Function gdk4_sys::gdk_content_serialize_async

pub unsafe extern "C" fn gdk_content_serialize_async(
    stream: *mut GOutputStream, 
    mime_type: *const c_char, 
    value: *const GValue, 
    io_priority: c_int, 
    cancellable: *mut GCancellable, 
    callback: GAsyncReadyCallback, 
    user_data: gpointer
)