LibTest/typed_data/Float64x2List/where_A02_t01.dart

// 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))
 * ...
 * As long as the returned Iterable is not iterated over, the supplied function
 * test will not be invoked.
 * @description Checks that as long as the returned Iterable is not iterated
 * over, the supplied function test will not be invoked.
 * @author ngl@unipro.ru
 */

import "dart:typed_data";
import "../../../Utils/expect.dart";

Float64x2 f64x2(v) => new Float64x2.splat(v);

main() {
  var l = new Float64x2List.fromList([f64x2(6.0), f64x2(1.0), f64x2(4.0)]);
  var counter = 0;
  test(e) {
    counter++;
    return true;
  }
  var res = l.where(test);
  Expect.equals(0, counter);

  res.elementAt(0);
  Expect.equals(1, counter);
}