LibTest/typed_data/Float64List/Float64List.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
/// Float64List.view(
///     ByteBuffer buffer, [
///     int byteOffset = 0,
///     int length
/// ])
/// Creates an [Float64List] 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 Float64List.fromList(array);
  var byteBuffer = tmp.buffer;
  var l = new Float64List.view(byteBuffer, offset, length);
  Expect.equals(length, l.length);
  for (int i = 0; i < l.length; ++i) {
    Expect.equals(tmp[offset ~/ Float64List.bytesPerElement + i], l[i]);
  }
}

main() {
  check([], 0, 0);
  check([1.0], 0, 1);
  check([1.7976931348623157e308, 4.9e-324], 0, 2);
  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
  ], 40, 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
  ], 136, 1);
}