Function view_with_negative_strides

src/borrow/shared.rs:694–723

()

    #[test]
    fn view_with_negative_strides() {
        Python::attach(|py| {
            let array = PyArray::<f64, _>::zeros(py, (1, 2, 3), false);

            let locals = [("array", &array)].into_py_dict(py).unwrap();
            let view = py
                .eval(c_str!("array[::-1,:,::-1]"), None, Some(&locals))
                .unwrap()
                .cast_into::<PyArray3<f64>>()
                .unwrap();
            assert_ne!(
                view.as_ptr().cast::<c_void>(),
                array.as_ptr().cast::<c_void>()
            );

            let base = unsafe { (*view.as_array_ptr()).base };
            assert_eq!(base.cast::<c_void>(), array.as_ptr().cast::<c_void>());

            let base_address = base_address(py, view.as_array_ptr());
            assert_ne!(base_address, view.as_ptr().cast::<c_void>());
            assert_eq!(base_address, base.cast::<c_void>());

            let data_range = data_range(py, view.as_array_ptr());
            assert_eq!(view.data(), unsafe { array.data().offset(2) });
            assert_eq!(data_range.0, unsafe { view.data().offset(-2) }
                as *mut c_char);
            assert_eq!(data_range.1, unsafe { view.data().offset(4) }
                as *mut c_char);
        });
    }

    #[test]
    fn array_with_zero_dimensions() {