Adapts source
to be a StreamTransformer<TS, TT>
.
This allows source
to be used at the new type, but at run-time it must satisfy the requirements of both the new type and its original type.
Data events passed into the returned transformer must also be instances of SS
, and data events produced by source
for those events must also be instances of TT
.
static StreamTransformer<TS, TT> castFrom<SS, ST, TS, TT>( StreamTransformer<SS, ST> source) { return new CastStreamTransformer<SS, ST, TS, TT>(source); }
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-async/StreamTransformer/castFrom.html