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Unified Diff: sdk/lib/async/stream_impl.dart

Issue 1177343004: Add Stream.empty. (Closed) Base URL: https://github.com/dart-lang/sdk.git@master
Patch Set: Add test, fix impl. Created 5 years, 6 months ago
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« sdk/lib/async/stream.dart ('K') | « sdk/lib/async/stream_controller.dart ('k') | tests/lib/async/stream_empty_test.dart » ('j') | tests/lib/async/stream_empty_test.dart » ('J')
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Index: sdk/lib/async/stream_impl.dart
diff --git a/sdk/lib/async/stream_impl.dart b/sdk/lib/async/stream_impl.dart
index 3f77294619a6e3d3b1e23f7794fc6b51e8700e95..19bdb699a91f77a9d268a77c4a4a9de164069b64 100644
--- a/sdk/lib/async/stream_impl.dart
+++ b/sdk/lib/async/stream_impl.dart
@@ -1081,3 +1081,15 @@ class _StreamIteratorImpl<T> implements StreamIterator<T> {
_state = _STATE_EXTRA_DONE;
}
}
+
+/** An empty broadcast stream, sending a done event as soon as possible. */
+class _EmptyStream<T> extends Stream<T> {
+ const _EmptyStream() : super._internal();
+ bool get isBroadcast => true;
+ StreamSubscription<T> listen(void onData(T data),
+ {Function onError,
+ void onDone(),
+ bool cancelOnError}) {
+ return new _DoneStreamSubscription<T>(onDone);
+ }
+}
« sdk/lib/async/stream.dart ('K') | « sdk/lib/async/stream_controller.dart ('k') | tests/lib/async/stream_empty_test.dart » ('j') | tests/lib/async/stream_empty_test.dart » ('J')

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