Implicit String conversion in scala doesnt compile

Question

I've attempted to implement an implicit string conversion, as an experiment with creating scala object "factories", for example, in this case, I'd like to create an employee object from a string.

implicit def s2act(name: String) = new Actor[Employee](){
  override def toString() : String = {
    name
  }
};
//two failed attempts at leveraging the implicit conversion below...
processActor("jim")
def boss : Actor = new String("Jim");

However, the above implicit binding fails to be identified by the compiler. Why does the compiler fail to process this implicit binding?

faissalb · Accepted Answer · 2014-08-10 03:48:37Z

2

It seems to me that the error you should get from your code is that "class Actor takes type parameters".

a more correct code will be :

def boss : Actor[Employee] = new String("Jim");

answered Aug 10, 2014 at 3:48

faissalb

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Community · Accepted Answer · 2017-05-23 11:57:11Z

1

I don't know what's the signature of processActor, but judging from the signature of boss I think the problem is you don't provide type parameter to Actor.

Actor itself is a type constructor, which means that it takes a type to construct a new type.

Actor is not a type, and you cannot use it in your function/method signature, but Actor[Employee] is a type.

Change your boss to this

def boss: Actor[Employee] = new String("Jim")

Related post: What is a higher kinded type in Scala?

edited May 23, 2017 at 11:57

CommunityBot

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answered Aug 10, 2014 at 3:48

Herrington Darkholme

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