| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// @assertion Iterable<T> expand<T>(Iterable<T> f(E element)) |
| /// ... |
| /// The returned Iterable is lazy, and calls f for each element of this every |
| /// time it's iterated. |
| /// @description Checks that the returned iterator is lazy, and calls f for each |
| /// element of this every time it's iterated |
| /// @author ngl@unipro.ru |
| |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| Int32x4 i32x4p(n) => new Int32x4(n, n + 1, n + 2, n + 3); |
| |
| equal(o1, o2) => o1.x == o2.x && o1.y == o2.y && o1.z == o2.z && o1.w == o2.w; |
| |
| void check(list) { |
| var l = new Int32x4List.fromList(list); |
| var counter = 0; |
| |
| var res = l.expand((e) {counter++; return [e + i32x4p(2)];}); |
| Expect.equals(0, counter); |
| Expect.equals(l.length, res.length); |
| Expect.equals(l.length, counter); |
| for (int i = 0; i < l.length; ++i) { |
| counter = 0; |
| Expect.isTrue(equal(l[i] + i32x4p(2), res.elementAt(i))); |
| Expect.equals(i + 1, counter); |
| } |
| } |
| |
| main() { |
| check([i32x4p(1)]); |
| check([i32x4p(1), i32x4p(5), i32x4p(9), i32x4p(13)]); |
| check([ |
| i32x4p(0), i32x4p(1), i32x4p(2), i32x4p(3), i32x4p(4), i32x4p(5), i32x4p(6), |
| i32x4p(7), i32x4p(8), i32x4p(9)] |
| ); |
| } |