LibTest/typed_data/Float64x2List/takeWhile_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.

// @dart = 2.9

/// @assertion Iterable<E> takeWhile(bool test(E value))
/// ...
/// The filtering happens lazily.
/// @description Checks that the filtering happens lazily. Function test is
/// called when elements are iterated.
/// @author ngl@unipro.ru


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

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

main() {
  List<Float64x2> list = [
    f64x2(1.0), f64x2(2.0), f64x2(3.0), f64x2(4.0), f64x2(5.0), f64x2(6.0)
  ];
  var l = new Float64x2List.fromList(list);
  var counter = 0;
  bool test(e) {
    counter++;
    return true;
  }
  var res = l.takeWhile(test);
  Expect.equals(0, counter);
  res.elementAt(0);
  Expect.equals(1, counter);
}