blob: db4b178558d8e50ae4f94998a453563f23266636 [file] [log] [blame]
// 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 Future cancel()
/// Cancels the stream iterator (and the underlying stream subscription) early.
/// The stream iterator is automatically canceled if the moveNext future
/// completes with either false or an error.
/// If you need to stop listening for values before the stream iterator is
/// automatically closed, you must call cancel to ensure that the stream is
/// properly closed.
/// If moveNext has been called when the iterator is cancelled, its returned
/// future will complete with false as value, as will all further calls to
/// moveNext.
/// Returns a future if the cancel-operation is not completed synchronously.
/// Otherwise returns null.
/// @description Checks that call to cancel() completes with false future
/// returned by moveNext(), that was called prior cancel().
/// @author
import "dart:async";
import "../../../Utils/expect.dart";
main() {
StreamController controller = new StreamController();
StreamIterator streamIterator = new StreamIterator(;
streamIterator.moveNext().then((value) {