:FALSE, 
                         object dir_source = types:NO_ROUTINE_ID) 
    -- snip 
    if sequence(your_function) then 
        user_data = append(user_data, your_function[2]) 
        your_function = your_function[1] 
    end if 
    -- snip 
        abort_now = call_func(your_function, user_data) 
    -- snip 
end function 

It would be nice if this useful feature was documented.