LibTest/typed_data/Float32List/Float32List.view_A01_t02.dart

// Copyright (c) 2013, 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
 * Float32List.view(
 *     ByteBuffer buffer, [
 *     int byteOffset = 0, int length
 * ])
 * Creates a [Float32List] view of the specified region in buffer.
 * @description Checks that a new instance has the same elements as the
 * specified region.
 * @author msyabro
 */

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

check(List<double> array, int offset, int length) {
  var tmp = new Float32List.fromList(array);
  var byteBuffer = tmp.buffer;
  var l = new Float32List.view(byteBuffer, offset, length);
  Expect.equals(length, l.length);
  for (int i = 0; i < l.length; ++i) {
    Expect.equals(tmp[offset ~/ Float32List.bytesPerElement + i], l[i]);
  }
}

main() {
  check([], 0, 0);
  check([1.0], 0, 1);
  check([3.4028234663852886e38, 1.401298464324817e-45, 1.1754943508222875e-38],
      0, 3);
  check([1000.0, 1000.0, 1000.0], 0, 3);
  check([
    0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0,
    13.0, 14.0, 15.0, 16.0, 17.0
  ], 0, 18);
  check([
    0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0,
    13.0, 14.0, 15.0, 16.0, 17.0
  ], 20, 13);
  check([
    0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0,
    13.0, 14.0, 15.0, 16.0, 17.0
  ], 68, 1);
}