SubSource$

java.lang.Object
- akka.stream.javadsl.SubSource$

```
public class SubSource$
extends java.lang.Object
```
* Upcast a stream of elements to a stream of supertypes of that element. Useful in combination with fan-in operators where you do not want to pay the cost of casting each element in a map.

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static SubSource$ MODULE$
  Static reference to the singleton instance of this Scala object.
- Constructor Summary
  
  Constructors
  Constructor Description
  
  SubSource$()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  <U,T extends U,Mat> SubSource<U,Mat> upcast(SubSource<T,Mat> source)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- MODULE$
```
public static final SubSource$ MODULE$
```
  Static reference to the singleton instance of this Scala object.

Constructor Detail
- SubSource$
```
public SubSource$()
```

Method Detail

upcast

public <U,T extends U,Mat> SubSource<U,Mat> upcast(SubSource<T,Mat> source)