addStream method
override
Adds all elements of the given stream
.
Returns a Future that completes when all elements of the given stream
have been added.
If the stream contains an error, the addStream
ends at the error, and the returned future completes with that error.
This function must not be called when a stream is currently being added using this function.
Implementation
Future addStream(Stream<List<int>> stream);
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https://api.dart.dev/stable/2.13.0/dart-io/IOSink/addStream.html