pub unsafe extern "C" fn proj_get_area_of_use( ctx: *mut PJ_CONTEXT, obj: *const PJ, out_west_lon_degree: *mut f64, out_south_lat_degree: *mut f64, out_east_lon_degree: *mut f64, out_north_lat_degree: *mut f64, out_area_name: *mut *const c_char) -> c_int