| // 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<E> where(bool test(E element)) |
| /// ... |
| /// Iterating will not cache results, and thus iterating multiple times over the |
| /// returned Iterable may invoke the supplied function test multiple times on the |
| /// same element. |
| /// @description Checks that iterating multiple times over the returned Iterable |
| /// may invoke the supplied function test multiple times on the same element. |
| /// @author ngl@unipro.ru |
| |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| Int32x4 i32x4(n) => new Int32x4(n, n, n, n); |
| |
| equal(o1, o2) => o1.x == o2.x && o1.y == o2.y && o1.z == o2.z && o1.w == o2.w; |
| |
| main() { |
| var counter = 0; |
| bool test(e) { |
| counter++; |
| return e.x < 5; |
| } |
| var list = [i32x4(0), i32x4(1), i32x4(2), i32x4(6), i32x4(4), i32x4(5)]; |
| var l = new Int32x4List.fromList(list); |
| |
| var res = l.where(test); |
| Expect.equals(0, counter); |
| res.elementAt(0); |
| Expect.equals(1, counter); |
| res.elementAt(1); |
| Expect.equals(3, counter); |
| res.elementAt(0); |
| Expect.equals(4, counter); |
| res.elementAt(3); |
| Expect.equals(9, counter); |
| |
| var it1 = res.iterator; |
| var it2 = res.iterator; |
| counter = 0; |
| |
| it1.moveNext(); |
| Expect.equals(1, counter); |
| it1.moveNext(); |
| Expect.equals(2, counter); |
| it2.moveNext(); |
| Expect.equals(3, counter); |
| } |