Function gtk_sys::gtk_cell_area_get_preferred_width

pub unsafe extern "C" fn gtk_cell_area_get_preferred_width(
    area: *mut GtkCellArea, 
    context: *mut GtkCellAreaContext, 
    widget: *mut GtkWidget, 
    minimum_width: *mut c_int, 
    natural_width: *mut c_int
)