Function gio_2_0_sys::g_file_copy_async

pub unsafe extern "C" fn g_file_copy_async(
    source: *mut GFile, 
    destination: *mut GFile, 
    flags: GFileCopyFlags, 
    io_priority: gint, 
    cancellable: *mut GCancellable, 
    progress_callback: Option<GFileProgressCallback>, 
    progress_callback_data: gpointer, 
    callback: Option<GAsyncReadyCallback>, 
    user_data: gpointer
)