#compound-types #scala
what the type of the parameter obj is. If it’s Cloneable then the object can be cloned, but not reset; if it’s Resetable we can reset it, but there is no clone operation. To avoid type casts in such a situation, we can specify the type of obj to be both Cloneable and Resetable. This compound type is written like this in Scala: Cloneable with Resetable.
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Compound Types - Scala Documentation Unit
}
Now suppose we want to write a function cloneAndReset which takes an object, clones it and resets the original object:
def cloneAndReset(obj: ?): Cloneable = {
val cloned = obj.clone()
obj.reset
cloned
}
The question arises <span>what the type of the parameter obj is. If it’s Cloneable then the object can be cloned, but not reset; if it’s Resetable we can reset it, but there is no clone operation. To avoid type casts in such a situation, we can specify the type of obj to be both Cloneable and Resetable. This compound type is written like this in Scala: Cloneable with Resetable.
Here’s the updated function:
def cloneAndReset(obj: Cloneable with Resetable): Cloneable = {
//...
}
Compound types can consist of several object types and they may have a single re Summary
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